{"id":15647,"date":"2026-08-14T18:26:40","date_gmt":"2026-08-14T10:26:40","guid":{"rendered":"https:\/\/www.drillpipes.com\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/"},"modified":"2026-09-18T15:59:44","modified_gmt":"2026-09-18T07:59:44","slug":"what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba","status":"publish","type":"post","link":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/","title":{"rendered":"What Size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Choosing the correct \u0434\u043e\u043b\u043e\u0442\u043e size before using a <strong>1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a<\/strong> is essential for creating accurate internal \u0440\u0435\u0437\u044c\u0431\u0430s and achieving reliable sealing performance. For the commonly used <strong>1\/8-27 NPT \u043c\u0435\u0442\u0447\u0438\u043a<\/strong>, the recommended \u0434\u043e\u043b\u043e\u0442\u043e size is <strong>11\/32 \u0434\u044e\u0439\u043c (8.73 mm)<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\">The correct <strong>1\/8 NPT \u043c\u0435\u0442\u0447\u0438\u043a \u0431\u0443\u0440 size<\/strong> depends on the \u0440\u0435\u0437\u044c\u0431\u0430 \u0441\u0432\u0435\u0447\u0430ard, material type, and required \u0440\u0435\u0437\u044c\u0431\u0430 engagement. Using the wrong \u0431\u0443\u0440 dia\u043c\u0435\u0442\u0440 may result in damaged \u0440\u0435\u0437\u044c\u0431\u0430s, poor fitting accuracy, or reduced sealing performance.<\/p>\n\n<p class=\"wp-block-paragraph\">Although NPT \u0440\u0435\u0437\u044c\u0431\u0430s are widely used for industrial fittings, hydraulic systems, and instrumentation \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s, other industries use different \u0440\u0435\u0437\u044c\u0431\u0430ed \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 systems. For example, \u043d\u0435\u0444\u0442\u044c and \u0433\u0430\u0437 \u0431\u0443\u0440\u0435\u043d\u0438\u0435 equipment relies on specialized <strong>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<\/strong> and different <strong>\u0431\u0443\u0440 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 types<\/strong> designed for high \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and demanding \u0431\u0443\u0440\u0435\u043d\u0438\u0435 conditions.<\/p>\n\n<h2 class=\"wp-block-heading\">What Size \u0434\u043e\u043b\u043e\u0442\u043e Is Required for a 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a?<\/h2>\n\n<p class=\"wp-block-paragraph\">For a \u0441\u0432\u0435\u0447\u0430ard <strong>1\/8-27 NPT \u043c\u0435\u0442\u0447\u0438\u043a<\/strong>, the recommended \u0434\u043e\u043b\u043e\u0442\u043e size is:<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u0440\u0435\u0437\u044c\u0431\u0430 Specification<\/th><th>\u0434\u043e\u043b\u043e\u0442\u043e Size<\/th><th>Decimal Size<\/th><th>Metric Size<\/th><\/tr><\/thead><tbody><tr><td>1\/8-27 NPT<\/td><td>11\/32 \u0434\u044e\u0439\u043c<\/td><td>0.34375 \u0434\u044e\u0439\u043c<\/td><td>8.73 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">The 11\/32 \u0434\u044e\u0439\u043c \u0434\u043e\u043b\u043e\u0442\u043e creates the correct pilot \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 before \u043c\u0435\u0442\u0447\u0438\u043aping. This allows the \u043c\u0435\u0442\u0447\u0438\u043a to form the \u043c\u0435\u0442\u0447\u0438\u043aered internal \u0440\u0435\u0437\u044c\u0431\u0430 profile with proper material engagement.<\/p>\n\n<p class=\"wp-block-paragraph\">Using an incorrect \u0431\u0443\u0440 size can affect \u0440\u0435\u0437\u044c\u0431\u0430 quality:<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Condition<\/th><th>Result<\/th><\/tr><\/thead><tbody><tr><td>\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 dia\u043c\u0435\u0442\u0440 too small<\/td><td>Higher cutting force, increased risk of \u043c\u0435\u0442\u0447\u0438\u043a breakage<\/td><\/tr><tr><td>\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 dia\u043c\u0435\u0442\u0440 too large<\/td><td>Reduced \u0440\u0435\u0437\u044c\u0431\u0430 engagement and weaker sealing<\/td><\/tr><tr><td>Wrong \u0440\u0435\u0437\u044c\u0431\u0430 \u0441\u0432\u0435\u0447\u0430ard<\/td><td>Improper \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and possible leakage<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">The \u201c1\/8\u201d designation refers to the nominal \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 size, not the actual \u0431\u0443\u0440 dia\u043c\u0435\u0442\u0440. The correct \u0434\u043e\u043b\u043e\u0442\u043e size must always be selected according to the \u043c\u0435\u0442\u0447\u0438\u043a specification.<\/p>\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"819\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/1-8-pipe-thread-tap-drill-bit-workpiece-1024x819.jpg\" alt=\"\" class=\"wp-image-14240\" style=\"aspect-ratio:1.2503130791965136;width:730px;height:auto\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/1-8-pipe-thread-tap-drill-bit-workpiece-1024x819.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/1-8-pipe-thread-tap-drill-bit-workpiece-300x240.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/1-8-pipe-thread-tap-drill-bit-workpiece.jpg 1402w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">Under\u0441\u0432\u0435\u0447\u0430ing 1\/8 NPT \u043c\u0435\u0442\u0447\u0438\u043a \u0431\u0443\u0440 Size<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>NPT (National Pipe Thread)<\/strong> is a tapered pipe thread standard commonly used in industrial piping, hydraulic equipment, pneumatic systems, and instrumentation applications.