{"id":15640,"date":"2026-08-14T18:26:40","date_gmt":"2026-08-14T10:26:40","guid":{"rendered":"https:\/\/www.drillpipes.com\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/"},"modified":"2026-09-18T15:59:28","modified_gmt":"2026-09-18T07:59:28","slug":"what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1","status":"publish","type":"post","link":"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/","title":{"rendered":"What Size \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 for 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Choosing the correct \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 size before using a <strong>1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631<\/strong> is essential for creating accurate internal \u0627\u0644\u062e\u064a\u0637s and achieving reliable sealing performance. For the commonly used <strong>1\/8-27 NPT \u0627\u0644\u0635\u0646\u0628\u0648\u0631<\/strong>, the recommended \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 size is <strong>11\/32 \u0628\u0648\u0635\u0629 (8.73 mm)<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\">The correct <strong>1\/8 NPT \u0627\u0644\u0635\u0646\u0628\u0648\u0631 \u0627\u0644\u062d\u0641\u0631 size<\/strong> depends on the \u0627\u0644\u062e\u064a\u0637 \u0627\u0644\u0634\u0639\u0644\u0629ard, material type, and required \u0627\u0644\u062e\u064a\u0637 engagement. Using the wrong \u0627\u0644\u062d\u0641\u0631 dia\u0645\u062a\u0631 may result in damaged \u0627\u0644\u062e\u064a\u0637s, poor fitting accuracy, or reduced sealing performance.<\/p>\n\n<p class=\"wp-block-paragraph\">Although NPT \u0627\u0644\u062e\u064a\u0637s are widely used for industrial fittings, hydraulic systems, and instrumentation \u0627\u0644\u0648\u0635\u0644\u0629s, other industries use different \u0627\u0644\u062e\u064a\u0637ed \u0627\u0644\u0648\u0635\u0644\u0629 systems. For example, \u0627\u0644\u0646\u0641\u0637 and \u0627\u0644\u063a\u0627\u0632 \u0627\u0644\u062d\u0641\u0631 equipment relies on specialized <strong>API \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s<\/strong> and different <strong>\u0627\u0644\u062d\u0641\u0631 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 types<\/strong> designed for high \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and demanding \u0627\u0644\u062d\u0641\u0631 conditions.<\/p>\n\n<h2 class=\"wp-block-heading\">What Size \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 Is Required for a 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631?<\/h2>\n\n<p class=\"wp-block-paragraph\">For a \u0627\u0644\u0634\u0639\u0644\u0629ard <strong>1\/8-27 NPT \u0627\u0644\u0635\u0646\u0628\u0648\u0631<\/strong>, the recommended \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 size is:<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u0627\u0644\u062e\u064a\u0637 Specification<\/th><th>\u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 Size<\/th><th>Decimal Size<\/th><th>Metric Size<\/th><\/tr><\/thead><tbody><tr><td>1\/8-27 NPT<\/td><td>11\/32 \u0628\u0648\u0635\u0629<\/td><td>0.34375 \u0628\u0648\u0635\u0629<\/td><td>8.73 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">The 11\/32 \u0628\u0648\u0635\u0629 \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 creates the correct pilot \u0627\u0644\u0628\u0626\u0631 before \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping. This allows the \u0627\u0644\u0635\u0646\u0628\u0648\u0631 to form the \u0627\u0644\u0635\u0646\u0628\u0648\u0631ered internal \u0627\u0644\u062e\u064a\u0637 profile with proper material engagement.