{"id":15996,"date":"2026-08-21T18:06:31","date_gmt":"2026-08-21T10:06:31","guid":{"rendered":"https:\/\/www.drillpipes.com\/%d0%ba%d0%b0%d0%ba%d0%b8%d0%b5-the-%d0%be%d1%81%d0%bd%d0%be%d0%b2%d0%bd%d0%be%d0%b9-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-%d1%82%d0%b8%d0%bf-%d1%80\/"},"modified":"2026-09-18T16:19:02","modified_gmt":"2026-09-18T08:19:02","slug":"%d0%ba%d0%b0%d0%ba%d0%b8%d0%b5-the-%d0%be%d1%81%d0%bd%d0%be%d0%b2%d0%bd%d0%be%d0%b9-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-%d1%82%d0%b8%d0%bf-%d1%80","status":"publish","type":"post","link":"https:\/\/www.drillpipes.com\/ru\/%d0%ba%d0%b0%d0%ba%d0%b8%d0%b5-the-%d0%be%d1%81%d0%bd%d0%be%d0%b2%d0%bd%d0%be%d0%b9-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-%d1%82%d0%b8%d0%bf-%d1%80\/","title":{"rendered":"\u043a\u0430\u043a\u0438\u0435 the \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0442\u0438\u043f \u0440\u0435\u0437\u044c\u0431\u044bs?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Drill Pipe Thread Types<\/strong>\u00a0refer to the standardized thread designs machined on oilfield drill pipe tool joints to connect individual drill pipe sections into a complete drill string. These thread types define how the external <strong>pin connection<\/strong>\u00a0and internal <strong>box connection<\/strong>\u00a0engage with each other, allowing drill pipes to transmit rotation, withstand axial loads, and maintain structural integrity during drilling operations.<\/p>\n\n<p class=\"wp-block-paragraph\">Unlike conventional \u0442\u0440\u0443\u0431\u0430 \u0440\u0435\u0437\u044c\u0431\u0430s \u0431\/\u0443 in general pi\u0448\u0435\u0439\u043a\u0430g systems, <strong>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/strong>\u00a0are designed as <strong>rotary shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s (RSC)<\/strong>. The \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 system iNCludes the \u0440\u0435\u0437\u044c\u0431\u0430 profile, shoulder surface, \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u0435ing area, and controlled dimensions of the \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435. These elements work together to transfer \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 from the surface equipment to the \u0434\u043e\u043b\u043e\u0442\u043e while resisting repeated make-up and break-out cycles under complex downhole loading conditions.<\/p>\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-523715a8 wp-block-columns-is-layout-flex\" style=\"margin-top:0;margin-bottom:0;padding-top:0;padding-right:0;padding-bottom:0;padding-left:0\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Precision-machined-drill-pipe-tool-joint-components-with-threaded-connections-for-oilfield-drilling-applications-1024x768.png\" alt=\"\" class=\"wp-image-14507\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Precision-machined-drill-pipe-tool-joint-components-with-threaded-connections-for-oilfield-drilling-applications-1024x768.png 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Precision-machined-drill-pipe-tool-joint-components-with-threaded-connections-for-oilfield-drilling-applications-300x225.png 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Precision-machined-drill-pipe-tool-joint-components-with-threaded-connections-for-oilfield-drilling-applications.png 1448w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill-pipe-tool-joint-threads-after-precision-machining-for-rotary-shouldered-connections-1024x768.png\" alt=\"\" class=\"wp-image-14508\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill-pipe-tool-joint-threads-after-precision-machining-for-rotary-shouldered-connections-1024x768.png 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill-pipe-tool-joint-threads-after-precision-machining-for-rotary-shouldered-connections-300x225.png 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill-pipe-tool-joint-threads-after-precision-machining-for-rotary-shouldered-connections.png 1448w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n<\/div>\n\n<p class=\"wp-block-paragraph\">The commonly recognized API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 families iNClude <strong>REG (Regular), IF (Internal Flush), FH (Full Hole), and NC (Numbered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435)<\/strong>. Modern \u0431\u0443\u0440\u0435\u043d\u0438\u0435 operations may also use \u043f\u0440\u0435\u043c\u0438\u0443\u043c \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s with enhaNCed shoulder designs and higher \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 capacity for demanding \u0431\u0443\u0440\u0435\u043d\u0438\u0435 environments.<\/p>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill-pipe-connection-structure-showing-pin-box-shoulder-and-thread-profile-of-rotary-shouldered-connection-1024x576.png\" alt=\"\" class=\"wp-image-14497\" style=\"aspect-ratio:1.7777988769226596;width:1046px;height:auto\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill-pipe-connection-structure-showing-pin-box-shoulder-and-thread-profile-of-rotary-shouldered-connection-1024x576.png 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill-pipe-connection-structure-showing-pin-box-shoulder-and-thread-profile-of-rotary-shouldered-connection-300x169.png 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill-pipe-connection-structure-showing-pin-box-shoulder-and-thread-profile-of-rotary-shouldered-connection.png 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\"><strong>Drill Pipe Connection Structure and Operating Function<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s are \u0440\u0435\u0437\u044c\u0431\u0430ed rotary-shouldered joints located at both ends of the \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, allowing individual \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 sections to be assembled into a complete \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430. The \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 transfers \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, supports axial loads and \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439tains mechanical integrity during repeated make-up, \u0431\u0443\u0440\u0435\u043d\u0438\u0435 and break-out operations.<\/p>\n\n<p class=\"wp-block-paragraph\">A \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 is not only a \u0440\u0435\u0437\u044c\u0431\u0430ed interface. Its \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c depends on the interaction \u043c\u0435\u0436\u0434\u0443 the \u0448\u0435\u0439\u043a\u0430, \u043c\u0430\u0442\u043a\u0430, shoulder, \u0440\u0435\u0437\u044c\u0431\u0430 profile and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions. These components work together to achieve proper load transfer, \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u0435ing \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c resistaNCe under \u0431\u0443\u0440\u0435\u043d\u0438\u0435 conditions.