<\/p>\n\n<p class=\"wp-block-paragraph\">Unlike straight machine \u0440\u0435\u0437\u044c\u0431\u0430s, NPT \u0440\u0435\u0437\u044c\u0431\u0430s gradually increase in dia\u043c\u0435\u0442\u0440 along the \u0440\u0435\u0437\u044c\u0431\u0430 length. This \u043c\u0435\u0442\u0447\u0438\u043aered design allows the male and female \u0440\u0435\u0437\u044c\u0431\u0430s to create a tight \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 when properly installed.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Para\u043c\u0435\u0442\u0440<\/th><th>Specification<\/th><\/tr><\/thead><tbody><tr><td>\u0440\u0435\u0437\u044c\u0431\u0430 \u0441\u0432\u0435\u0447\u0430ard<\/td><td>NPT<\/td><\/tr><tr><td>Nominal Size<\/td><td>1\/8 \u0434\u044e\u0439\u043c<\/td><\/tr><tr><td>\u0440\u0435\u0437\u044c\u0431\u0430 Type<\/td><td>\u043c\u0435\u0442\u0447\u0438\u043aered \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430<\/td><\/tr><tr><td>\u0440\u0435\u0437\u044c\u0431\u0430s Per \u0434\u044e\u0439\u043c<\/td><td>27 TPI<\/td><\/tr><tr><td>\u0440\u0435\u0437\u044c\u0431\u0430 Angle<\/td><td>60\u00b0<\/td><\/tr><tr><td>Recommended \u0431\u0443\u0440 Size<\/td><td>11\/32 \u0434\u044e\u0439\u043c (8.73 mm)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/1-8-27-npt-internal-thread-cutaway-diagram-1024x768.jpg\" alt=\"\" class=\"wp-image-14241\" style=\"width:753px;height:auto\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/1-8-27-npt-internal-thread-cutaway-diagram-1024x768.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/1-8-27-npt-internal-thread-cutaway-diagram-300x225.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/1-8-27-npt-internal-thread-cutaway-diagram.jpg 1448w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">1\/8 NPT \u0434\u043e\u043b\u043e\u0442\u043e Size and \u0440\u0435\u0437\u044c\u0431\u0430 Dimensions<\/h2>\n\n<p class=\"wp-block-paragraph\">A common mistake is assuming that a 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 requires a 1\/8 \u0434\u044e\u0439\u043c \u0434\u043e\u043b\u043e\u0442\u043e. \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 sizes are nominal designations and do not represent the actual machined \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 dia\u043c\u0435\u0442\u0440.<\/p>\n\n<p class=\"wp-block-paragraph\">Typical NPT \u0440\u0435\u0437\u044c\u0431\u0430 dimensions include:<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Nominal \u0440\u0435\u0437\u044c\u0431\u0430 Size<\/th><th>Approximate External Dia\u043c\u0435\u0442\u0440<\/th><\/tr><\/thead><tbody><tr><td>1\/8 NPT<\/td><td>10.3 mm<\/td><\/tr><tr><td>1\/4 NPT<\/td><td>13.7 mm<\/td><\/tr><tr><td>3\/8 NPT<\/td><td>17.1 mm<\/td><\/tr><tr><td>1\/2 NPT<\/td><td>21.3 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">The \u0434\u043e\u043b\u043e\u0442\u043e size is determined by the \u043c\u0435\u0442\u0447\u0438\u043a requirements rather than the nominal \u0442\u0440\u0443\u0431\u0430 size.<\/p>\n\n<h2 class=\"wp-block-heading\">NPT \u043c\u0435\u0442\u0447\u0438\u043a \u0431\u0443\u0440 Size Chart<\/h2>\n\n<p class=\"wp-block-paragraph\">The following chart provides common NPT \u0431\u0443\u0440\u0435\u043d\u0438\u0435 references.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>NPT Size<\/th><th>\u0440\u0435\u0437\u044c\u0431\u0430s Per \u0434\u044e\u0439\u043c<\/th><th>Recommended \u0431\u0443\u0440 Size<\/th><th>Metric Equivalent<\/th><\/tr><\/thead><tbody><tr><td>1\/16-27 NPT<\/td><td>27<\/td><td>18\/64 \u0434\u044e\u0439\u043c<\/td><td>7.14 mm<\/td><\/tr><tr><td>1\/8-27 NPT<\/td><td>27<\/td><td>11\/32 \u0434\u044e\u0439\u043c<\/td><td>8.73 mm<\/td><\/tr><tr><td>1\/4-18 NPT<\/td><td>18<\/td><td>7\/16 \u0434\u044e\u0439\u043c<\/td><td>11.11 mm<\/td><\/tr><tr><td>3\/8-18 NPT<\/td><td>18<\/td><td>37\/64 \u0434\u044e\u0439\u043c<\/td><td>14.68 mm<\/td><\/tr><tr><td>1\/2-14 NPT<\/td><td>14<\/td><td>23\/32 \u0434\u044e\u0439\u043c<\/td><td>18.25 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">The recommended \u0431\u0443\u0440\u0435\u043d\u0438\u0435 size may vary slightly depending on the workpiece material, machining method, and required \u0440\u0435\u0437\u044c\u0431\u0430 depth. For precision applications, always follow the \u043c\u0435\u0442\u0447\u0438\u043a manufacturer&#8217;s recommendations.<\/p>\n\n<h2 class=\"wp-block-heading\">How to \u0431\u0443\u0440 and \u043c\u0435\u0442\u0447\u0438\u043a a 1\/8 NPT \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430<\/h2>\n\n<p class=\"wp-block-paragraph\">Creating a reliable \u0440\u0435\u0437\u044c\u0431\u0430ed \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 requires correct \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 preparation, proper tooling, and controlled \u043c\u0435\u0442\u0447\u0438\u043aping procedures.<\/p>\n\n<h3 class=\"wp-block-heading\">Step 1: Select the Correct \u0434\u043e\u043b\u043e\u0442\u043e<\/h3>\n\n<p class=\"wp-block-paragraph\">Choose an <strong>11\/32 \u0434\u044e\u0439\u043c (8.73 mm) \u0434\u043e\u043b\u043e\u0442\u043e<\/strong> for a <strong>1\/8-27 NPT \u043c\u0435\u0442\u0447\u0438\u043a<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\">Before \u0431\u0443\u0440\u0435\u043d\u0438\u0435, check:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>\u0434\u043e\u043b\u043e\u0442\u043e dia\u043c\u0435\u0442\u0440<\/li>\n\n\n\n<li>Co\u041c\u041f\u0430tibility with the workpiece material<\/li>\n\n\n\n<li>Cutting edge condition<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">A worn or unsuitable \u0434\u043e\u043b\u043e\u0442\u043e can create an inaccurate \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 and affect the final \u0440\u0435\u0437\u044c\u0431\u0430 quality.