<\/p>\n\n<p class=\"wp-block-paragraph\">Using an incorrect \u0627\u0644\u062d\u0641\u0631 size can affect \u0627\u0644\u062e\u064a\u0637 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>\u0627\u0644\u0628\u0626\u0631 dia\u0645\u062a\u0631 too small<\/td><td>Higher cutting force, increased risk of \u0627\u0644\u0635\u0646\u0628\u0648\u0631 breakage<\/td><\/tr><tr><td>\u0627\u0644\u0628\u0626\u0631 dia\u0645\u062a\u0631 too large<\/td><td>Reduced \u0627\u0644\u062e\u064a\u0637 engagement and weaker sealing<\/td><\/tr><tr><td>Wrong \u0627\u0644\u062e\u064a\u0637 \u0627\u0644\u0634\u0639\u0644\u0629ard<\/td><td>Improper \u0627\u0644\u0648\u0635\u0644\u0629 and possible leakage<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">The \u201c1\/8\u201d designation refers to the nominal \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 size, not the actual \u0627\u0644\u062d\u0641\u0631 dia\u0645\u062a\u0631. The correct \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 size must always be selected according to the \u0627\u0644\u0635\u0646\u0628\u0648\u0631 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\u0627\u0644\u0634\u0639\u0644\u0629ing 1\/8 NPT \u0627\u0644\u0635\u0646\u0628\u0648\u0631 \u0627\u0644\u062d\u0641\u0631 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 \u0627\u0644\u062e\u064a\u0637s, NPT \u0627\u0644\u062e\u064a\u0637s gradually increase in dia\u0645\u062a\u0631 along the \u0627\u0644\u062e\u064a\u0637 length. This \u0627\u0644\u0635\u0646\u0628\u0648\u0631ered design allows the male and female \u0627\u0644\u062e\u064a\u0637s to create a tight \u0627\u0644\u0648\u0635\u0644\u0629 when properly installed.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Para\u0645\u062a\u0631<\/th><th>Specification<\/th><\/tr><\/thead><tbody><tr><td>\u0627\u0644\u062e\u064a\u0637 \u0627\u0644\u0634\u0639\u0644\u0629ard<\/td><td>NPT<\/td><\/tr><tr><td>Nominal Size<\/td><td>1\/8 \u0628\u0648\u0635\u0629<\/td><\/tr><tr><td>\u0627\u0644\u062e\u064a\u0637 Type<\/td><td>\u0627\u0644\u0635\u0646\u0628\u0648\u0631ered \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628<\/td><\/tr><tr><td>\u0627\u0644\u062e\u064a\u0637s Per \u0628\u0648\u0635\u0629<\/td><td>27 TPI<\/td><\/tr><tr><td>\u0627\u0644\u062e\u064a\u0637 Angle<\/td><td>60\u00b0<\/td><\/tr><tr><td>Recommended \u0627\u0644\u062d\u0641\u0631 Size<\/td><td>11\/32 \u0628\u0648\u0635\u0629 (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 \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 Size and \u0627\u0644\u062e\u064a\u0637 Dimensions<\/h2>\n\n<p class=\"wp-block-paragraph\">A common mistake is assuming that a 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 requires a 1\/8 \u0628\u0648\u0635\u0629 \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631. \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 sizes are nominal designations and do not represent the actual machined \u0627\u0644\u0628\u0626\u0631 dia\u0645\u062a\u0631.<\/p>\n\n<p class=\"wp-block-paragraph\">Typical NPT \u0627\u0644\u062e\u064a\u0637 dimensions include:<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Nominal \u0627\u0644\u062e\u064a\u0637 Size<\/th><th>Approximate External Dia\u0645\u062a\u0631<\/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 \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 size is determined by the \u0627\u0644\u0635\u0646\u0628\u0648\u0631 requirements rather than the nominal \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 size.<\/p>\n\n<h2 class=\"wp-block-heading\">NPT \u0627\u0644\u0635\u0646\u0628\u0648\u0631 \u0627\u0644\u062d\u0641\u0631 Size Chart<\/h2>\n\n<p class=\"wp-block-paragraph\">The following chart provides common NPT \u0627\u0644\u062d\u0641\u0631 references.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>NPT Size<\/th><th>\u0627\u0644\u062e\u064a\u0637s Per \u0628\u0648\u0635\u0629<\/th><th>Recommended \u0627\u0644\u062d\u0641\u0631 Size<\/th><th>Metric Equivalent<\/th><\/tr><\/thead><tbody><tr><td>1\/16-27 NPT<\/td><td>27<\/td><td>18\/64 \u0628\u0648\u0635\u0629<\/td><td>7.14 mm<\/td><\/tr><tr><td>1\/8-27 NPT<\/td><td>27<\/td><td>11\/32 \u0628\u0648\u0635\u0629<\/td><td>8.73 mm<\/td><\/tr><tr><td>1\/4-18 NPT<\/td><td>18<\/td><td>7\/16 \u0628\u0648\u0635\u0629<\/td><td>11.11 mm<\/td><\/tr><tr><td>3\/8-18 NPT<\/td><td>18<\/td><td>37\/64 \u0628\u0648\u0635\u0629<\/td><td>14.68 mm<\/td><\/tr><tr><td>1\/2-14 NPT<\/td><td>14<\/td><td>23\/32 \u0628\u0648\u0635\u0629<\/td><td>18.25 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">The recommended \u0627\u0644\u062d\u0641\u0631 size may vary slightly depending on the workpiece material, machining method, and required \u0627\u0644\u062e\u064a\u0637 depth. For precision applications, always follow the \u0627\u0644\u0635\u0646\u0628\u0648\u0631 manufacturer&#8217;s recommendations.