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Connection Component<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Engineering Function<\/strong><strong><\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0448\u0435\u0439\u043a\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><td class=\"has-text-align-center\" data-align=\"center\">External \u0440\u0435\u0437\u044c\u0431\u0430ed section that enters the \u043c\u0430\u0442\u043a\u0430 and provides mechanical engagement<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u043c\u0430\u0442\u043a\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><td class=\"has-text-align-center\" data-align=\"center\">Internal \u0440\u0435\u0437\u044c\u0431\u0430ed section that receives the \u0448\u0435\u0439\u043a\u0430 and transfers applied loads<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Shoulder surface<\/td><td class=\"has-text-align-center\" data-align=\"center\">Metal-to-metal contact area that transfers make-up \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and stabilizes the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0440\u0435\u0437\u044c\u0431\u0430 profile<\/td><td class=\"has-text-align-center\" data-align=\"center\">Controls engagement strength, load distribution and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439tains manufacturing accuracy, co\u041c\u041f\u0430tibility and field interchangeability<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h3 class=\"wp-block-heading\"><strong>Connection Loads During Drilling Operations<\/strong><strong><\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\">During \u0431\u0443\u0440\u0435\u043d\u0438\u0435, the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 transfers \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 from the surface drive system to the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 while supporting tensile, bending and pressure loads generated during operation. The \u0440\u0435\u0437\u044c\u0431\u0430 profile, shoulder contact and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry must work together to \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439tain load distribution and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 integrity.<\/p>\n\n<p class=\"wp-block-paragraph\">Rotational \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 determines the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435\u2019s ability to transmit \u0431\u0443\u0440\u0435\u043d\u0438\u0435 power without excessive stress. Tensile loading from the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441 affects \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 strength requirements, while bending stress during directional \u0431\u0443\u0440\u0435\u043d\u0438\u0435 iNCreases \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c exposure. Internal and external pressure conditions also require reliable \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u0435ing \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c throughout \u0431\u0443\u0440\u0435\u043d\u0438\u0435 cycles.<\/p>\n\n<p class=\"wp-block-paragraph\">Because these loads act simultaneously, \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s should be \u0432\u044b\u0431\u0440\u0430\u0442\u044ced based on the complete \u0431\u0443\u0440\u0435\u043d\u0438\u0435 environment, iNCluding \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 trajectory, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 requirements, operating conditions and expected service lIFe.<\/p>\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill_Pipe_Connection_Diagrams_Rebuilt-2.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 Drill_Pipe_Connection_Diagrams_\"><\/object><a id=\"wp-block-file--media-f1b2dd2e-2a34-4050-b7ec-e62d76cc0e02\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill_Pipe_Connection_Diagrams_Rebuilt-2.pdf\">\u0431\u0443\u0440_\u0442\u0440\u0443\u0431\u0430_\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435_Diagrams_<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Drill_Pipe_Connection_Diagrams_Rebuilt-2.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-f1b2dd2e-2a34-4050-b7ec-e62d76cc0e02\">Download<\/a><\/div>\n\n<h2 class=\"wp-block-heading\"><strong>How Are Oilfield Drill Pipe Thread Types Classified?<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">\u043d\u0435\u0444\u0442\u044cfield <strong>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0442\u0438\u043f \u0440\u0435\u0437\u044c\u0431\u044bs<\/strong>\u00a0are \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439ly classIFied according to their \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 design, load capability, and \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435 requirements. Most \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430s use <strong><a href=\"__PROTECTED_0__\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-secondary-color\">rotary shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/mark><\/a> (RSC)<\/strong>, where the \u0440\u0435\u0437\u044c\u0431\u0430ed \u0448\u0435\u0439\u043a\u0430 and \u043c\u0430\u0442\u043a\u0430 sections work together with the shoulder surface to transfer \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439tain \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 strength during operation.<\/p>\n\n<p class=\"wp-block-paragraph\">The \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 categories iNClude <strong>API standard \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/strong>\u00a0and <strong>\u043f\u0440\u0435\u043c\u0438\u0443\u043c \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/strong>. API standard \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s such as <strong>REG, IF, FH, and NC<\/strong>\u00a0are widely \u0431\/\u0443 because their \u0440\u0435\u0437\u044c\u0431\u0430 profiles and dimensions are defined by industry specIFications, allowing manufacturers and \u0431\u0443\u0440\u0435\u043d\u0438\u0435 contractors to \u0432\u044b\u0431\u0440\u0430\u0442\u044c co\u041c\u041f\u0430tible \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 components. \u043f\u0440\u0435\u043c\u0438\u0443\u043c \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s use modIFied \u0440\u0435\u0437\u044c\u0431\u0430 and shoulder designs to achieve higher \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 capacity, improved \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c resistaNCe, or \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c requirements for more demanding \u0431\u0443\u0440\u0435\u043d\u0438\u0435 conditions.<\/p>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"481\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Classification-of-API-drill-pipe-thread-types-and-premium-rotary-shouldered-connections-e1787297972582-1024x481.png\" alt=\"\" class=\"wp-image-14505\" style=\"width:1086px;height:auto\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Classification-of-API-drill-pipe-thread-types-and-premium-rotary-shouldered-connections-e1787297972582-1024x481.png 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Classification-of-API-drill-pipe-thread-types-and-premium-rotary-shouldered-connections-e1787297972582-300x141.png 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Classification-of-API-drill-pipe-thread-types-and-premium-rotary-shouldered-connections-e1787297972582-768x361.png 768w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Classification-of-API-drill-pipe-thread-types-and-premium-rotary-shouldered-connections-e1787297972582-1536x722.png 1536w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Classification-of-API-drill-pipe-thread-types-and-premium-rotary-shouldered-connections-e1787297972582.png 1586w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Connection Category<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Typical Types<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Engineering Characteristics<\/strong><strong><\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>API Standard Connections<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">REG, IF, FH, NC<\/td><td class=\"has-text-align-center\" data-align=\"center\">Standard rotary shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s with defined \u0440\u0435\u0437\u044c\u0431\u0430 geometry, \u0431\/\u0443 