{"id":15989,"date":"2026-08-21T18:06:31","date_gmt":"2026-08-21T10:06:31","guid":{"rendered":"https:\/\/www.drillpipes.com\/%d9%85%d8%a7-%d9%87%d9%8a-the-%d8%a7%d9%84%d8%b1%d8%a6%d9%8a%d8%b3%d9%8a-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-%d9%86%d9%88%d8%b9-%d8%a7%d9%84%d8%ae%d9%8a%d8%b7s\/"},"modified":"2026-09-18T16:18:47","modified_gmt":"2026-09-18T08:18:47","slug":"%d9%85%d8%a7-%d9%87%d9%8a-the-%d8%a7%d9%84%d8%b1%d8%a6%d9%8a%d8%b3%d9%8a-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-%d9%86%d9%88%d8%b9-%d8%a7%d9%84%d8%ae%d9%8a%d8%b7s","status":"publish","type":"post","link":"https:\/\/www.drillpipes.com\/ar\/%d9%85%d8%a7-%d9%87%d9%8a-the-%d8%a7%d9%84%d8%b1%d8%a6%d9%8a%d8%b3%d9%8a-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-%d9%86%d9%88%d8%b9-%d8%a7%d9%84%d8%ae%d9%8a%d8%b7s\/","title":{"rendered":"\u0645\u0627 \u0647\u064a the \u0627\u0644\u0631\u0626\u064a\u0633\u064a \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0646\u0648\u0639 \u0627\u0644\u062e\u064a\u0637s?"},"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 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u062e\u064a\u0637s \u0645\u0633\u062a\u0639\u0645\u0644 in general pi\u0627\u0644\u062f\u0628\u0648\u0633g systems, <strong>\u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s<\/strong>\u00a0are designed as <strong>rotary shouldered \u0627\u0644\u0648\u0635\u0644\u0629s (RSC)<\/strong>. The \u0627\u0644\u0648\u0635\u0644\u0629 system iNCludes the \u0627\u0644\u062e\u064a\u0637 profile, shoulder surface, \u0627\u0644\u062e\u062a\u0645ing area, and controlled dimensions of the \u0627\u0644\u0648\u0635\u0644\u0629. These elements work together to transfer \u0627\u0644\u062d\u0641\u0631 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 from the surface equipment to the \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629 families iNClude <strong>REG (Regular), IF (Internal Flush), FH (Full Hole), and NC (Numbered \u0627\u0644\u0648\u0635\u0644\u0629)<\/strong>. Modern \u0627\u0644\u062d\u0641\u0631 operations may also use \u0645\u062a\u0645\u064a\u0632 \u0627\u0644\u0648\u0635\u0644\u0629s with enhaNCed shoulder designs and higher \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 capacity for demanding \u0627\u0644\u062d\u0641\u0631 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\">\u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s are \u0627\u0644\u062e\u064a\u0637ed rotary-shouldered joints located at both ends of the \u0627\u0644\u0648\u0635\u0644\u0629, allowing individual \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 sections to be assembled into a complete \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631. The \u0627\u0644\u0648\u0635\u0644\u0629 transfers \u0627\u0644\u062d\u0641\u0631 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, supports axial loads and \u0627\u0644\u0631\u0626\u064a\u0633\u064atains mechanical integrity during repeated make-up, \u0627\u0644\u062d\u0641\u0631 and break-out operations.<\/p>\n\n<p class=\"wp-block-paragraph\">A \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629 is not only a \u0627\u0644\u062e\u064a\u0637ed interface. Its \u0627\u0644\u0623\u062f\u0627\u0621 depends on the interaction \u0628\u064a\u0646 the \u0627\u0644\u062f\u0628\u0648\u0633, \u0627\u0644\u0635\u0646\u062f\u0648\u0642, shoulder, \u0627\u0644\u062e\u064a\u0637 profile and \u0627\u0644\u0648\u0635\u0644\u0629 dimensions. These components work together to achieve proper load transfer, \u0627\u0644\u062e\u062a\u0645ing \u0627\u0644\u0623\u062f\u0627\u0621 and \u0627\u0644\u062a\u0639\u0628 resistaNCe under \u0627\u0644\u062d\u0641\u0631 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\">\u0627\u0644\u062f\u0628\u0648\u0633 \u0627\u0644\u0648\u0635\u0644\u0629<\/td><td class=\"has-text-align-center\" data-align=\"center\">External \u0627\u0644\u062e\u064a\u0637ed section that enters the \u0627\u0644\u0635\u0646\u062f\u0648\u0642 and provides mechanical engagement<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u0635\u0646\u062f\u0648\u0642 \u0627\u0644\u0648\u0635\u0644\u0629<\/td><td class=\"has-text-align-center\" data-align=\"center\">Internal \u0627\u0644\u062e\u064a\u0637ed section that receives the \u0627\u0644\u062f\u0628\u0648\u0633 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 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and stabilizes the \u0627\u0644\u0648\u0635\u0644\u0629<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u062e\u064a\u0637 profile<\/td><td class=\"has-text-align-center\" data-align=\"center\">Controls engagement strength, load distribution and \u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u0623\u062f\u0627\u0621<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u0648\u0635\u0644\u0629 