<\/p>\n\n<h2 class=\"wp-block-heading\">How to \u0627\u0644\u062d\u0641\u0631 and \u0627\u0644\u0635\u0646\u0628\u0648\u0631 a 1\/8 NPT \u0627\u0644\u0628\u0626\u0631<\/h2>\n\n<p class=\"wp-block-paragraph\">Creating a reliable \u0627\u0644\u062e\u064a\u0637ed \u0627\u0644\u0648\u0635\u0644\u0629 requires correct \u0627\u0644\u0628\u0626\u0631 preparation, proper tooling, and controlled \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping procedures.<\/p>\n\n<h3 class=\"wp-block-heading\">Step 1: Select the Correct \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631<\/h3>\n\n<p class=\"wp-block-paragraph\">Choose an <strong>11\/32 \u0628\u0648\u0635\u0629 (8.73 mm) \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631<\/strong> for a <strong>1\/8-27 NPT \u0627\u0644\u0635\u0646\u0628\u0648\u0631<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\">Before \u0627\u0644\u062d\u0641\u0631, check:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>\u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 dia\u0645\u062a\u0631<\/li>\n\n\n\n<li>CoMPatibility 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 \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 can create an inaccurate \u0627\u0644\u0628\u0626\u0631 and affect the final \u0627\u0644\u062e\u064a\u0637 quality.<\/p>\n\n<h3 class=\"wp-block-heading\">Step 2: \u0627\u0644\u062d\u0641\u0631 the Pilot \u0627\u0644\u0628\u0626\u0631<\/h3>\n\n<p class=\"wp-block-paragraph\">The pilot \u0627\u0644\u0628\u0626\u0631 must be \u0627\u0644\u062d\u0641\u0631ed accurately before \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping.<\/p>\n\n<p class=\"wp-block-paragraph\">Recommended practices:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Mark the \u0627\u0644\u062d\u0641\u0631 position.<\/li>\n\n\n\n<li>Use a center punch when necessary.<\/li>\n\n\n\n<li>\u0627\u0644\u062d\u0641\u0631 to the required depth.<\/li>\n\n\n\n<li>Remove chips and debris before \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">A clean and straight pilot \u0627\u0644\u0628\u0626\u0631 reduces \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping resistance and improves \u0627\u0644\u062e\u064a\u0637 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 \u0627\u0644\u0627\u062d\u062a\u0643\u0627\u0643 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 \u0627\u0644\u062a\u0622\u0643\u0644<\/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: \u0627\u0644\u0635\u0646\u0628\u0648\u0631 the NPT \u0627\u0644\u062e\u064a\u0637<\/h3>\n\n<p class=\"wp-block-paragraph\">Insert the <strong>1\/8 NPT \u0627\u0644\u0635\u0646\u0628\u0648\u0631<\/strong> into the \u0627\u0644\u062d\u0641\u0631ed \u0627\u0644\u0628\u0626\u0631 and cut the internal \u0627\u0644\u062e\u064a\u0637 gradually.<\/p>\n\n<p class=\"wp-block-paragraph\">During \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Keep the \u0627\u0644\u0635\u0646\u0628\u0648\u0631 aligned with the \u0627\u0644\u0628\u0626\u0631.<\/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 \u0627\u0644\u062e\u064a\u0637 profile and affect \u0627\u0644\u0648\u0635\u0644\u0629 performance.<\/p>\n\n<h3 class=\"wp-block-heading\">Step 5: Inspect the Finished \u0627\u0644\u062e\u064a\u0637<\/h3>\n\n<p class=\"wp-block-paragraph\">After \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping, inspect the finished \u0627\u0644\u062e\u064a\u0637 to confirm quality.