for common \u043d\u0435\u0444\u0442\u044cfield \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435s and co\u041c\u041f\u0430tible \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 designs<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Premium Connections<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0434\u0432\u043e\u0439\u043d\u043e\u0439 shoulder and proprietary designs<\/td><td class=\"has-text-align-center\" data-align=\"center\">Optimized \u0440\u0435\u0437\u044c\u0431\u0430 and shoulder structures for higher \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transmission, improved \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c, and specIFic \u0431\u0443\u0440\u0435\u043d\u0438\u0435 environments<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">For all \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 types, \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c depends on more than the \u0440\u0435\u0437\u044c\u0431\u0430 name. The actual capability is determined by the complete \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 design, iNCluding <strong>\u0448\u0435\u0439\u043a\u0430 and \u043c\u0430\u0442\u043a\u0430 geometry, shoulder contact, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions, \u0440\u0435\u0437\u044c\u0431\u0430 accuracy, and inspection control<\/strong>.<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>API Drill Pipe Connection Types and Design Characteristics<\/strong><\/h2>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"518\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/REG-IF-FH-and-NC-drill-pipe-connection-profile-comparison-e1787298263151-1024x518.png\" alt=\"\" class=\"wp-image-14506\" style=\"aspect-ratio:1.6677694363150528;width:1093px;height:auto\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/REG-IF-FH-and-NC-drill-pipe-connection-profile-comparison-e1787298263151-1024x518.png 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/REG-IF-FH-and-NC-drill-pipe-connection-profile-comparison-e1787298263151-300x152.png 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/REG-IF-FH-and-NC-drill-pipe-connection-profile-comparison-e1787298263151-768x388.png 768w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/REG-IF-FH-and-NC-drill-pipe-connection-profile-comparison-e1787298263151-1536x776.png 1536w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/REG-IF-FH-and-NC-drill-pipe-connection-profile-comparison-e1787298263151.png 1563w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\"><strong>REG Thread (Regular Connection)<\/strong><strong><\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>REG thread<\/strong> is one of the earlier API drill pipe connection designs developed for rotary drilling applications.<\/p>\n\n<p class=\"wp-block-paragraph\">The REG \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 uses a traditional \u0440\u0435\u0437\u044c\u0431\u0430 profile with strong mechanical engagement. Co\u041c\u041f\u0430red with later flush-type designs, REG \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s generally have greater internal restriction because of their \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry.<\/p>\n\n<p class=\"wp-block-paragraph\">\u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 characteristics iNClude:<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Feature<\/th><th class=\"has-text-align-center\" data-align=\"center\">Description<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 type<\/td><td class=\"has-text-align-center\" data-align=\"center\">API rotary shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Design focus<\/td><td class=\"has-text-align-center\" data-align=\"center\">Mechanical strength and durability<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Hydraulic behavior<\/td><td class=\"has-text-align-center\" data-align=\"center\">More internal restriction co\u041c\u041f\u0430red with flush designs<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435<\/td><td class=\"has-text-align-center\" data-align=\"center\">Conventional \u0431\u0443\u0440\u0435\u043d\u0438\u0435 operations<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">REG \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s re\u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 recognized within the \u043d\u0435\u0444\u0442\u044cfield industry, especially when replacing existing \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 components where \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 co\u041c\u041f\u0430tibility is required.<\/p>\n\n<h2 class=\"wp-block-heading\">IF \u0440\u0435\u0437\u044c\u0431\u0430 (Internal Flush \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435)<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>IF thread (Internal Flush connection)<\/strong> was developed to improve internal flow characteristics by reducing the internal restriction created by the tool joint connection.<\/p>\n\n<p class=\"wp-block-paragraph\">The internal profile provides a smoother transition \u043c\u0435\u0436\u0434\u0443 the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 bore and the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 area, which can help reduce pressure losses in the circulating system.<\/p>\n\n<p class=\"wp-block-paragraph\">Important characteristics iNClude:<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Feature<\/th><th class=\"has-text-align-center\" data-align=\"center\">Description<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 name<\/td><td class=\"has-text-align-center\" data-align=\"center\">Internal Flush<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 purpose<\/td><td class=\"has-text-align-center\" data-align=\"center\">Improve internal hydraulic flow area<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Engineering consideration<\/td><td class=\"has-text-align-center\" data-align=\"center\">BalaNCe flow efficieNCy with \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 strength<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435<\/td><td class=\"has-text-align-center\" data-align=\"center\">Conventional \u043d\u0435\u0444\u0442\u044cfield \u0431\u0443\u0440\u0435\u043d\u0438\u0435<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">When evaluating an IF \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, engineers must consider more than the \u0440\u0435\u0437\u044c\u0431\u0430 name. \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043d\u0430\u0440\u0443\u0436\u043d\u044b\u0439 \u0434\u0438\u0430\u043c\u0435\u0442\u0440, \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0438\u0439 \u0434\u0438\u0430\u043c\u0435\u0442\u0440, shoulder design, and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 condition all affect actual \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c.<\/p>\n\n<h2 class=\"wp-block-heading\">FH \u0440\u0435\u0437\u044c\u0431\u0430 (Full Hole \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435)<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>FH thread (Full Hole connection)<\/strong> is an API rotary shouldered connection historically used in drill string applications.<\/p>\n\n<p class=\"wp-block-paragraph\">The design provides a relatively larger internal passage co\u041c\u041f\u0430red with some earlier \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 designs, reducing flow restriction through the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 area.