dimensions<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u0631\u0626\u064a\u0633\u064atains manufacturing accuracy, coMPatibility 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 \u0627\u0644\u062d\u0641\u0631, the \u0627\u0644\u0648\u0635\u0644\u0629 transfers \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 from the surface drive system to the \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 while supporting tensile, bending and pressure loads generated during operation. The \u0627\u0644\u062e\u064a\u0637 profile, shoulder contact and \u0627\u0644\u0648\u0635\u0644\u0629 geometry must work together to \u0627\u0644\u0631\u0626\u064a\u0633\u064atain load distribution and \u0627\u0644\u0648\u0635\u0644\u0629 integrity.<\/p>\n\n<p class=\"wp-block-paragraph\">Rotational \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 determines the \u0627\u0644\u0648\u0635\u0644\u0629\u2019s ability to transmit \u0627\u0644\u062d\u0641\u0631 power without excessive stress. Tensile loading from the \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0632\u0646 affects \u0627\u0644\u0648\u0635\u0644\u0629 strength requirements, while bending stress during directional \u0627\u0644\u062d\u0641\u0631 iNCreases \u0627\u0644\u062a\u0639\u0628 exposure. Internal and external pressure conditions also require reliable \u0627\u0644\u062e\u062a\u0645ing \u0627\u0644\u0623\u062f\u0627\u0621 throughout \u0627\u0644\u062d\u0641\u0631 cycles.<\/p>\n\n<p class=\"wp-block-paragraph\">Because these loads act simultaneously, \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s should be \u0627\u062e\u062a\u064a\u0627\u0631ed based on the complete \u0627\u0644\u062d\u0641\u0631 environment, iNCluding \u0627\u0644\u0628\u0626\u0631 trajectory, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 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=\"\u062a\u0636\u0645\u064a\u0646 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\">\u0627\u0644\u062d\u0641\u0631_\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628_\u0627\u0644\u0648\u0635\u0644\u0629_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\">\u0627\u0644\u0646\u0641\u0637field <strong>\u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0646\u0648\u0639 \u0627\u0644\u062e\u064a\u0637s<\/strong>\u00a0are \u0627\u0644\u0631\u0626\u064a\u0633\u064aly classIFied according to their \u0627\u0644\u0648\u0635\u0644\u0629 design, load capability, and \u0627\u0644\u062a\u0637\u0628\u064a\u0642 requirements. Most \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631s use <strong><a href=\"__PROTECTED_0__\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-secondary-color\">rotary shouldered \u0627\u0644\u0648\u0635\u0644\u0629s<\/mark><\/a> (RSC)<\/strong>, where the \u0627\u0644\u062e\u064a\u0637ed \u0627\u0644\u062f\u0628\u0648\u0633 and \u0627\u0644\u0635\u0646\u062f\u0648\u0642 sections work together with the shoulder surface to transfer \u0627\u0644\u062d\u0641\u0631 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and \u0627\u0644\u0631\u0626\u064a\u0633\u064atain \u0627\u0644\u0648\u0635\u0644\u0629 strength during operation.<\/p>\n\n<p class=\"wp-block-paragraph\">The \u0627\u0644\u0631\u0626\u064a\u0633\u064a categories iNClude <strong>API standard \u0627\u0644\u0648\u0635\u0644\u0629s<\/strong>\u00a0and <strong>\u0645\u062a\u0645\u064a\u0632 \u0627\u0644\u0648\u0635\u0644\u0629s<\/strong>. API standard \u0627\u0644\u0648\u0635\u0644\u0629s such as <strong>REG, IF, FH, and NC<\/strong>\u00a0are widely \u0645\u0633\u062a\u0639\u0645\u0644 because their \u0627\u0644\u062e\u064a\u0637 profiles and dimensions are defined by industry specIFications, allowing manufacturers and \u0627\u0644\u062d\u0641\u0631 contractors to \u0627\u062e\u062a\u064a\u0627\u0631 coMPatible \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 components. \u0645\u062a\u0645\u064a\u0632 \u0627\u0644\u0648\u0635\u0644\u0629s use modIFied \u0627\u0644\u062e\u064a\u0637 and shoulder designs to achieve higher \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 capacity, improved \u0627\u0644\u062a\u0639\u0628 resistaNCe, or \u0627\u0644\u0623\u062f\u0627\u0621 requirements for more demanding \u0627\u0644\u062d\u0641\u0631 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 \u0627\u0644\u0648\u0635\u0644\u0629s with defined \u0627\u0644\u062e\u064a\u0637 geometry, \u0645\u0633\u062a\u0639\u0645\u0644 for common \u0627\u0644\u0646\u0641\u0637field \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062a\u0637\u0628\u064a\u0642s and coMPatible \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 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\">\u0645\u0632\u062f\u0648\u062c shoulder and proprietary designs<\/td><td