<\/p>\n\n<p class=\"wp-block-paragraph\">Check:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>\u0627\u0644\u062e\u064a\u0637 appearance<\/li>\n\n\n\n<li>\u0627\u0644\u062e\u064a\u0637 depth<\/li>\n\n\n\n<li>\u0627\u0644\u0648\u0635\u0644\u0629 fit<\/li>\n\n\n\n<li>Sealing performance<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">For critical industrial applications, \u0627\u0644\u062e\u064a\u0637 gauges can be used to verify \u0627\u0644\u062e\u064a\u0637 accuracy.<\/p>\n\n<h2 class=\"wp-block-heading\">\u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0634\u0639\u0644\u0629ards Used in Industrial Applications<\/h2>\n\n<p class=\"wp-block-paragraph\">NPT is only one type of industrial \u0627\u0644\u062e\u064a\u0637 \u0627\u0644\u0634\u0639\u0644\u0629ard. Different industries use different \u0627\u0644\u0648\u0635\u0644\u0629 systems depending on operating conditions.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u0627\u0644\u0634\u0639\u0644\u0629ard<\/th><th>Description<\/th><th>Common Applications<\/th><\/tr><\/thead><tbody><tr><td>NPT<\/td><td>American \u0627\u0644\u0635\u0646\u0628\u0648\u0631ered \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628<\/td><td>Hydraulic fittings, pneumatic systems, instrumentation<\/td><\/tr><tr><td>BSPT<\/td><td>British \u0627\u0644\u0635\u0646\u0628\u0648\u0631ered \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628<\/td><td>Industrial piping systems<\/td><\/tr><tr><td>BSPP<\/td><td>British parallel \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628<\/td><td>Hydraulic and equipment \u0627\u0644\u0648\u0635\u0644\u0629s<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">Before machining or replacing \u0627\u0644\u062e\u064a\u0637ed components, confirming the correct \u0627\u0644\u062e\u064a\u0637 \u0627\u0644\u0634\u0639\u0644\u0629ard is essential because similar nominal sizes may use different \u0627\u0644\u062e\u064a\u0637 profiles.<\/p>\n\n<h2 class=\"wp-block-heading\">How \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s Differ from 1\/8 NPT \u0627\u0644\u062e\u064a\u0637s<\/h2>\n\n<p class=\"wp-block-paragraph\">The <strong>11\/32 \u0628\u0648\u0635\u0629 \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631<\/strong> discussed above applies to preparing a \u0627\u0644\u0628\u0626\u0631 for a <strong>1\/8-27 NPT \u0627\u0644\u0635\u0646\u0628\u0648\u0631<\/strong>. \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s use a different design system and should not be selected from an NPT \u0627\u0644\u0635\u0646\u0628\u0648\u0631 \u0627\u0644\u062d\u0641\u0631 chart.<\/p>\n\n<p class=\"wp-block-paragraph\">NPT \u0627\u0644\u062e\u064a\u0637s are commonly used for small piping, fittings, hydraulic ports, and instrumentation \u0627\u0644\u0648\u0635\u0644\u0629s. \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631, by contrast, connects individual \u0627\u0644\u0648\u0635\u0644\u0629s of the \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 and must transfer \u0627\u0644\u062f\u0648\u0627\u0631 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and axial load while allowing \u0633\u0627\u0626\u0644 \u0627\u0644\u062d\u0641\u0631 to pass through the \u0627\u0644\u0633\u0627\u0642. API Specification 5DP covers steel \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 with upset \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body ends and weld-on \u0627\u0644\u0648\u0635\u0644\u0629s, while API Specification 7-2 addresses the \u0627\u0644\u062e\u064a\u0637ing and gauging of \u0627\u0644\u062f\u0648\u0627\u0631 shouldered \u0627\u0644\u0648\u0635\u0644\u0629s used on \u0627\u0644\u062d\u0641\u0631 equipment.