<\/p>\n\n<div class=\"wp-block-media-text is-stacked-on-mobile\" style=\"grid-template-columns:39% auto\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"606\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/FH-Thread-Full-Hole-Connection-e1787296808869-1024x606.png\" alt=\"\" class=\"wp-image-14502 size-full\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/FH-Thread-Full-Hole-Connection-e1787296808869-1024x606.png 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/FH-Thread-Full-Hole-Connection-e1787296808869-300x178.png 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/FH-Thread-Full-Hole-Connection-e1787296808869-768x455.png 768w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/FH-Thread-Full-Hole-Connection-e1787296808869.png 1412w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p class=\"wp-block-paragraph\">\u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 characteristics:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Larger internal opening co\u041c\u041f\u0430red with traditional restricted designs<\/li>\n\n\n\n<li>Suitable for \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435s requiring improved hydraulic \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c<\/li>\n\n\n\n<li>Part of the historical development of API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Although many modern \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430s use NC \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s, FH re\u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439s an important \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 type when discussing API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 evolution.<\/p>\n<\/div><\/div>\n\n<h2 class=\"wp-block-heading\">NC \u0440\u0435\u0437\u044c\u0431\u0430 (Numbered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435)<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>NC (Numbered Connection)<\/strong> is a standardized family of <strong>API rotary shouldered connections<\/strong> used for oilfield drill pipe applications. Unlike connection names such as REG, IF and FH that mainly describe design characteristics, NC connections are identified by numbered designations that represent different connection families.<\/p>\n\n<p class=\"wp-block-paragraph\">Common NC \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 families iNClude:<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/th><th class=\"has-text-align-center\" data-align=\"center\">General \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435 Consideration<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">NC31<\/td><td class=\"has-text-align-center\" data-align=\"center\">Smaller \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435s<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">NC38<\/td><td class=\"has-text-align-center\" data-align=\"center\">Medium-size \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435s<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">NC40<\/td><td class=\"has-text-align-center\" data-align=\"center\">General \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435s<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">NC46<\/td><td class=\"has-text-align-center\" data-align=\"center\">Larger \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 requirements<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">NC50<\/td><td class=\"has-text-align-center\" data-align=\"center\">Higher load and \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435s<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">The NC designation identIFies the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 family rather than simply indicating \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 size. \u0432\u044b\u0431\u043e\u0440 depends on the complete \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 design, iNCluding <strong>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions, \u0440\u0435\u0437\u044c\u0431\u0430 profile, shoulder configuration, \u0431\u0443\u0440\u0435\u043d\u0438\u0435 requirements and inspection control<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\">In modern \u0431\u0443\u0440\u0435\u043d\u0438\u0435 operations, NC \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s are widely \u0431\/\u0443 because their standardized geometry improves \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 co\u041c\u041f\u0430tibility and specIFication control. Larger \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 families, such as <strong>NC50<\/strong>, are commonly \u0432\u044b\u0431\u0440\u0430\u0442\u044ced for \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435s requiring higher \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 capacity and larger \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 configurations.<\/p>\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/API_Drill_Pipe_Connection_Types_and_Selection_Guide.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 API_Drill_Pipe_Connection_Types_and_Selection_Guide\"><\/object><a id=\"wp-block-file--media-ed4da7ad-d814-4632-a058-feded260f6a4\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/API_Drill_Pipe_Connection_Types_and_Selection_Guide.pdf\">API_\u0431\u0443\u0440_\u0442\u0440\u0443\u0431\u0430_\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435_Types_and_\u0432\u044b\u0431\u043e\u0440_Guide<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/API_Drill_Pipe_Connection_Types_and_Selection_Guide.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-ed4da7ad-d814-4632-a058-feded260f6a4\">Download<\/a><\/div>\n\n<h2 class=\"wp-block-heading\"><strong>What Is the Difference Between REG, IF, FH and NC Connections?<\/strong><strong><\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">DIFferent <strong>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0442\u0438\u043f \u0440\u0435\u0437\u044c\u0431\u044bs<\/strong>\u00a0were developed to address dIFferent \u0431\u0443\u0440\u0435\u043d\u0438\u0435 requirements, iNCluding \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transmission, hydraulic flow efficieNCy, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 strength, and co\u041c\u041f\u0430tibility with existing \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 components.<\/p>\n\n<p class=\"wp-block-paragraph\">Although REG, IF, FH, and NC are all <strong>rotary shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/strong>, their \u0440\u0435\u0437\u044c\u0431\u0430 geometry and internal profile are dIFferent. These \u0440\u0430\u0437\u043d\u0438\u0446\u0430s affect how the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 performs under \u0431\u0443\u0440\u0435\u043d\u0438\u0435 loads.