<\/p>\n\n<h3 class=\"wp-block-heading\">Step 2: \u0431\u0443\u0440 the Pilot \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430<\/h3>\n\n<p class=\"wp-block-paragraph\">The pilot \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 must be \u0431\u0443\u0440ed accurately before \u043c\u0435\u0442\u0447\u0438\u043aping.<\/p>\n\n<p class=\"wp-block-paragraph\">Recommended practices:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Mark the \u0431\u0443\u0440\u0435\u043d\u0438\u0435 position.<\/li>\n\n\n\n<li>Use a center punch when necessary.<\/li>\n\n\n\n<li>\u0431\u0443\u0440 to the required depth.<\/li>\n\n\n\n<li>Remove chips and debris before \u043c\u0435\u0442\u0447\u0438\u043aping.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">A clean and straight pilot \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 reduces \u043c\u0435\u0442\u0447\u0438\u043aping resistance and improves \u0440\u0435\u0437\u044c\u0431\u0430 accuracy.<\/p>\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/1-8-npt-hole-drilling-and-tapping-process-1024x768.jpg\" alt=\"\" class=\"wp-image-14242\" style=\"width:811px;height:auto\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/1-8-npt-hole-drilling-and-tapping-process-1024x768.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/1-8-npt-hole-drilling-and-tapping-process-300x225.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/1-8-npt-hole-drilling-and-tapping-process.jpg 1448w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<h3 class=\"wp-block-heading\">Step 3: Apply Cutting Lubricant<\/h3>\n\n<p class=\"wp-block-paragraph\">Proper lubrication improves machining performance by reducing \u0442\u0440\u0435\u043d\u0438\u0435 and heat generation.<\/p>\n\n<p class=\"wp-block-paragraph\">Cutting lubricant helps reduce:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Cutting resistance<\/li>\n\n\n\n<li>Tool \u0438\u0437\u043d\u043e\u0441<\/li>\n\n\n\n<li>Heat buildup<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Lubrication is especially important when machining:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Stainless steel<\/li>\n\n\n\n<li>Alloy steel<\/li>\n\n\n\n<li>Hardened materials<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\">Step 4: \u043c\u0435\u0442\u0447\u0438\u043a the NPT \u0440\u0435\u0437\u044c\u0431\u0430<\/h3>\n\n<p class=\"wp-block-paragraph\">Insert the <strong>1\/8 NPT \u043c\u0435\u0442\u0447\u0438\u043a<\/strong> into the \u0431\u0443\u0440ed \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 and cut the internal \u0440\u0435\u0437\u044c\u0431\u0430 gradually.<\/p>\n\n<p class=\"wp-block-paragraph\">During \u043c\u0435\u0442\u0447\u0438\u043aping:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Keep the \u043c\u0435\u0442\u0447\u0438\u043a aligned with the \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430.<\/li>\n\n\n\n<li>Reverse periodically to break chips.<\/li>\n\n\n\n<li>Avoid excessive force.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Incorrect alignment may damage the \u0440\u0435\u0437\u044c\u0431\u0430 profile and affect \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 performance.<\/p>\n\n<h3 class=\"wp-block-heading\">Step 5: Inspect the Finished \u0440\u0435\u0437\u044c\u0431\u0430<\/h3>\n\n<p class=\"wp-block-paragraph\">After \u043c\u0435\u0442\u0447\u0438\u043aping, inspect the finished \u0440\u0435\u0437\u044c\u0431\u0430 to confirm quality.<\/p>\n\n<p class=\"wp-block-paragraph\">Check:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>\u0440\u0435\u0437\u044c\u0431\u0430 appearance<\/li>\n\n\n\n<li>\u0440\u0435\u0437\u044c\u0431\u0430 depth<\/li>\n\n\n\n<li>\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 fit<\/li>\n\n\n\n<li>Sealing performance<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">For critical industrial applications, \u0440\u0435\u0437\u044c\u0431\u0430 gauges can be used to verify \u0440\u0435\u0437\u044c\u0431\u0430 accuracy.<\/p>\n\n<h2 class=\"wp-block-heading\">\u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u0441\u0432\u0435\u0447\u0430ards Used in Industrial Applications<\/h2>\n\n<p class=\"wp-block-paragraph\">NPT is only one type of industrial \u0440\u0435\u0437\u044c\u0431\u0430 \u0441\u0432\u0435\u0447\u0430ard. Different industries use different \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 systems depending on operating conditions.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u0441\u0432\u0435\u0447\u0430ard<\/th><th>Description<\/th><th>Common Applications<\/th><\/tr><\/thead><tbody><tr><td>NPT<\/td><td>American \u043c\u0435\u0442\u0447\u0438\u043aered \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430<\/td><td>Hydraulic fittings, pneumatic systems, instrumentation<\/td><\/tr><tr><td>BSPT<\/td><td>British \u043c\u0435\u0442\u0447\u0438\u043aered \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430<\/td><td>Industrial piping systems<\/td><\/tr><tr><td>BSPP<\/td><td>British parallel \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430<\/td><td>Hydraulic and equipment \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">Before machining or replacing \u0440\u0435\u0437\u044c\u0431\u0430ed components, confirming the correct \u0440\u0435\u0437\u044c\u0431\u0430 \u0441\u0432\u0435\u0447\u0430ard is essential because similar nominal sizes may use different \u0440\u0435\u0437\u044c\u0431\u0430 profiles.