<\/p>\n\n<p class=\"wp-block-paragraph\">This difference changes what engineers need to specify. A 1\/8 NPT \u0627\u0644\u062e\u064a\u0637ed \u0627\u0644\u0628\u0626\u0631 is primarily controlled by \u0627\u0644\u0635\u0646\u0628\u0648\u0631 size, pilot-\u0627\u0644\u0628\u0626\u0631 dia\u0645\u062a\u0631, \u0627\u0644\u062e\u064a\u0637 depth, and machining condition. <strong>API \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s<\/strong> are selected as part of the complete \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 and \u0627\u0644\u0648\u0635\u0644\u0629 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 \u0627\u0644\u062e\u064a\u0637<\/th><th>\u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u0648\u0635\u0644\u0629<\/th><\/tr><\/thead><tbody><tr><td>Main Function<\/td><td>Fluid or instrumentation \u0627\u0644\u0648\u0635\u0644\u0629<\/td><td>Connect \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s in the \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631<\/td><\/tr><tr><td>\u0627\u0644\u0648\u0635\u0644\u0629 System<\/td><td>\u0627\u0644\u0635\u0646\u0628\u0648\u0631ered \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628<\/td><td>\u0627\u0644\u062f\u0648\u0627\u0631 shouldered pin-and-box \u0627\u0644\u0648\u0635\u0644\u0629<\/td><\/tr><tr><td>Main Selection Inputs<\/td><td>\u0627\u0644\u0635\u0646\u0628\u0648\u0631 size, \u0627\u0644\u062d\u0641\u0631 size, \u0627\u0644\u062e\u064a\u0637 depth, material<\/td><td>\u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 size, \u0627\u0644\u0648\u0635\u0644\u0629 dimensions, \u0627\u0644\u0648\u0635\u0644\u0629 designation and \u0627\u0644\u062d\u0641\u0631 duty<\/td><\/tr><tr><td>Machining \/ Inspection Focus<\/td><td>Pilot-\u0627\u0644\u0628\u0626\u0631 size, \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping alignment and finished \u0627\u0644\u062e\u064a\u0637<\/td><td>\u0627\u0644\u062e\u064a\u0637 geometry, shoulder condition, \u0627\u0644\u0648\u0635\u0644\u0629 gauging and dimensional coMPatibility<\/td><\/tr><tr><td>Typical Service<\/td><td>Hydraulic, pneumatic and small piping systems<\/td><td>\u0627\u0644\u0646\u0641\u0637 and \u0627\u0644\u063a\u0627\u0632 \u0627\u0644\u062f\u0648\u0627\u0631 \u0627\u0644\u062d\u0641\u0631<\/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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 purchase specification, the \u0627\u0644\u0648\u0635\u0644\u0629 therefore should not be described simply as a \u201c\u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628.\u201d Buyers normally need to identify the \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 size and \u0627\u0644\u062f\u0631\u062c\u0629 together with the required \u0627\u0644\u0648\u0635\u0644\u0629 and \u0627\u0644\u0648\u0635\u0644\u0629 designation. For <strong><a href=\"__PROTECTED_0__\">API 5DP \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631<\/a><\/strong>, these \u0627\u0644\u0648\u0635\u0644\u0629 details form part of the overall \u0627\u0644\u062d\u0641\u0631-\u0627\u0644\u0633\u0627\u0642 coMPatibility rather than a \u0627\u0644\u0634\u0639\u0644\u0629alone \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping 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\">\u0627\u0644\u062d\u0641\u0631 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 Types and \u0627\u0644\u0648\u0635\u0644\u0629 Selection<\/h2>\n\n<p class=\"wp-block-paragraph\">The term <strong>\u0627\u0644\u062d\u0641\u0631 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 types<\/strong> usually refers to the \u0627\u0644\u062f\u0648\u0627\u0631 shouldered \u0627\u0644\u0648\u0635\u0644\u0629s machined into the \u0627\u0644\u0648\u0635\u0644\u0629s at the ends of the \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631. One end provides the pin \u0627\u0644\u0648\u0635\u0644\u0629 and the other the box \u0627\u0644\u0648\u0635\u0644\u0629. During make-up, the \u0627\u0644\u062e\u064a\u0637ed \u0627\u0644\u0648\u0635\u0644\u0629 draws the \u0627\u0644\u0648\u0635\u0644\u0629s together and the shoulders form the controlled contact interface required for \u0627\u0644\u062d\u0641\u0631 service.