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Connection Type<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Design Characteristics<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Engineering Performance<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Typical Selection Considerations<\/strong><strong><\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>REG (Regular Connection)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Traditional API \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 with a relatively large \u0440\u0435\u0437\u044c\u0431\u0430 engagement area and smaller internal flow passage co\u041c\u041f\u0430red with flush-type designs<\/td><td class=\"has-text-align-center\" data-align=\"center\">Provides reliable mechanical engagement and good \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 durability, but the internal restriction can iNCrease pressure loss in high-flow \u0431\u0443\u0440\u0435\u043d\u0438\u0435 systems<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0432\u044b\u0431\u0440\u0430\u0442\u044ced where existing \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 co\u041c\u041f\u0430tibility and conventional \u0431\u0443\u0440\u0435\u043d\u0438\u0435 requirements are more important than maximum hydraulic efficieNCy<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>IF (Internal Flush Connection)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Designed with a smoother internal transition \u043c\u0435\u0436\u0434\u0443 the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 bore and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><td class=\"has-text-align-center\" data-align=\"center\">Reduces internal flow restriction co\u041c\u041f\u0430red with traditional \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 designs, hel\u0448\u0435\u0439\u043a\u0430g improve \u0431\u0443\u0440\u0435\u043d\u0438\u0435 fluid circulation efficieNCy<\/td><td class=\"has-text-align-center\" data-align=\"center\">Considered when hydraulic \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c and reduced pressure loss are important factors<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>FH (Full Hole Connection)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Developed with a larger internal bore area than earlier \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 designs<\/td><td class=\"has-text-align-center\" data-align=\"center\">Provides improved internal flow capacity while \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439taining API rotary shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 characteristics<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0431\/\u0443 when larger internal flow area is required and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 co\u041c\u041f\u0430tibility is \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439tained with existing equipment<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>NC (Numbered Connection)<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Modern API numbered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 family using designations such as NC38, NC40, NC46, and NC50<\/td><td class=\"has-text-align-center\" data-align=\"center\">Provides standardized \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry with a balaNCe \u043c\u0435\u0436\u0434\u0443 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 capacity, hydraulic \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c, and interchangeability<\/td><td class=\"has-text-align-center\" data-align=\"center\">Widely \u0432\u044b\u0431\u0440\u0430\u0442\u044ced for modern \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430s because \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 size and \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c can be matched to \u0431\u0443\u0440\u0435\u043d\u0438\u0435 requirements<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"606\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Comparison-of-drill-pipe-connection-performance-factors-including-torque-hydraulic-flow-and-compatibility-e1787298570604-1024x606.png\" alt=\"\" class=\"wp-image-14509\" style=\"width:1160px;height:auto\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Comparison-of-drill-pipe-connection-performance-factors-including-torque-hydraulic-flow-and-compatibility-e1787298570604-1024x606.png 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Comparison-of-drill-pipe-connection-performance-factors-including-torque-hydraulic-flow-and-compatibility-e1787298570604-300x177.png 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Comparison-of-drill-pipe-connection-performance-factors-including-torque-hydraulic-flow-and-compatibility-e1787298570604-768x454.png 768w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Comparison-of-drill-pipe-connection-performance-factors-including-torque-hydraulic-flow-and-compatibility-e1787298570604.png 1505w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<h3 class=\"wp-block-heading\"><strong>How These Differences Affect Drill String Performance<\/strong>?<\/h3>\n\n<p class=\"wp-block-paragraph\">The \u0440\u0430\u0437\u043d\u0438\u0446\u0430s \u043c\u0435\u0436\u0434\u0443 <strong>REG, IF, FH, and NC \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/strong>\u00a0directly affect \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transfer, hydraulic \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c, and \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 co\u041c\u041f\u0430tibility. During \u0431\u0443\u0440\u0435\u043d\u0438\u0435, the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 must \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439tain reliable contact \u043c\u0435\u0436\u0434\u0443 the <strong>\u0448\u0435\u0439\u043a\u0430, \u043c\u0430\u0442\u043a\u0430, and shoulder<\/strong>\u00a0to transmit rotation and withstand repeated loading conditions.<\/p>\n\n<p class=\"wp-block-paragraph\">Larger \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 families, such as the <strong>NC50 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/strong>, are commonly \u0432\u044b\u0431\u0440\u0430\u0442\u044ced for higher \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435s because their geometry provides greater load-carrying capability. Meanwhile, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 designs with improved internal flush characteristics can reduce hydraulic restriction and support efficient \u0431\u0443\u0440\u0435\u043d\u0438\u0435 fluid circulation.<\/p>\n\n<p class=\"wp-block-paragraph\">\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0432\u044b\u0431\u043e\u0440 also depends on the complete \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 configuration, iNCluding \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430, crossover subs, heavy \u0432\u0435\u0441 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430, and \u043a\u043e\u043c\u043f\u043e\u043d\u043e\u0432\u043a\u0430 \u043d\u0438\u0437\u0430 \u043a\u043e\u043b\u043e\u043d\u043d\u044b components. Similar \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 names or sizes do not always mean direct co\u041c\u041f\u0430tibility; \u0440\u0435\u0437\u044c\u0431\u0430 profile, shoulder design, gauge requirements, and applicable specIFications must be verIFied before combining dIFferent components.<\/p>\n\n<h3 class=\"wp-block-heading\"><strong>Why Are NC Connections Widely Used in Modern Drill Pipe?<\/strong><strong><\/strong><\/h3>\n\n<p class=\"wp-block-paragraph\"><strong>NC (Numbered Connection)<\/strong>\u00a0families improved the standardization of modern <strong>drill pipe connections<\/strong>\u00a0by providing defined connection series with controlled geometry and consistent identification. Unlike older connection names that mainly describe design characteristics, NC designations allow manufacturers and drilling contractors to specify connection requirements based on tool joint dimensions, compatibility, and inspection requirements.<\/p>\n\n<p class=\"wp-block-paragraph\">NC \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s iNClude <strong>NC31, NC38, NC40, NC46, and NC50<\/strong>, with each series representing a specIFic <strong>rotary shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/strong>\u00a0design. The \u0432\u044b\u0431\u043e\u0440 of an NC \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 depends on \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 size, required \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 capacity, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 configuration, and overall \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 design rather than the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 number alone.