class=\"has-text-align-center\" data-align=\"center\">Optimized \u0627\u0644\u062e\u064a\u0637 and shoulder structures for higher \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 transmission, improved \u0627\u0644\u062a\u0639\u0628 \u0627\u0644\u0623\u062f\u0627\u0621, and specIFic \u0627\u0644\u062d\u0641\u0631 environments<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">For all \u0627\u0644\u0648\u0635\u0644\u0629 types, \u0627\u0644\u0623\u062f\u0627\u0621 depends on more than the \u0627\u0644\u062e\u064a\u0637 name. The actual capability is determined by the complete \u0627\u0644\u0648\u0635\u0644\u0629 design, iNCluding <strong>\u0627\u0644\u062f\u0628\u0648\u0633 and \u0627\u0644\u0635\u0646\u062f\u0648\u0642 geometry, shoulder contact, \u0627\u0644\u0648\u0635\u0644\u0629 dimensions, \u0627\u0644\u062e\u064a\u0637 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 \u0627\u0644\u0648\u0635\u0644\u0629 uses a traditional \u0627\u0644\u062e\u064a\u0637 profile with strong mechanical engagement. CoMPared with later flush-type designs, REG \u0627\u0644\u0648\u0635\u0644\u0629s generally have greater internal restriction because of their \u0627\u0644\u0648\u0635\u0644\u0629 geometry.<\/p>\n\n<p class=\"wp-block-paragraph\">\u0627\u0644\u0631\u0626\u064a\u0633\u064a 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\">\u0627\u0644\u0648\u0635\u0644\u0629 type<\/td><td class=\"has-text-align-center\" data-align=\"center\">API rotary shouldered \u0627\u0644\u0648\u0635\u0644\u0629<\/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 coMPared with flush designs<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u062a\u0637\u0628\u064a\u0642<\/td><td class=\"has-text-align-center\" data-align=\"center\">Conventional \u0627\u0644\u062d\u0641\u0631 operations<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">REG \u0627\u0644\u0648\u0635\u0644\u0629s re\u0627\u0644\u0631\u0626\u064a\u0633\u064a recognized within the \u0627\u0644\u0646\u0641\u0637field industry, especially when replacing existing \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 components where \u0627\u0644\u0648\u0635\u0644\u0629 coMPatibility is required.<\/p>\n\n<h2 class=\"wp-block-heading\">IF \u0627\u0644\u062e\u064a\u0637 (Internal Flush \u0627\u0644\u0648\u0635\u0644\u0629)<\/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 \u0628\u064a\u0646 the \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 bore and the \u0627\u0644\u0648\u0635\u0644\u0629 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\">\u0627\u0644\u0648\u0635\u0644\u0629 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\">\u0627\u0644\u0631\u0626\u064a\u0633\u064a 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 \u0627\u0644\u0648\u0635\u0644\u0629 strength<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u062a\u0637\u0628\u064a\u0642<\/td><td class=\"has-text-align-center\" data-align=\"center\">Conventional \u0627\u0644\u0646\u0641\u0637field \u0627\u0644\u062d\u0641\u0631<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">When evaluating an IF \u0627\u0644\u0648\u0635\u0644\u0629, engineers must consider more than the \u0627\u0644\u062e\u064a\u0637 name. \u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u0642\u0637\u0631 \u0627\u0644\u062e\u0627\u0631\u062c\u064a, \u0627\u0644\u0642\u0637\u0631 \u0627\u0644\u062f\u0627\u062e\u0644\u064a, shoulder design, and \u0627\u0644\u0648\u0635\u0644\u0629 condition all affect actual \u0627\u0644\u0623\u062f\u0627\u0621.<\/p>\n\n<h2 class=\"wp-block-heading\">FH \u0627\u0644\u062e\u064a\u0637 (Full Hole \u0627\u0644\u0648\u0635\u0644\u0629)<\/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 coMPared with some earlier \u0627\u0644\u0648\u0635\u0644\u0629 designs, reducing flow restriction through the \u0627\u0644\u0648\u0635\u0644\u0629 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\">\u0627\u0644\u0631\u0626\u064a\u0633\u064a characteristics:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Larger internal opening coMPared with traditional restricted designs<\/li>\n\n\n\n<li>Suitable for \u0627\u0644\u062a\u0637\u0628\u064a\u0642s requiring improved hydraulic \u0627\u0644\u0623\u062f\u0627\u0621<\/li>\n\n\n\n<li>Part of the historical development of API \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Although many modern \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631s use NC \u0627\u0644\u0648\u0635\u0644\u0629s, FH re\u0627\u0644\u0631\u0626\u064a\u0633\u064as an important \u0627\u0644\u0648\u0635\u0644\u0629 type when discussing API \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629 evolution.