<\/p>\n\n<h2 class=\"wp-block-heading\">How \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s Differ from 1\/8 NPT \u0440\u0435\u0437\u044c\u0431\u0430s<\/h2>\n\n<p class=\"wp-block-paragraph\">The <strong>11\/32 \u0434\u044e\u0439\u043c \u0434\u043e\u043b\u043e\u0442\u043e<\/strong> discussed above applies to preparing a \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 for a <strong>1\/8-27 NPT \u043c\u0435\u0442\u0447\u0438\u043a<\/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 use a different design system and should not be selected from an NPT \u043c\u0435\u0442\u0447\u0438\u043a \u0431\u0443\u0440 chart.<\/p>\n\n<p class=\"wp-block-paragraph\">NPT \u0440\u0435\u0437\u044c\u0431\u0430s are commonly used for small piping, fittings, hydraulic ports, and instrumentation \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s. \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430, by contrast, connects individual \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s of the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 and must transfer \u0440\u043e\u0442\u043e\u0440 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and axial load while allowing \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 to pass through the \u043a\u043e\u043b\u043e\u043d\u043d\u0430. API Specification 5DP covers steel \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 with upset \u0442\u0440\u0443\u0431\u0430-body ends and weld-on \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s, while API Specification 7-2 addresses the \u0440\u0435\u0437\u044c\u0431\u0430ing and gauging of \u0440\u043e\u0442\u043e\u0440 shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s used on \u0431\u0443\u0440\u0435\u043d\u0438\u0435 equipment.<\/p>\n\n<p class=\"wp-block-paragraph\">This difference changes what engineers need to specify. A 1\/8 NPT \u0440\u0435\u0437\u044c\u0431\u0430ed \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 is primarily controlled by \u043c\u0435\u0442\u0447\u0438\u043a size, pilot-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 dia\u043c\u0435\u0442\u0440, \u0440\u0435\u0437\u044c\u0431\u0430 depth, and machining condition. <strong>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<\/strong> are selected as part of the complete \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Selection Item<\/th><th>1\/8-27 NPT \u0440\u0435\u0437\u044c\u0431\u0430<\/th><th>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \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<\/th><\/tr><\/thead><tbody><tr><td>Main Function<\/td><td>Fluid or instrumentation \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><td>Connect \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s in the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430<\/td><\/tr><tr><td>\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 System<\/td><td>\u043c\u0435\u0442\u0447\u0438\u043aered \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430<\/td><td>\u0440\u043e\u0442\u043e\u0440 shouldered pin-and-box \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><\/tr><tr><td>Main Selection Inputs<\/td><td>\u043c\u0435\u0442\u0447\u0438\u043a size, \u0431\u0443\u0440 size, \u0440\u0435\u0437\u044c\u0431\u0430 depth, material<\/td><td>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 size, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 designation and \u0431\u0443\u0440\u0435\u043d\u0438\u0435 duty<\/td><\/tr><tr><td>Machining \/ Inspection Focus<\/td><td>Pilot-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 size, \u043c\u0435\u0442\u0447\u0438\u043aping alignment and finished \u0440\u0435\u0437\u044c\u0431\u0430<\/td><td>\u0440\u0435\u0437\u044c\u0431\u0430 geometry, shoulder condition, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 gauging and dimensional co\u041c\u041f\u0430tibility<\/td><\/tr><tr><td>Typical Service<\/td><td>Hydraulic, pneumatic and small piping systems<\/td><td>\u043d\u0435\u0444\u0442\u044c and \u0433\u0430\u0437 \u0440\u043e\u0442\u043e\u0440 \u0431\u0443\u0440\u0435\u043d\u0438\u0435<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"has-primary-color has-text-color has-link-color wp-elements-1 wp-block-paragraph\">For a \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 purchase specification, the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 therefore should not be described simply as a \u201c\u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430.\u201d Buyers normally need to identify the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 size and \u043a\u043b\u0430\u0441\u0441 together with the required \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 designation. For <strong><a href=\"__PROTECTED_0__\">API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/a><\/strong>, these \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 details form part of the overall \u0431\u0443\u0440-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 co\u041c\u041f\u0430tibility rather than a \u0441\u0432\u0435\u0447\u0430alone \u043c\u0435\u0442\u0447\u0438\u043aping operation.<\/p>\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" data-id=\"14243\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/steel-pipe-manufacturing-workshop-1024x576.jpg\" alt=\"\" class=\"wp-image-14243\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/steel-pipe-manufacturing-workshop-1024x576.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/steel-pipe-manufacturing-workshop-300x169.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/steel-pipe-manufacturing-workshop-2000x1125.jpg 2000w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" data-id=\"14244\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/drill-pipe-threaded-connection-manufacturing-1024x576.jpg\" alt=\"\" class=\"wp-image-14244\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/drill-pipe-threaded-connection-manufacturing-1024x576.