<\/p>\n\n<p class=\"wp-block-paragraph\">Modern \u0431\u0443\u0440\u0435\u043d\u0438\u0435 operations widely use NC \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s because they provide a practical balaNCe \u043c\u0435\u0436\u0434\u0443 torsional strength, hydraulic \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c resistaNCe, and component co\u041c\u041f\u0430tibility. Larger designs such as the <strong>NC50 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/strong>\u00a0are commonly \u0432\u044b\u0431\u0440\u0430\u0442\u044ced for higher-load \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435s where reliable \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transmission and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c are required.<\/p>\n\n<h2 class=\"wp-block-heading\">\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 Co\u041c\u041f\u0430tibility Requirements<\/h2>\n\n<p class=\"wp-block-paragraph\">\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s cannot be considered interchangeable only because they have the same nominal size or similar appearaNCe. The \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c depends on the complete design combination of the \u0448\u0435\u0439\u043a\u0430, \u043c\u0430\u0442\u043a\u0430, \u0440\u0435\u0437\u044c\u0431\u0430 profile, shoulder contact and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry.<\/p>\n\n<p class=\"wp-block-paragraph\">When replacing \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 sections or combining components from dIFferent sources, the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 must be verIFied before field operation. A mismatch in \u0440\u0435\u0437\u044c\u0431\u0430 design or shoulder contact may prevent correct make-up, reduce \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transfer efficieNCy and create additional stress coNCentration during \u0431\u0443\u0440\u0435\u043d\u0438\u0435.<\/p>\n\n<p class=\"wp-block-paragraph\">The \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 co\u041c\u041f\u0430tibility checks iNClude:<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Connection Geometry<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">The \u0448\u0435\u0439\u043a\u0430 and \u043c\u0430\u0442\u043a\u0430 \u0440\u0435\u0437\u044c\u0431\u0430 system must match in profile, taper, pitch and engagement design. INCorrect \u0440\u0435\u0437\u044c\u0431\u0430 matching can lead to iNComplete engagement, abnormal \u0438\u0437\u043d\u043e\u0441 or \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 damage during repeated make-up and break-out cycles.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Shoulder and Sealing Structure<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">The shoulder is responsible for transferring make-up \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439taining \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 stability. DIFferent shoulder designs may have dIFferent load distribution characteristics, meaning visually similar \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s may not provide the same mechanical \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Tool Joint Dimensions<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043d\u0430\u0440\u0443\u0436\u043d\u044b\u0439 \u0434\u0438\u0430\u043c\u0435\u0442\u0440, \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0438\u0439 \u0434\u0438\u0430\u043c\u0435\u0442\u0440 and overall \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions must be reviewed to avoid interfereNCe with other \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 components and to \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439tain required hydraulic \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Documentation and Inspection Records<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 co\u041c\u041f\u0430tibility should be confirmed through approved drawings, inspection records and traceability documents rather than \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 names alone. \u0440\u0435\u0437\u044c\u0431\u0430 gauges, dimensional inspection and manufacturing records provide the basis for final acceptaNCe.<\/p>\n\n<p class=\"wp-block-paragraph\">For mixed \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430s, engineers should confirm \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 co\u041c\u041f\u0430tibility before assembly by reviewing the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 specIFication, inspection requirements and operating conditions. Proper matching ensures that the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439tains expected mechanical \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c throughout \u0431\u0443\u0440\u0435\u043d\u0438\u0435 cycles.<strong>\u00a0<\/strong><\/p>\n\n<h2 class=\"wp-block-heading\">What Standard Controls \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0440\u0435\u0437\u044c\u0431\u0430 Manufacturing?<\/h2>\n\n<p class=\"wp-block-paragraph\">The manufacturing and inspection of \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s are controlled through applicable industry standards.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>API Spec 7-2<\/strong> specifically addresses:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>\u0440\u0435\u0437\u044c\u0431\u0430ing requirements<\/li>\n\n\n\n<li>Gauging requirements<\/li>\n\n\n\n<li>Rotary shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 control<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">The standard ensures that \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions and \u0440\u0435\u0437\u044c\u0431\u0430 characteristics are controlled during manufacturing and inspection.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>API Spec 5DP<\/strong> covers drill pipe product requirements, including the complete drill pipe assembly, material requirements, and manufacturing conditions.<\/p>\n\n<p class=\"wp-block-paragraph\">Together, these standards help control:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>\u0440\u0435\u0437\u044c\u0431\u0430 accuracy<\/li>\n\n\n\n<li>\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 interchangeability<\/li>\n\n\n\n<li>Dimensional consisteNCy<\/li>\n\n\n\n<li>Product \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u043e verIFication<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\"><strong>Premium Drill Pipe Connection Design and Performance<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">\u043f\u0440\u0435\u043c\u0438\u0443\u043c \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s are specially designed \u0440\u0435\u0437\u044c\u0431\u0430ed \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s developed to provide higher mechanical \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c and \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u0435ing \u043d\u0430\u0434\u0451\u0436\u043d\u043e\u0441\u0442\u044c than standard API rotary-shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s. Their design focuses on improving \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transmission, reducing \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 damage during repeated make-up and break-out cycles, and \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439taining integrity under complex \u0431\u0443\u0440\u0435\u043d\u0438\u0435 loads.