<\/p>\n<\/div><\/div>\n\n<h2 class=\"wp-block-heading\">NC \u0627\u0644\u062e\u064a\u0637 (Numbered \u0627\u0644\u0648\u0635\u0644\u0629)<\/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 \u0627\u0644\u0648\u0635\u0644\u0629 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\">\u0627\u0644\u0648\u0635\u0644\u0629<\/th><th class=\"has-text-align-center\" data-align=\"center\">General \u0627\u0644\u062a\u0637\u0628\u064a\u0642 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 \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062a\u0637\u0628\u064a\u0642s<\/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 \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062a\u0637\u0628\u064a\u0642s<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">NC40<\/td><td class=\"has-text-align-center\" data-align=\"center\">General \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062a\u0637\u0628\u064a\u0642s<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">NC46<\/td><td class=\"has-text-align-center\" data-align=\"center\">Larger \u0627\u0644\u0648\u0635\u0644\u0629 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 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 \u0627\u0644\u062a\u0637\u0628\u064a\u0642s<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">The NC designation identIFies the \u0627\u0644\u0648\u0635\u0644\u0629 family rather than simply indicating \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 size. \u0627\u0644\u0627\u062e\u062a\u064a\u0627\u0631 depends on the complete \u0627\u0644\u0648\u0635\u0644\u0629 design, iNCluding <strong>\u0627\u0644\u0648\u0635\u0644\u0629 dimensions, \u0627\u0644\u062e\u064a\u0637 profile, shoulder configuration, \u0627\u0644\u062d\u0641\u0631 requirements and inspection control<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\">In modern \u0627\u0644\u062d\u0641\u0631 operations, NC \u0627\u0644\u0648\u0635\u0644\u0629s are widely \u0645\u0633\u062a\u0639\u0645\u0644 because their standardized geometry improves \u0627\u0644\u0648\u0635\u0644\u0629 coMPatibility and specIFication control. Larger \u0627\u0644\u0648\u0635\u0644\u0629 families, such as <strong>NC50<\/strong>, are commonly \u0627\u062e\u062a\u064a\u0627\u0631ed for \u0627\u0644\u062a\u0637\u0628\u064a\u0642s requiring higher \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 capacity and larger \u0627\u0644\u0648\u0635\u0644\u0629 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=\"\u062a\u0636\u0645\u064a\u0646 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_\u0627\u0644\u062d\u0641\u0631_\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628_\u0627\u0644\u0648\u0635\u0644\u0629_Types_and_\u0627\u0644\u0627\u062e\u062a\u064a\u0627\u0631_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>\u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0646\u0648\u0639 \u0627\u0644\u062e\u064a\u0637s<\/strong>\u00a0were developed to address dIFferent \u0627\u0644\u062d\u0641\u0631 requirements, iNCluding \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 transmission, hydraulic flow efficieNCy, \u0627\u0644\u0648\u0635\u0644\u0629 strength, and coMPatibility with existing \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 components.<\/p>\n\n<p class=\"wp-block-paragraph\">Although REG, IF, FH, and NC are all <strong>rotary shouldered \u0627\u0644\u0648\u0635\u0644\u0629s<\/strong>, their \u0627\u0644\u062e\u064a\u0637 geometry and internal profile are dIFferent. These \u0627\u0644\u0641\u0631\u0642s affect how the \u0627\u0644\u0648\u0635\u0644\u0629 performs under \u0627\u0644\u062d\u0641\u0631 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 \u0627\u0644\u0648\u0635\u0644\u0629 with a relatively large \u0627\u0644\u062e\u064a\u0637 engagement area and smaller internal flow passage coMPared with flush-type designs<\/td><td class=\"has-text-align-center\" data-align=\"center\">Provides reliable mechanical engagement and good \u0627\u0644\u0648\u0635\u0644\u0629 durability, but the internal restriction can iNCrease pressure loss in high-flow \u0627\u0644\u062d\u0641\u0631 systems<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u062e\u062a\u064a\u0627\u0631ed where existing \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 coMPatibility and conventional \u0627\u0644\u062d\u0641\u0631 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 \u0628\u064a\u0646 the \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 bore and \u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u0648\u0635\u0644\u0629<\/td><td class=\"has-text-align-center\" data-align=\"center\">Reduces internal flow restriction coMPared with traditional \u0627\u0644\u0648\u0635\u0644\u0629 designs, hel\u0627\u0644\u062f\u0628\u0648\u0633g improve \u0627\u0644\u062d\u0641\u0631 fluid circulation efficieNCy<\/td><td class=\"has-text-align-center\" data-align=\"center\">Considered when hydraulic \u0627\u0644\u0623\u062f\u0627\u0621 