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/drill-pipe-threaded-connection-manufacturing-300x169.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/drill-pipe-threaded-connection-manufacturing-2000x1125.jpg 2000w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n\n<h2 class=\"wp-block-heading\">\u0431\u0443\u0440 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 Types and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 Selection<\/h2>\n\n<p class=\"wp-block-paragraph\">The term <strong>\u0431\u0443\u0440 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 types<\/strong> usually refers to the \u0440\u043e\u0442\u043e\u0440 shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s machined into the \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s at the ends of the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430. One end provides the pin \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and the other the box \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435. During make-up, the \u0440\u0435\u0437\u044c\u0431\u0430ed \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 draws the \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s together and the shoulders form the controlled contact interface required for \u0431\u0443\u0440\u0435\u043d\u0438\u0435 service.<\/p>\n\n<p class=\"wp-block-paragraph\">API 7-2 defines dimensional and gauging requirements for \u0440\u043e\u0442\u043e\u0440 shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s. The \u0441\u0432\u0435\u0447\u0430ard includes NC \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s and also addresses other established \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 forms, including IF and FH designations. Some older IF and FH sizes correspond to specified NC \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s, so the exact designation and dimensions should be checked rather than assuming that all names describe completely separate \u0440\u0435\u0437\u044c\u0431\u0430 systems.<\/p>\n\n<p class=\"wp-block-paragraph\">When reviewing 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, engineers typically consider:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>co\u041c\u041f\u0430tibility with the existing \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 and crossover subs;<\/li>\n\n\n\n<li>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043d\u0430\u0440\u0443\u0436\u043d\u044b\u0439 \u0434\u0438\u0430\u043c\u0435\u0442\u0440 and wall section;<\/li>\n\n\n\n<li>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 outside and \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0438\u0439 \u0434\u0438\u0430\u043c\u0435\u0442\u0440s;<\/li>\n\n\n\n<li>required \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and axial-load performance;<\/li>\n\n\n\n<li>internal flow area for \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440;<\/li>\n\n\n\n<li>pin, box, \u0440\u0435\u0437\u044c\u0431\u0430, and shoulder condition;<\/li>\n\n\n\n<li>repeated make-up and break-out requirements.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">These factors explain why <strong>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<\/strong> cannot be selected using the same logic as a 1\/8 NPT \u043c\u0435\u0442\u0447\u0438\u043a. The \u0440\u0435\u0437\u044c\u0431\u0430 is only one part of the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435; \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry and co\u041c\u041f\u0430tibility with the \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u043a\u043e\u043b\u043e\u043d\u043d\u0430 are equally important.<\/p>\n\n<p class=\"wp-block-paragraph\">For buyers co\u041c\u041f\u0430ring \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 specifications, <strong>API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong> provides the natural point for checking \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441, dimensions, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 configuration, and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 requirements together rather than treating the \u0440\u0435\u0437\u044c\u0431\u0430 as an isolated machining detail.<\/p>\n\n<p class=\"wp-block-paragraph\">The distinction is important before returning to the o\u0431\u0443\u0440\u043e\u0432\u0430\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430inal \u043c\u0435\u0442\u0447\u0438\u043aping question: <strong>1\/8 NPT \u0434\u043e\u043b\u043e\u0442\u043e selection applies to a machined NPT port, not to \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0440\u0435\u0437\u044c\u0431\u0430s.<\/strong> For a 1\/8 NPT \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430, \u0431\u0443\u0440 dia\u043c\u0435\u0442\u0440, \u043c\u0435\u0442\u0447\u0438\u043aping alignment, \u0440\u0435\u0437\u044c\u0431\u0430 depth, and confirmation of the correct \u0442\u0440\u0443\u0431\u0430-\u0440\u0435\u0437\u044c\u0431\u0430 \u0441\u0432\u0435\u0447\u0430ard remain the primary machining controls.<\/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_Connections_Engineering_Reference-1.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 API Drill Pipe Connections Engineering Reference\"><\/object><a id=\"wp-block-file--media-85f709d7-c74e-42cc-8975-5d0feebf4e39\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/API_Drill_Pipe_Connections_Engineering_Reference-1.pdf\">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 Engineering Reference<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/API_Drill_Pipe_Connections_Engineering_Reference-1.