<\/p>\n\n<p class=\"wp-block-paragraph\">Co\u041c\u041f\u0430red with conventional API \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s, \u043f\u0440\u0435\u043c\u0438\u0443\u043c \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s typically optimize the \u0440\u0435\u0437\u044c\u0431\u0430 profile, shoulder configuration, \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u0435ing structure and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry. These improvements help reduce stress coNCentration at critical areas and provide better \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c in high-angle \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s, extended-reach \u0431\u0443\u0440\u0435\u043d\u0438\u0435 and high-\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 \u0431\u0443\u0440\u0435\u043d\u0438\u0435 operations.<\/p>\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"692\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Premium-Drill-Pipe-Connection-Design-and-Performance-e1787299502853-1024x692.png\" alt=\"\" class=\"wp-image-14511\" style=\"width:1139px;height:auto\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Premium-Drill-Pipe-Connection-Design-and-Performance-e1787299502853-1024x692.png 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Premium-Drill-Pipe-Connection-Design-and-Performance-e1787299502853-300x203.png 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Premium-Drill-Pipe-Connection-Design-and-Performance-e1787299502853-768x519.png 768w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Premium-Drill-Pipe-Connection-Design-and-Performance-e1787299502853.png 1417w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">\u043f\u0440\u0435\u043c\u0438\u0443\u043c \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s are \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439ly \u0432\u044b\u0431\u0440\u0430\u0442\u044ced when standard API \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s cannot provide sufficient operating margin, iNCluding:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Extended-reach drilling:<\/strong>\u00a0Longer horizontal sections create higher torque and drag loads, requiring connections with improved torque resistance.<\/li>\n\n\n\n<li><strong>High-torque applications:<\/strong>\u00a0Rotary torque demand increases during difficult formations, directional drilling and heavy drilling operations.<\/li>\n\n\n\n<li><strong>Complex directional wells:<\/strong>\u00a0Frequent changes in drilling direction increase cyclic loading on the connection area.<\/li>\n\n\n\n<li><strong>Severe drilling environments:<\/strong>\u00a0High temperature, high pressure and repeated tripping operations require stronger connection fatigue performance.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">The \u0432\u044b\u0431\u043e\u0440 of a \u043f\u0440\u0435\u043c\u0438\u0443\u043c \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 should be based on the complete \u0431\u0443\u0440\u0435\u043d\u0438\u0435 program, iNCluding \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 requirement, \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 profile, \u0431\u0443\u0440\u0435\u043d\u0438\u0435 fluid system, operating cycles and co\u041c\u041f\u0430tibility with the existing \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430.<\/p>\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"446\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Premium-drill-pipe-connection-design-with-double-shoulder-and-enhanced-torque-performance-e1787300062660-1024x446.png\" alt=\"\" class=\"wp-image-14512\" style=\"aspect-ratio:2.2959921798631475;width:1121px;height:auto\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Premium-drill-pipe-connection-design-with-double-shoulder-and-enhanced-torque-performance-e1787300062660-1024x446.png 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Premium-drill-pipe-connection-design-with-double-shoulder-and-enhanced-torque-performance-e1787300062660-300x131.png 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Premium-drill-pipe-connection-design-with-double-shoulder-and-enhanced-torque-performance-e1787300062660-768x335.png 768w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Premium-drill-pipe-connection-design-with-double-shoulder-and-enhanced-torque-performance-e1787300062660-1536x670.png 1536w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/Premium-drill-pipe-connection-design-with-double-shoulder-and-enhanced-torque-performance-e1787300062660.png 1610w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\"><strong>Drill Pipe Connection Selection Considerations<\/strong><strong><\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">\u0432\u044b\u0431\u0440\u0430\u0442\u044cing the correct \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 requires matching the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 design with actual \u0431\u0443\u0440\u0435\u043d\u0438\u0435 conditions rather than choosing only the highest \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442-rated option. The \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 must provide sufficient mechanical strength while \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439taining co\u041c\u041f\u0430tibility with the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430, hydraulic requirements and field operating practices.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Selection Factor<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Engineering Consideration<\/strong><strong><\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 depth and trajectory<\/td><td class=\"has-text-align-center\" data-align=\"center\">Determines expected \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, tensile loading and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c exposure<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Hole size and BHA design<\/td><td class=\"has-text-align-center\" data-align=\"center\">InflueNCes \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 size, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 clearaNCe and co\u041c\u041f\u0430tibility<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 requirement<\/td><td class=\"has-text-align-center\" data-align=\"center\">Determines whether API or \u043f\u0440\u0435\u043c\u0438\u0443\u043c \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c is required<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Mud system and hydraulic program<\/td><td class=\"has-text-align-center\" data-align=\"center\">Affects internal dia\u043c\u0435\u0442\u0440, pressure loss and flow efficieNCy<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Directional \u0431\u0443\u0440\u0435\u043d\u0438\u0435 conditions<\/td><td class=\"has-text-align-center\" data-align=\"center\">Higher dogleg severity iNCreases cyclic stress on \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Existing \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 co\u041c\u041f\u0430tibility<\/td><td class=\"has-text-align-center\" data-align=\"center\">Ensures proper \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 matching during assembly and replacement<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Inspection requirements<\/td><td class=\"has-text-align-center\" data-align=\"center\">Defines \u0440\u0435\u0437\u044c\u0431\u0430 inspection, gauging and acceptaNCe criteria<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">A suitable \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0432\u044b\u0431\u043e\u0440 balaNCes \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 capacity, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c resistaNCe, hydraulic \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c and field co\u041c\u041f\u0430tibility. Over-specIFying the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 can iNCrease \u0441\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u044c, while under-specIFying may lead to premature \u0438\u0437\u043d\u043e\u0441, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 damage or operational downtime.