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 \u0627\u0644\u0648\u0635\u0644\u0629 designs<\/td><td class=\"has-text-align-center\" data-align=\"center\">Provides improved internal flow capacity while \u0627\u0644\u0631\u0626\u064a\u0633\u064ataining API rotary shouldered \u0627\u0644\u0648\u0635\u0644\u0629 characteristics<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0645\u0633\u062a\u0639\u0645\u0644 when larger internal flow area is required and \u0627\u0644\u0648\u0635\u0644\u0629 coMPatibility is \u0627\u0644\u0631\u0626\u064a\u0633\u064atained 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 \u0627\u0644\u0648\u0635\u0644\u0629 family using designations such as NC38, NC40, NC46, and NC50<\/td><td class=\"has-text-align-center\" data-align=\"center\">Provides standardized \u0627\u0644\u0648\u0635\u0644\u0629 geometry with a balaNCe \u0628\u064a\u0646 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 capacity, hydraulic \u0627\u0644\u0623\u062f\u0627\u0621, and interchangeability<\/td><td class=\"has-text-align-center\" data-align=\"center\">Widely \u0627\u062e\u062a\u064a\u0627\u0631ed for modern \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631s because \u0627\u0644\u0648\u0635\u0644\u0629 size and \u0627\u0644\u0623\u062f\u0627\u0621 can be matched to \u0627\u0644\u062d\u0641\u0631 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 \u0627\u0644\u0641\u0631\u0642s \u0628\u064a\u0646 <strong>REG, IF, FH, and NC \u0627\u0644\u0648\u0635\u0644\u0629s<\/strong>\u00a0directly affect \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 transfer, hydraulic \u0627\u0644\u0623\u062f\u0627\u0621, and \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 coMPatibility. During \u0627\u0644\u062d\u0641\u0631, the \u0627\u0644\u0648\u0635\u0644\u0629 must \u0627\u0644\u0631\u0626\u064a\u0633\u064atain reliable contact \u0628\u064a\u0646 the <strong>\u0627\u0644\u062f\u0628\u0648\u0633, \u0627\u0644\u0635\u0646\u062f\u0648\u0642, and shoulder<\/strong>\u00a0to transmit rotation and withstand repeated loading conditions.<\/p>\n\n<p class=\"wp-block-paragraph\">Larger \u0627\u0644\u0648\u0635\u0644\u0629 families, such as the <strong>NC50 \u0627\u0644\u0648\u0635\u0644\u0629<\/strong>, are commonly \u0627\u062e\u062a\u064a\u0627\u0631ed for higher \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 \u0627\u0644\u062a\u0637\u0628\u064a\u0642s because their geometry provides greater load-carrying capability. Meanwhile, \u0627\u0644\u0648\u0635\u0644\u0629 designs with improved internal flush characteristics can reduce hydraulic restriction and support efficient \u0627\u0644\u062d\u0641\u0631 fluid circulation.<\/p>\n\n<p class=\"wp-block-paragraph\">\u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u0627\u062e\u062a\u064a\u0627\u0631 also depends on the complete \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 configuration, iNCluding \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631, crossover subs, heavy \u0627\u0644\u0648\u0632\u0646 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631, and \u0645\u062c\u0645\u0648\u0639\u0629 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0633\u0641\u0644\u064a\u0629 components. Similar \u0627\u0644\u0648\u0635\u0644\u0629 names or sizes do not always mean direct coMPatibility; \u0627\u0644\u062e\u064a\u0637 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 \u0627\u0644\u0648\u0635\u0644\u0629s iNClude <strong>NC31, NC38, NC40, NC46, and NC50<\/strong>, with each series representing a specIFic <strong>rotary shouldered \u0627\u0644\u0648\u0635\u0644\u0629<\/strong>\u00a0design. The \u0627\u0644\u0627\u062e\u062a\u064a\u0627\u0631 of an NC \u0627\u0644\u0648\u0635\u0644\u0629 depends on \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 size, required \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 capacity, \u0627\u0644\u0648\u0635\u0644\u0629 configuration, and overall \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 design rather than the \u0627\u0644\u0648\u0635\u0644\u0629 number alone.<\/p>\n\n<p class=\"wp-block-paragraph\">Modern \u0627\u0644\u062d\u0641\u0631 operations widely use NC \u0627\u0644\u0648\u0635\u0644\u0629s because they provide a practical balaNCe \u0628\u064a\u0646 torsional strength, hydraulic \u0627\u0644\u0623\u062f\u0627\u0621, \u0627\u0644\u062a\u0639\u0628 resistaNCe, and component coMPatibility. Larger designs such as the <strong>NC50 \u0627\u0644\u0648\u0635\u0644\u0629<\/strong>\u00a0are commonly \u0627\u062e\u062a\u064a\u0627\u0631ed for higher-load \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062a\u0637\u0628\u064a\u0642s where reliable \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 transmission and \u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u0623\u062f\u0627\u0621 are required.