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-85f709d7-c74e-42cc-8975-5d0feebf4e39\">Download<\/a><\/div>\n\n<h2 class=\"wp-block-heading\">Common Mistakes When Selecting \u0434\u043e\u043b\u043e\u0442\u043es for \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043aping<\/h2>\n\n<h3 class=\"wp-block-heading\">Using the Wrong \u0440\u0435\u0437\u044c\u0431\u0430 \u0441\u0432\u0435\u0447\u0430ard<\/h3>\n\n<p class=\"wp-block-paragraph\">A 1\/8 NPT \u043c\u0435\u0442\u0447\u0438\u043a cannot be directly replaced with BSPT or BSPP tooling because the \u0440\u0435\u0437\u044c\u0431\u0430 geometry is different.<\/p>\n\n<h3 class=\"wp-block-heading\">Selecting the Wrong \u0434\u043e\u043b\u043e\u0442\u043e Size<\/h3>\n\n<p class=\"wp-block-paragraph\">Incorrect \u0431\u0443\u0440\u0435\u043d\u0438\u0435 dimensions may cause:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Poor \u0440\u0435\u0437\u044c\u0431\u0430 engagement<\/li>\n\n\n\n<li>Increased machining force<\/li>\n\n\n\n<li>Reduced sealing performance<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\">Confusing \u0442\u0440\u0443\u0431\u0430 Size With Actual Dia\u043c\u0435\u0442\u0440<\/h3>\n\n<p class=\"wp-block-paragraph\">The nominal \u0442\u0440\u0443\u0431\u0430 size does not indicate the required \u0431\u0443\u0440 dia\u043c\u0435\u0442\u0440. Always check the correct \u043c\u0435\u0442\u0447\u0438\u043a \u0431\u0443\u0440 size before machining.<\/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\">FAQ<\/h2>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q: What size drill bit do I need for a 1\/8 pipe thread tap?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\"><strong>A:<\/strong> A standard 1\/8-27 NPT tap requires an 11\/32 inch (8.73 mm) drill bit for the pilot hole before tapping.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q: Is 1\/8 pipe thread the same as 1\/8 NPT?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\"><strong>A:<\/strong> Not always. 1\/8 pipe thread may refer to different standards, including NPT, BSPT, and BSPP. The thread specification should be confirmed before machining.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q: What are API drill pipe connections used for?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\"><strong>A:<\/strong> API drill pipe connections are used in oil and gas drilling strings. They are designed to handle high torque, axial loads, and repeated drilling operations.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q: What is the difference between NPT threads and drill pipe thread types?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\"><strong>A:<\/strong> NPT threads are mainly used for industrial piping and fittings, while drill pipe thread types are specialized oilfield connections designed for drilling loads and tool joint performance.<\/p>\n<\/details>\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>Choosing the correct \u0434\u043e\u043b\u043e\u0442\u043e size before using a 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a is essential for creating accurate internal \u0440\u0435\u0437\u044c\u0431\u0430s and achieving reliable sealing performance. For the commonly used 1\/8-27 NPT \u043c\u0435\u0442\u0447\u0438\u043a, the recommended \u0434\u043e\u043b\u043e\u0442\u043e size is 11\/32 \u0434\u044e\u0439\u043c (8.73 mm). The correct 1\/8 NPT \u043c\u0435\u0442\u0447\u0438\u043a \u0431\u0443\u0440 size depends on the \u0440\u0435\u0437\u044c\u0431\u0430 \u0441\u0432\u0435\u0447\u0430ard, material type, and &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/\" class=\"more-link\">\u0427\u0438\u0442\u0430\u0442\u044c \u0434\u0430\u043b\u0435\u0435<span class=\"screen-reader-text\"> &#171;What Size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a?&#187;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":15650,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[106],"tags":[],"class_list":["post-15647","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>What Size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a? Drillpipes -<\/title>\n<meta name=\"description\" content=\"What size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a? Use a Letter Q \u0431\u0443\u0440 (0.332 in \/ 8.43 mm) for 1\/8-27 NPT, with \u043c\u0435\u0442\u0447\u0438\u043aping steps and \u0431\u0443\u0440 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 differences.\" \/>\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\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/\" \/>\n<meta property=\"og:locale\" content=\"ru_RU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a? Drillpipes -\" \/>\n<meta property=\"og:description\" content=\"What size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a? Use a Letter Q \u0431\u0443\u0440 (0.332 in \/ 8.43 mm) for 1\/8-27 NPT, with \u043c\u0435\u0442\u0447\u0438\u043aping steps and \u0431\u0443\u0440 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 differences.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/\" \/>\n<meta property=\"og:site_name\" content=\"Drillpipes\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/kevin.wen.3990\/yoast\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-14T10:26:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-18T07:59:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/what-size-drill-bit-for-1-8-pipe-thread-tap-1024x689.