<\/p>\n\n<p class=\"wp-block-paragraph\">API 7-2 defines dimensional and gauging requirements for \u0627\u0644\u062f\u0648\u0627\u0631 shouldered \u0627\u0644\u0648\u0635\u0644\u0629s. The \u0627\u0644\u0634\u0639\u0644\u0629ard includes NC \u0627\u0644\u0648\u0635\u0644\u0629s and also addresses other established \u0627\u0644\u0648\u0635\u0644\u0629 forms, including IF and FH designations. Some older IF and FH sizes correspond to specified NC \u0627\u0644\u0648\u0635\u0644\u0629s, so the exact designation and dimensions should be checked rather than assuming that all names describe completely separate \u0627\u0644\u062e\u064a\u0637 systems.<\/p>\n\n<p class=\"wp-block-paragraph\">When reviewing a \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629, engineers typically consider:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>coMPatibility with the existing \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 and crossover subs;<\/li>\n\n\n\n<li>\u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0642\u0637\u0631 \u0627\u0644\u062e\u0627\u0631\u062c\u064a and wall section;<\/li>\n\n\n\n<li>\u0627\u0644\u0648\u0635\u0644\u0629 outside and \u0627\u0644\u0642\u0637\u0631 \u0627\u0644\u062f\u0627\u062e\u0644\u064as;<\/li>\n\n\n\n<li>required \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and axial-load performance;<\/li>\n\n\n\n<li>internal flow area for \u0633\u0627\u0626\u0644 \u0627\u0644\u062d\u0641\u0631;<\/li>\n\n\n\n<li>pin, box, \u0627\u0644\u062e\u064a\u0637, 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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s<\/strong> cannot be selected using the same logic as a 1\/8 NPT \u0627\u0644\u0635\u0646\u0628\u0648\u0631. The \u0627\u0644\u062e\u064a\u0637 is only one part of the \u0627\u0644\u0648\u0635\u0644\u0629; \u0627\u0644\u0648\u0635\u0644\u0629 geometry and coMPatibility with the \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0633\u0627\u0642 are equally important.<\/p>\n\n<p class=\"wp-block-paragraph\">For buyers coMParing \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 specifications, <strong>API 5DP \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631<\/strong> provides the natural point for checking \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u062f\u0631\u062c\u0629, dimensions, \u0627\u0644\u0648\u0635\u0644\u0629 configuration, and \u0627\u0644\u0648\u0635\u0644\u0629 requirements together rather than treating the \u0627\u0644\u062e\u064a\u0637 as an isolated machining detail.<\/p>\n\n<p class=\"wp-block-paragraph\">The distinction is important before returning to the o\u062d\u0641\u0627\u0631\u0629 \u0627\u0644\u062d\u0641\u0631inal \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping question: <strong>1\/8 NPT \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 selection applies to a machined NPT port, not to \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u062e\u064a\u0637s.<\/strong> For a 1\/8 NPT \u0627\u0644\u0628\u0626\u0631, \u0627\u0644\u062d\u0641\u0631 dia\u0645\u062a\u0631, \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping alignment, \u0627\u0644\u062e\u064a\u0637 depth, and confirmation of the correct \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-\u0627\u0644\u062e\u064a\u0637 \u0627\u0644\u0634\u0639\u0644\u0629ard 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=\"\u062a\u0636\u0645\u064a\u0646 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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629s 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 \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631s for \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping<\/h2>\n\n<h3 class=\"wp-block-heading\">Using the Wrong \u0627\u0644\u062e\u064a\u0637 \u0627\u0644\u0634\u0639\u0644\u0629ard<\/h3>\n\n<p class=\"wp-block-paragraph\">A 1\/8 NPT \u0627\u0644\u0635\u0646\u0628\u0648\u0631 cannot be directly replaced with BSPT or BSPP tooling because the \u0627\u0644\u062e\u064a\u0637 geometry is different.