<\/p>\n\n<h2 class=\"wp-block-heading\">\u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629 CoMPatibility Requirements<\/h2>\n\n<p class=\"wp-block-paragraph\">\u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s cannot be considered interchangeable only because they have the same nominal size or similar appearaNCe. The \u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u0623\u062f\u0627\u0621 depends on the complete design combination of the \u0627\u0644\u062f\u0628\u0648\u0633, \u0627\u0644\u0635\u0646\u062f\u0648\u0642, \u0627\u0644\u062e\u064a\u0637 profile, shoulder contact and \u0627\u0644\u0648\u0635\u0644\u0629 geometry.<\/p>\n\n<p class=\"wp-block-paragraph\">When replacing \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 sections or combining components from dIFferent sources, the \u0627\u0644\u0648\u0635\u0644\u0629 must be verIFied before field operation. A mismatch in \u0627\u0644\u062e\u064a\u0637 design or shoulder contact may prevent correct make-up, reduce \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 transfer efficieNCy and create additional stress coNCentration during \u0627\u0644\u062d\u0641\u0631.<\/p>\n\n<p class=\"wp-block-paragraph\">The \u0627\u0644\u0631\u0626\u064a\u0633\u064a coMPatibility checks iNClude:<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Connection Geometry<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">The \u0627\u0644\u062f\u0628\u0648\u0633 and \u0627\u0644\u0635\u0646\u062f\u0648\u0642 \u0627\u0644\u062e\u064a\u0637 system must match in profile, taper, pitch and engagement design. INCorrect \u0627\u0644\u062e\u064a\u0637 matching can lead to iNComplete engagement, abnormal \u0627\u0644\u062a\u0622\u0643\u0644 or \u0627\u0644\u0648\u0635\u0644\u0629 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 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and \u0627\u0644\u0631\u0626\u064a\u0633\u064ataining \u0627\u0644\u0648\u0635\u0644\u0629 stability. DIFferent shoulder designs may have dIFferent load distribution characteristics, meaning visually similar \u0627\u0644\u0648\u0635\u0644\u0629s may not provide the same mechanical \u0627\u0644\u0623\u062f\u0627\u0621.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Tool Joint Dimensions<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">\u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u0642\u0637\u0631 \u0627\u0644\u062e\u0627\u0631\u062c\u064a, \u0627\u0644\u0642\u0637\u0631 \u0627\u0644\u062f\u0627\u062e\u0644\u064a and overall \u0627\u0644\u0648\u0635\u0644\u0629 dimensions must be reviewed to avoid interfereNCe with other \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 components and to \u0627\u0644\u0631\u0626\u064a\u0633\u064atain required hydraulic \u0627\u0644\u0623\u062f\u0627\u0621.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Documentation and Inspection Records<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">\u0627\u0644\u0648\u0635\u0644\u0629 coMPatibility should be confirmed through approved drawings, inspection records and traceability documents rather than \u0627\u0644\u0648\u0635\u0644\u0629 names alone. \u0627\u0644\u062e\u064a\u0637 gauges, dimensional inspection and manufacturing records provide the basis for final acceptaNCe.<\/p>\n\n<p class=\"wp-block-paragraph\">For mixed \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631s, engineers should confirm \u0627\u0644\u0648\u0635\u0644\u0629 coMPatibility before assembly by reviewing the \u0627\u0644\u0648\u0635\u0644\u0629 specIFication, inspection requirements and operating conditions. Proper matching ensures that the \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0631\u0626\u064a\u0633\u064atains expected mechanical \u0627\u0644\u0623\u062f\u0627\u0621 throughout \u0627\u0644\u062d\u0641\u0631 cycles.<strong>\u00a0<\/strong><\/p>\n\n<h2 class=\"wp-block-heading\">What Standard Controls \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062e\u064a\u0637 Manufacturing?<\/h2>\n\n<p class=\"wp-block-paragraph\">The manufacturing and inspection of \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s 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>\u0627\u0644\u062e\u064a\u0637ing requirements<\/li>\n\n\n\n<li>Gauging requirements<\/li>\n\n\n\n<li>Rotary shouldered \u0627\u0644\u0648\u0635\u0644\u0629 control<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">The standard ensures that \u0627\u0644\u0648\u0635\u0644\u0629 dimensions and \u0627\u0644\u062e\u064a\u0637 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>\u0627\u0644\u062e\u064a\u0637 accuracy<\/li>\n\n\n\n<li>\u0627\u0644\u0648\u0635\u0644\u0629 interchangeability<\/li>\n\n\n\n<li>Dimensional consisteNCy<\/li>\n\n\n\n<li>Product \u0627\u0644\u062c\u0648\u062f\u0629 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\">\u0645\u062a\u0645\u064a\u0632 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s are specially designed \u0627\u0644\u062e\u064a\u0637ed \u0627\u0644\u0648\u0635\u0644\u0629s developed to provide higher mechanical \u0627\u0644\u0623\u062f\u0627\u0621 and \u0627\u0644\u062e\u062a\u0645ing \u0627\u0644\u0645\u0648\u062b\u0648\u0642\u064a\u0629 than standard API rotary-shouldered \u0627\u0644\u0648\u0635\u0644\u0629s. Their design focuses on improving \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 transmission, reducing \u0627\u0644\u0648\u0635\u0644\u0629 damage during repeated make-up and break-out cycles, and \u0627\u0644\u0631\u0626\u064a\u0633\u064ataining integrity under complex \u0627\u0644\u062d\u0641\u0631 loads.<\/p>\n\n<p class=\"wp-block-paragraph\">CoMPared with conventional API \u0627\u0644\u0648\u0635\u0644\u0629s, \u0645\u062a\u0645\u064a\u0632 \u0627\u0644\u0648\u0635\u0644\u0629s typically optimize the \u0627\u0644\u062e\u064a\u0637 profile, shoulder configuration, \u0627\u0644\u062e\u062a\u0645ing structure and \u0627\u0644\u0648\u0635\u0644\u0629 geometry. These improvements help reduce stress coNCentration at critical areas and provide better \u0627\u0644\u0623\u062f\u0627\u0621 in high-angle \u0627\u0644\u0628\u0626\u0631s, extended-reach \u0627\u0644\u062d\u0641\u0631 and high-\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 \u0627\u0644\u062d\u0641\u0631 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\">\u0645\u062a\u0645\u064a\u0632 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s are \u0627\u0644\u0631\u0626\u064a\u0633\u064aly \u0627\u062e\u062a\u064a\u0627\u0631ed when standard API \u0627\u0644\u0648\u0635\u0644\u0629s 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 \u0627\u0644\u0627\u062e\u062a\u064a\u0627\u0631 of a \u0645\u062a\u0645\u064a\u0632 \u0627\u0644\u0648\u0635\u0644\u0629 should be based on the complete \u0627\u0644\u062d\u0641\u0631 program, iNCluding \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 requirement, \u0627\u0644\u0628\u0626\u0631 profile, \u0627\u0644\u062d\u0641\u0631 fluid system, operating cycles and coMPatibility with the existing \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631.<\/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\">\u0627\u062e\u062a\u064a\u0627\u0631ing the correct \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629 requires matching the \u0627\u0644\u0648\u0635\u0644\u0629 design with actual \u0627\u0644\u062d\u0641\u0631 conditions rather than choosing only the highest \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646-rated option. The \u0627\u0644\u0648\u0635\u0644\u0629 must provide sufficient mechanical strength while \u0627\u0644\u0631\u0626\u064a\u0633\u064ataining coMPatibility with the \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631, 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\">\u0627\u0644\u0628\u0626\u0631 depth and trajectory<\/td><td class=\"has-text-align-center\" data-align=\"center\">Determines expected \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, tensile loading and \u0627\u0644\u062a\u0639\u0628 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 \u0627\u0644\u0648\u0635\u0644\u0629 size, \u0627\u0644\u0648\u0635\u0644\u0629 clearaNCe and coMPatibility<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u062d\u0641\u0631 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 requirement<\/td><td class=\"has-text-align-center\" data-align=\"center\">Determines whether API or \u0645\u062a\u0645\u064a\u0632 \u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u0623\u062f\u0627\u0621 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\u0645\u062a\u0631, pressure loss and flow efficieNCy<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Directional \u0627\u0644\u062d\u0641\u0631 conditions<\/td><td class=\"has-text-align-center\" data-align=\"center\">Higher dogleg severity iNCreases cyclic stress on \u0627\u0644\u0648\u0635\u0644\u0629s<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Existing \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 coMPatibility<\/td><td class=\"has-text-align-center\" data-align=\"center\">Ensures proper \u0627\u0644\u0648\u0635\u0644\u0629 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 \u0627\u0644\u062e\u064a\u0637 inspection, gauging and acceptaNCe criteria<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">A suitable \u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u0627\u062e\u062a\u064a\u0627\u0631 balaNCes \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 capacity, \u0627\u0644\u062a\u0639\u0628 resistaNCe, hydraulic \u0627\u0644\u0623\u062f\u0627\u0621 and field coMPatibility. Over-specIFying the \u0627\u0644\u0648\u0635\u0644\u0629 can iNCrease \u0627\u0644\u062a\u0643\u0644\u0641\u0629, while under-specIFying may lead to premature \u0627\u0644\u062a\u0622\u0643\u0644, \u0627\u0644\u0648\u0635\u0644\u0629 damage or operational downtime.