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"689\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Lynx Bai\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u041d\u0430\u043f\u0438\u0441\u0430\u043d\u043e \u0430\u0432\u0442\u043e\u0440\u043e\u043c\" \/>\n\t<meta name=\"twitter:data1\" content=\"Lynx Bai\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u041f\u0440\u0438\u043c\u0435\u0440\u043d\u043e\u0435 \u0432\u0440\u0435\u043c\u044f \u0434\u043b\u044f \u0447\u0442\u0435\u043d\u0438\u044f\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 \u043c\u0438\u043d\u0443\u0442\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/\"},\"author\":{\"name\":\"Lynx Bai\",\"@id\":\"https:\/\/www.drillpipes.com\/ru\/#\/schema\/person\/f813bbf4962cabb7ae7583f03f51bd2e\"},\"headline\":\"What Size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a?\",\"datePublished\":\"2026-08-14T10:26:40+00:00\",\"dateModified\":\"2026-09-18T07:59:44+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/\"},\"wordCount\":1626,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.drillpipes.com\/ru\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/what-size-drill-bit-for-1-8-pipe-thread-tap.png\",\"articleSection\":[\"\u0411\u043b\u043e\u0433\"],\"inLanguage\":\"ru-RU\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/\",\"url\":\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/\",\"name\":\"What Size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a? Drillpipes -\",\"isPartOf\":{\"@id\":\"https:\/\/www.drillpipes.com\/ru\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/what-size-drill-bit-for-1-8-pipe-thread-tap.png\",\"datePublished\":\"2026-08-14T10:26:40+00:00\",\"dateModified\":\"2026-09-18T07:59:44+00:00\",\"description\":\"What size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a? Use a Letter Q \u0431\u0443\u0440 (0.332 in \/ 8.43 mm) for 1\/8-27 NPT, with \u043c\u0435\u0442\u0447\u0438\u043aping steps and \u0431\u0443\u0440 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 differences.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#breadcrumb\"},\"inLanguage\":\"ru-RU\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"ru-RU\",\"@id\":\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#primaryimage\",\"url\":\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/what-size-drill-bit-for-1-8-pipe-thread-tap.png\",\"contentUrl\":\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/what-size-drill-bit-for-1-8-pipe-thread-tap.png\",\"width\":1529,\"height\":1029},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.drillpipes.com\/ru\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What Size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.drillpipes.com\/ru\/#website\",\"url\":\"https:\/\/www.drillpipes.com\/ru\/\",\"name\":\"Drillpipes\",\"description\":\"Drill Pipe Supplier for Oil &amp; Gas Drilling | OCTAL\",\"publisher\":{\"@id\":\"https:\/\/www.drillpipes.com\/ru\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.drillpipes.com\/ru\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"ru-RU\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.drillpipes.com\/ru\/#organization\",\"name\":\"Drillpipes\",\"url\":\"https:\/\/www.drillpipes.com\/ru\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ru-RU\",\"@id\":\"https:\/\/www.drillpipes.com\/ru\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/03\/drill-pipe-octal-logo.png\",\"contentUrl\":\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/03\/drill-pipe-octal-logo.png\",\"width\":1134,\"height\":378,\"caption\":\"Drillpipes\"},\"image\":{\"@id\":\"https:\/\/www.drillpipes.com\/ru\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.facebook.com\/kevin.wen.3990\/yoast\",\"https:\/\/www.youtube.com\/@octalsteel\/yoast\",\"https:\/\/www.linkedin.com\/company\/octalsteel\/yoast\",\"https:\/\/www.tiktok.com\/@octalsteel\/yoast\"]},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.drillpipes.com\/ru\/#\/schema\/person\/f813bbf4962cabb7ae7583f03f51bd2e\",\"name\":\"Lynx Bai\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ru-RU\",\"@id\":\"https:\/\/www.drillpipes.com\/ru\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/fae3fe4bee4b43be4ff236a08fa35d8f059e06f563d67572b0867f1a53d63e55?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/fae3fe4bee4b43be4ff236a08fa35d8f059e06f563d67572b0867f1a53d63e55?s=96&d=mm&r=g\",\"caption\":\"Lynx Bai\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"What Size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a? Drillpipes -","description":"What size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a? Use a Letter Q \u0431\u0443\u0440 (0.332 in \/ 8.43 mm) for 1\/8-27 NPT, with \u043c\u0435\u0442\u0447\u0438\u043aping steps and \u0431\u0443\u0440 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 differences.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/","og_locale":"ru_RU","og_type":"article","og_title":"What Size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a? Drillpipes -","og_description":"What size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a? Use a Letter Q \u0431\u0443\u0440 (0.332 in \/ 8.43 mm) for 1\/8-27 NPT, with \u043c\u0435\u0442\u0447\u0438\u043aping steps and \u0431\u0443\u0440 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 differences.","og_url":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/","og_site_name":"Drillpipes","article_publisher":"https:\/\/www.facebook.com\/kevin.wen.3990\/yoast","article_published_time":"2026-08-14T10:26:40+00:00","article_modified_time":"2026-09-18T07:59:44+00:00","og_image":[{"width":1024,"height":689,"url":"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/what-size-drill-bit-for-1-8-pipe-thread-tap-1024x689.png","type":"image\/png"}],"author":"Lynx Bai","twitter_card":"summary_large_image","twitter_misc":{"\u041d\u0430\u043f\u0438\u0441\u0430\u043d\u043e \u0430\u0432\u0442\u043e\u0440\u043e\u043c":"Lynx Bai","\u041f\u0440\u0438\u043c\u0435\u0440\u043d\u043e\u0435 \u0432\u0440\u0435\u043c\u044f \u0434\u043b\u044f \u0447\u0442\u0435\u043d\u0438\u044f":"6 \u043c\u0438\u043d\u0443\u0442"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#article","isPartOf":{"@id":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/"},"author":{"name":"Lynx Bai","@id":"https:\/\/www.drillpipes.com\/ru\/#\/schema\/person\/f813bbf4962cabb7ae7583f03f51bd2e"},"headline":"What Size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a?","datePublished":"2026-08-14T10:26:40+00:00","dateModified":"2026-09-18T07:59:44+00:00","mainEntityOfPage":{"@id":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/"},"wordCount":1626,"commentCount":0,"publisher":{"@id":"https:\/\/www.drillpipes.com\/ru\/#organization"},"image":{"@id":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#primaryimage"},"thumbnailUrl":"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/what-size-drill-bit-for-1-8-pipe-thread-tap.png","articleSection":["\u0411\u043b\u043e\u0433"],"inLanguage":"ru-RU","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/","url":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/","name":"What Size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a? Drillpipes -","isPartOf":{"@id":"https:\/\/www.drillpipes.com\/ru\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#primaryimage"},"image":{"@id":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#primaryimage"},"thumbnailUrl":"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/what-size-drill-bit-for-1-8-pipe-thread-tap.png","datePublished":"2026-08-14T10:26:40+00:00","dateModified":"2026-09-18T07:59:44+00:00","description":"What size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a? Use a Letter Q \u0431\u0443\u0440 (0.332 in \/ 8.43 mm) for 1\/8-27 NPT, with \u043c\u0435\u0442\u0447\u0438\u043aping steps and \u0431\u0443\u0440 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 differences.","breadcrumb":{"@id":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#breadcrumb"},"inLanguage":"ru-RU","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/"]}]},{"@type":"ImageObject","inLanguage":"ru-RU","@id":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#primaryimage","url":"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/what-size-drill-bit-for-1-8-pipe-thread-tap.png","contentUrl":"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/what-size-drill-bit-for-1-8-pipe-thread-tap.png","width":1529,"height":1029},{"@type":"BreadcrumbList","@id":"https:\/\/www.drillpipes.com\/ru\/what-size-%d0%b4%d0%be%d0%bb%d0%be%d1%82%d0%be-for-1-8-%d1%82%d1%80%d1%83%d0%b1%d0%bd%d0%b0%d1%8f-%d1%80%d0%b5%d0%b7%d1%8c%d0%b1%d0%b0-%d0%bc%d0%b5%d1%82%d1%87%d0%b8%d0%ba\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.drillpipes.com\/ru\/"},{"@type":"ListItem","position":2,"name":"What Size \u0434\u043e\u043b\u043e\u0442\u043e for 1\/8 \u0442\u0440\u0443\u0431\u043d\u0430\u044f \u0440\u0435\u0437\u044c\u0431\u0430 \u043c\u0435\u0442\u0447\u0438\u043a?"}]},{"@type":"WebSite","@id":"https:\/\/www.drillpipes.com\/ru\/#website","url":"https:\/\/www.drillpipes.com\/ru\/","name":"Drillpipes","description":"Drill Pipe Supplier for Oil &amp; Gas Drilling | OCTAL","publisher":{"@id":"https:\/\/www.drillpipes.com\/ru\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.drillpipes.com\/ru\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"ru-RU"},{"@type":"Organization","@id":"https:\/\/www.drillpipes.com\/ru\/#organization","name":"Drillpipes","url":"https:\/\/www.drillpipes.com\/ru\/","logo":{"@type":"ImageObject","inLanguage":"ru-RU","@id":"https:\/\/www.drillpipes.com\/ru\/#\/schema\/logo\/image\/","url":"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/03\/drill-pipe-octal-logo.png","contentUrl":"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/03\/drill-pipe-octal-logo.png","width":1134,"height":378,"caption":"Drillpipes"},"image":{"@id":"https:\/\/www.drillpipes.com\/ru\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/kevin.wen.3990\/yoast","https:\/\/www.youtube.com\/@octalsteel\/yoast","https:\/\/www.linkedin.com\/company\/octalsteel\/yoast","https:\/\/www.tiktok.com\/@octalsteel\/yoast"]},{"@type":"Person","@id":"https:\/\/www.drillpipes.com\/ru\/#\/schema\/person\/f813bbf4962cabb7ae7583f03f51bd2e","name":"Lynx Bai","image":{"@type":"ImageObject","inLanguage":"ru-RU","@id":"https:\/\/www.drillpipes.com\/ru\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/fae3fe4bee4b43be4ff236a08fa35d8f059e06f563d67572b0867f1a53d63e55?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/fae3fe4bee4b43be4ff236a08fa35d8f059e06f563d67572b0867f1a53d63e55?s=96&d=mm&r=g","caption":"Lynx Bai"}}]}},"_links":{"self":[{"href":"https:\/\/www.drillpipes.com\/ru\/wp-json\/wp\/v2\/posts\/15647","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.drillpipes.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.drillpipes.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.drillpipes.com\/ru\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.drillpipes.com\/ru\/wp-json\/wp\/v2\/comments?post=15647"}],"version-history":[{"count":1,"href":"https:\/\/www.drillpipes.com\/ru\/wp-json\/wp\/v2\/posts\/15647\/revisions"}],"predecessor-version":[{"id":15653,"href":"https:\/\/www.drillpipes.com\/ru\/wp-json\/wp\/v2\/posts\/15647\/revisions\/15653"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.drillpipes.com\/ru\/wp-json\/wp\/v2\/media\/15650"}],"wp:attachment":[{"href":"https:\/\/www.drillpipes.com\/ru\/wp-json\/wp\/v2\/media?parent=15647"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.drillpipes.com\/ru\/wp-json\/wp\/v2\/categories?post=15647"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.drillpipes.com\/ru\/wp-json\/wp\/v2\/tags?post=15647"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}