<\/p>\n\n<h3 class=\"wp-block-heading\">Selecting the Wrong \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 Size<\/h3>\n\n<p class=\"wp-block-paragraph\">Incorrect \u0627\u0644\u062d\u0641\u0631 dimensions may cause:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Poor \u0627\u0644\u062e\u064a\u0637 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 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 Size With Actual Dia\u0645\u062a\u0631<\/h3>\n\n<p class=\"wp-block-paragraph\">The nominal \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 size does not indicate the required \u0627\u0644\u062d\u0641\u0631 dia\u0645\u062a\u0631. Always check the correct \u0627\u0644\u0635\u0646\u0628\u0648\u0631 \u0627\u0644\u062d\u0641\u0631 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\/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\">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 \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 size before using a 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631 is essential for creating accurate internal \u0627\u0644\u062e\u064a\u0637s and achieving reliable sealing performance. For the commonly used 1\/8-27 NPT \u0627\u0644\u0635\u0646\u0628\u0648\u0631, the recommended \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 size is 11\/32 \u0628\u0648\u0635\u0629 (8.73 mm). The correct 1\/8 NPT \u0627\u0644\u0635\u0646\u0628\u0648\u0631 \u0627\u0644\u062d\u0641\u0631 size depends on the \u0627\u0644\u062e\u064a\u0637 \u0627\u0644\u0634\u0639\u0644\u0629ard, material &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/\" class=\"more-link\">Read more<span class=\"screen-reader-text\"> &#8220;What Size \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 for 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631?&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":15643,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[105],"tags":[],"class_list":["post-15640","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>What Size \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 for 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631? Drillpipes -<\/title>\n<meta name=\"description\" content=\"What size \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 for 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631? Use a Letter Q \u0627\u0644\u062d\u0641\u0631 (0.332 in \/ 8.43 mm) for 1\/8-27 NPT, with \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping steps and \u0627\u0644\u062d\u0641\u0631 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 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\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/\" \/>\n<meta property=\"og:locale\" content=\"ar_AR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Size \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 for 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631? Drillpipes -\" \/>\n<meta property=\"og:description\" content=\"What size \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 for 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631? Use a Letter Q \u0627\u0644\u062d\u0641\u0631 (0.332 in \/ 8.43 mm) for 1\/8-27 NPT, with \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping steps and \u0627\u0644\u062d\u0641\u0631 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 differences.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/\" \/>\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=\"2026-09-18T07:59:28+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=\"\u0643\u064f\u062a\u0628 \u0628\u0648\u0627\u0633\u0637\u0629\" \/>\n\t<meta name=\"twitter:data1\" content=\"Lynx Bai\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u0648\u0642\u062a \u0627\u0644\u0642\u0631\u0627\u0621\u0629 \u0627\u0644\u0645\u064f\u0642\u062f\u0651\u0631\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 \u062f\u0642\u0627\u0626\u0642\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/\"},\"author\":{\"name\":\"Lynx Bai\",\"@id\":\"https:\/\/www.drillpipes.com\/ar\/#\/schema\/person\/f813bbf4962cabb7ae7583f03f51bd2e\"},\"headline\":\"What Size \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 for 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631?