<\/p>\n\n<h2 class=\"wp-block-heading\">OCTAL \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629 Supply Scope<\/h2>\n\n<p class=\"wp-block-paragraph\">OCTAL provides <strong>API \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 solutions<\/strong> with various <strong>rotary shouldered \u0627\u0644\u0648\u0635\u0644\u0629<\/strong> options to meet dIFferent \u0627\u0644\u062d\u0641\u0631 requirements. The supply scope covers standard API \u0627\u0644\u0648\u0635\u0644\u0629 families, customized \u0627\u0644\u0648\u0635\u0644\u0629 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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s<\/td><td class=\"has-text-align-center\" data-align=\"center\">REG, IF, FH, and NC \u0627\u0644\u0648\u0635\u0644\u0629 options based on project requirements<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">NC \u0627\u0644\u0648\u0635\u0644\u0629 Series<\/td><td class=\"has-text-align-center\" data-align=\"center\">NC38, NC40, NC46, NC50 configurations for dIFferent \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062a\u0637\u0628\u064a\u0642s<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Special \u0627\u0644\u0648\u0635\u0644\u0629 Solutions<\/td><td class=\"has-text-align-center\" data-align=\"center\">Customized \u0627\u0644\u0648\u0635\u0644\u0629 designs for demanding \u0627\u0644\u062d\u0641\u0631 conditions<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u062c\u0648\u062f\u0629 Control<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u062e\u064a\u0637 inspection, dimensional verIFication, and product traceability<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">OCTAL supports \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0627\u062e\u062a\u064a\u0627\u0631 and supply by considering \u0627\u0644\u0648\u0635\u0644\u0629 type, \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 coMPatibility, 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\/ar\/%d8%a7%d8%aa%d8%b5%d9%84-%d8%a8%d9%86%d8%a7\/\">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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0646\u0648\u0639 \u0627\u0644\u062e\u064a\u0637s iNClude REG, IF, FH, and NC \u0627\u0644\u0648\u0635\u0644\u0629s. Modern \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631s commonly use NC \u0627\u0644\u0648\u0635\u0644\u0629 families because of their standardized design and broad \u0627\u0644\u062a\u0637\u0628\u064a\u0642 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 \u0627\u0644\u0645\u0642\u0627\u0631\u0646\u0629s relate NC50 with certain older IF \u0627\u0644\u0648\u0635\u0644\u0629 sizes, they are dIFferent \u0627\u0644\u0648\u0635\u0644\u0629 designs. Actual coMPatibility requires verIFication of \u0627\u0644\u062e\u064a\u0637 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 \u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u062e\u064a\u0637ing and gauging requirements are covered by API Spec 7-2. \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 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 \u0627\u0644\u0648\u0635\u0644\u0629 types should not be connected unless coMPatibility has been specIFically verIFied. Proper matching requires confirmation of \u0627\u0644\u062e\u064a\u0637 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\/ar\/%d9%85%d8%a7-%d9%87%d9%8a-the-%d8%a7%d9%84%d8%b1%d8%a6%d9%8a%d8%b3%d9%8a-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-%d9%86%d9%88%d8%b9-%d8%a7%d9%84%d8%ae%d9%8a%d8%b7s\/\" class=\"more-link\">Read more<span class=\"screen-reader-text\"> &#8220;\u0645\u0627 \u0647\u064a the \u0627\u0644\u0631\u0626\u064a\u0633\u064a \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0646\u0648\u0639 \u0627\u0644\u062e\u064a\u0637s?&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":15994,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[105],"tags":[],"class_list":["post-15989","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-105"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u0645\u0627 \u0647\u064a the \u0627\u0644\u0631\u0626\u064a\u0633\u064a \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0646\u0648\u0639 \u0627\u0644\u062e\u064a\u0637s? - Octal<\/title>\n<meta name=\"description\" content=\"\u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0646\u0648\u0639 \u0627\u0644\u062e\u064a\u0637s cover REG, IF, FH and NC rotary shouldered \u0627\u0644\u0648\u0635\u0644\u0629s, explaining 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