<\/p>\n\n<h2 class=\"wp-block-heading\">OCTAL \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 Supply Scope<\/h2>\n\n<p class=\"wp-block-paragraph\">OCTAL provides <strong>API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 solutions<\/strong> with various <strong>rotary shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/strong> options to meet dIFferent \u0431\u0443\u0440\u0435\u043d\u0438\u0435 requirements. The supply scope covers standard API \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 families, customized \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 configurations, and related inspection requirements.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Capability<\/th><th class=\"has-text-align-center\" data-align=\"center\">Description<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/td><td class=\"has-text-align-center\" data-align=\"center\">REG, IF, FH, and NC \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 options based on project requirements<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">NC \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 Series<\/td><td class=\"has-text-align-center\" data-align=\"center\">NC38, NC40, NC46, NC50 configurations for dIFferent \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435s<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Special \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 Solutions<\/td><td class=\"has-text-align-center\" data-align=\"center\">Customized \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 designs for demanding \u0431\u0443\u0440\u0435\u043d\u0438\u0435 conditions<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u043a\u0430\u0447\u0435\u0441\u0442\u0432\u043e Control<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0440\u0435\u0437\u044c\u0431\u0430 inspection, dimensional verIFication, and product traceability<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">OCTAL supports \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0432\u044b\u0431\u043e\u0440 and supply by considering \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 type, \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 co\u041c\u041f\u0430tibility, operating conditions, and applicable project specIFications.<\/p>\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-d61d70aa wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.drillpipes.com\/ru\/%d0%ba%d0%be%d0%bd%d1%82%d0%b0%d0%ba%d1%82%d1%8b\/\">Free Quotation<\/a><\/div>\n<\/div>\n\n<h2 class=\"wp-block-heading\"><strong>FAQ<\/strong><\/h2>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>What are the most common drill pipe thread types?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\">The most recognized API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0442\u0438\u043f \u0440\u0435\u0437\u044c\u0431\u044bs iNClude REG, IF, FH, and NC \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s. Modern \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430s commonly use NC \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 families because of their standardized design and broad \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435 range.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Is NC50 the same as a 4 1\/2 IF connection?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\">No. Although some historical \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435s relate NC50 with certain older IF \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 sizes, they are dIFferent \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 designs. Actual co\u041c\u041f\u0430tibility requires verIFication of \u0440\u0435\u0437\u044c\u0431\u0430 geometry, shoulder design, and applicable specIFications.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>What standard covers drill pipe connections?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\">Rotary shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0440\u0435\u0437\u044c\u0431\u0430ing and gauging requirements are covered by API Spec 7-2. \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 product requirements are covered by API Spec 5DP.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Can different drill pipe thread types be connected together?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\">DIFferent \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 types should not be connected unless co\u041c\u041f\u0430tibility has been specIFically verIFied. Proper matching requires confirmation of \u0440\u0435\u0437\u044c\u0431\u0430 profile, shoulder contact, dimensions, and manufacturer requirements.<\/p>\n<\/details>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"410\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-1024x410.png\" alt=\"\" class=\"wp-image-12635\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-1024x410.png 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-300x120.png 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-2000x800.png 2000w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Drill Pipe Thread Types\u00a0refer to the standardized thread designs machined on oilfield drill pipe tool joints to connect individual drill pipe sections into a complete drill string. These thread types define how the external pin connection\u00a0and internal box connection\u00a0engage with each other, allowing drill pipes to transmit rotation, withstand axial loads, and maintain structural integrity &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.drillpipes.com\/ru\/%d0%ba%d0%b0%d0%ba%d0%b8%d0%b5-the-%d0%be%d1%81%d0%bd%d0%be%d0%b2%d0%bd%d0%be%d0%b9-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-%d1%82%d0%b8%d0%bf-%d1%80\/\" class=\"more-link\">\u0427\u0438\u0442\u0430\u0442\u044c \u0434\u0430\u043b\u0435\u0435<span class=\"screen-reader-text\"> &#171;\u043a\u0430\u043a\u0438\u0435 the \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0442\u0438\u043f \u0440\u0435\u0437\u044c\u0431\u044bs?&#187;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":16001,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[106],"tags":[],"class_list":["post-15996","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-106"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u043a\u0430\u043a\u0438\u0435 the \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0439 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0442\u0438\u043f \u0440\u0435\u0437\u044c\u0431\u044bs? - Octal<\/title>\n<meta name=\"description\" content=\"\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0442\u0438\u043f \u0440\u0435\u0437\u044c\u0431\u044bs cover REG, IF, FH and NC rotary shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s, explaining \u0448\u0435\u0439\u043a\u0430 and \u043c\u0430\u0442\u043a\u0430 design, \u0440\u0435\u0437\u044c\u0431\u0430 structure, API 7-2 requirements and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0432\u044b\u0431\u043e\u0440 for reliable \u043d\u0435\u0444\u0442\u044cfield \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435s.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.drillpipes.com\/ru\/%d0%ba%d0%b0%d0%ba%d0%b8%d0%b5-the-%d0%be%d1%81%d0%bd%d0%be%d0%b2%d0%bd%d0%be%d0%b9-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-%d1%82%d0%b8%d0%bf-%d1%80\/\" \/>\n<meta property=\"og:locale\" content=\"ru_RU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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