\",\"datePublished\":\"2026-08-14T10:26:40+00:00\",\"dateModified\":\"2026-09-18T07:59:28+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/\"},\"wordCount\":1322,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.drillpipes.com\/ar\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/08\/what-size-drill-bit-for-1-8-pipe-thread-tap.png\",\"articleSection\":[\"\u0645\u062f\u0648\u0646\u0629\"],\"inLanguage\":\"ar\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/\",\"url\":\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/\",\"name\":\"What Size \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 for 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631? Drillpipes -\",\"isPartOf\":{\"@id\":\"https:\/\/www.drillpipes.com\/ar\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/#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\":\"2026-09-18T07:59:28+00:00\",\"description\":\"What size \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 for 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631? Use a Letter Q \u0627\u0644\u062d\u0641\u0631 (0.332 in \/ 8.43 mm) for 1\/8-27 NPT, with \u0627\u0644\u0635\u0646\u0628\u0648\u0631ping steps and \u0627\u0644\u062d\u0641\u0631 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 differences.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/#breadcrumb\"},\"inLanguage\":\"ar\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"ar\",\"@id\":\"https:\/\/www.drillpipes.com\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/#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\/ar\/what-size-%d9%85%d8%ab%d9%82%d8%a7%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-for-1-8-%d8%ae%d9%8a%d8%b7-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%b5%d9%86%d8%a8%d9%88%d8%b1\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.drillpipes.com\/ar\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What Size \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 for 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.drillpipes.com\/ar\/#website\",\"url\":\"https:\/\/www.drillpipes.com\/ar\/\",\"name\":\"Drillpipes\",\"description\":\"Drill Pipe Supplier for Oil &amp; Gas Drilling | OCTAL\",\"publisher\":{\"@id\":\"https:\/\/www.drillpipes.com\/ar\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.drillpipes.com\/ar\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"ar\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.drillpipes.com\/ar\/#organization\",\"name\":\"Drillpipes\",\"url\":\"https:\/\/www.drillpipes.com\/ar\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ar\",\"@id\":\"https:\/\/www.drillpipes.com\/ar\/#\/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\/ar\/#\/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\/ar\/#\/schema\/person\/f813bbf4962cabb7ae7583f03f51bd2e\",\"name\":\"Lynx Bai\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ar\",\"@id\":\"https:\/\/www.drillpipes.com\/ar\/#\/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 \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 for 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631? Drillpipes -","description":"What size \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 for 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631? 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Drillpipes -","og_description":"What size \u0645\u062b\u0642\u0627\u0628 \u0627\u0644\u062d\u0641\u0631 for 1\/8 \u062e\u064a\u0637 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u0627\u0644\u0635\u0646\u0628\u0648\u0631? 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