{"id":15478,"date":"2026-07-21T03:11:07","date_gmt":"2026-07-21T03:11:07","guid":{"rendered":"https:\/\/npt-lok.com\/?p=15478"},"modified":"2026-08-24T01:27:45","modified_gmt":"2026-08-24T01:27:45","slug":"%d9%85%d9%88%d8%b6%d9%88%d8%b9-%d9%85%d9%82%d8%a7%d8%b1%d9%86%d8%a9-%d8%a8%d9%8a%d9%86-npt-%d9%88-bsp","status":"publish","type":"post","link":"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/","title":{"rendered":"\u0647\u0644 \u064a\u0645\u0643\u0646 \u0627\u0633\u062a\u0628\u062f\u0627\u0644 \u062e\u064a\u0648\u0637 NPT \u0648 BSP\u061f | \u0627\u0644\u0627\u062e\u062a\u0644\u0627\u0641\u0627\u062a \u0648\u0646\u0635\u0627\u0626\u062d \u0644\u0644\u062a\u0645\u064a\u064a\u0632"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">The short answer is NO \u2013 NPT and BSP threads are not interchangeable. NPT has a 60\u00b0 thread angle, while BSP has a 55\u00b0 angle. <a href=\"https:\/\/npt-lok.com\/ar\/%d8%a3%d9%86%d9%88%d8%a7%d8%b9-%d8%aa%d8%ac%d9%87%d9%8a%d8%b2%d8%a7%d8%aa-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8\/\">Threaded fittings<\/a> are essential. Here is exactly why, and how to tell them apart in 3 simple steps.<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-15479\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/07\/NPT-vs.-BSP.png\" alt=\"BSP vs. NPT Threads\" width=\"675\" height=\"400\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/07\/NPT-vs.-BSP.png 675w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/07\/NPT-vs.-BSP-18x12.png 18w\" sizes=\"auto, (max-width: 675px) 100vw, 675px\" \/><\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_88 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u062c\u062f\u0648\u0644 \u0627\u0644\u0645\u062d\u062a\u0648\u064a\u0627\u062a<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\u062a\u0628\u062f\u064a\u0644<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#What_Is_an_NPT_Thread\" >What Is an NPT Thread<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Key_Features\" >Key Features<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Tapered_Design\" >Tapered Design<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#60%C2%B0_Thread_Angle\" >60\u00b0 Thread Angle<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Flat_Peaks_and_Valleys\" >Flat Peaks and Valleys<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Common_Applications\" >Common Applications<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#What_Is_a_BSP_Thread\" >What Is a BSP Thread?<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#BSPT_British_Standard_Pipe_Tapered\" >BSPT (British Standard Pipe Tapered)<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Design\" >Design<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Sealing_Method\" >\u0637\u0631\u064a\u0642\u0629 \u0627\u0644\u062e\u062a\u0645<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Identification\" >Identification<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#BSPP_British_Standard_Pipe_Parallel\" >BSPP (British Standard Pipe Parallel)<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Design-2\" >Design<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Sealing_Method-2\" >\u0637\u0631\u064a\u0642\u0629 \u0627\u0644\u062e\u062a\u0645<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Identification-2\" >Identification:\u00a0<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Detailed_Comparison_NPT_vs_BSP\" >Detailed Comparison: NPT vs. BSP<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#How_to_Identify_and_Distinguish_NPT_and_BSP_Threads\" >How to Identify and Distinguish NPT and BSP Threads<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Step_1_Check_for_Thread_Tapered_or_Parallel\" >Step 1: Check for Thread Tapered or Parallel<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Step_2_Measure_the_Threads_Per_Inch\" >Step 2: Measure the Threads Per Inch<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#Step_3_Inspect_the_Thread_Angle_and_Profile_Shape\" >Step 3: Inspect the Thread Angle and Profile Shape<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#FAQs\" >FAQs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/npt-lok.com\/ar\/npt-vs-bsp-thread\/#NPT_and_BSP_Thread_Solutions_from_NPTLOK\" >NPT and BSP Thread Solutions from NPTLOK<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"What_Is_an_NPT_Thread\"><\/span><span style=\"font-weight: 400;\">What Is an NPT Thread<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/npt-lok.com\/ar\/%d8%aa%d8%ac%d9%87%d9%8a%d8%b2%d8%a7%d8%aa-%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%a3%d8%ac%d9%87%d8%b2%d8%a9\/%d8%aa%d8%ac%d9%87%d9%8a%d8%b2%d8%a7%d8%aa-npt\/\"><span style=\"font-weight: 400;\">\u0645\u0639\u0627\u0647\u062f\u0629 \u062d\u0638\u0631 \u0627\u0644\u0627\u0646\u062a\u0634\u0627\u0631 \u0627\u0644\u0646\u0648\u0648\u064a<\/span><\/a><span style=\"font-weight: 400;\"> (National Pipe Tapered) follows ASME B1.20.1, which is the default standard across North American pipe systems.<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"Key_Features\"><\/span><span style=\"font-weight: 400;\">Key Features<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<h5><span class=\"ez-toc-section\" id=\"Tapered_Design\"><\/span><span style=\"font-weight: 400;\">Tapered Design<\/span><span class=\"ez-toc-section-end\"><\/span><\/h5>\n<p><span style=\"font-weight: 400;\">All NPT threads feature a tapered profile. The taper rate is 1 inch in 16 inches (3\/4 inch per foot), measured on the diameter. The angle between the taper and the center axis of the pipe is 1\u00b047\u201824\u2019\u2018 (1.7899\u00b0). This taper creates a wedging effect when the male and female threads are tightened together, producing a mechanical seal through metal-to-metal interference.<\/span><\/p>\n<h5><span class=\"ez-toc-section\" id=\"60%C2%B0_Thread_Angle\"><\/span><span style=\"font-weight: 400;\">60\u00b0 Thread Angle<\/span><span class=\"ez-toc-section-end\"><\/span><\/h5>\n<p><span style=\"font-weight: 400;\">NPT threads have a 60\u00b0 thread angle, measured between the sides of the thread.<\/span><\/p>\n<h5><span class=\"ez-toc-section\" id=\"Flat_Peaks_and_Valleys\"><\/span><span style=\"font-weight: 400;\">Flat Peaks and Valleys<\/span><span class=\"ez-toc-section-end\"><\/span><\/h5>\n<p><span style=\"font-weight: 400;\">NPT threads feature flat peaks and valleys, known as the Sellers thread form as well. Because of the slight clearance between the roots and crests, a spiral leak path exists along the thread. This is why thread sealant or PTFE tape is required to achieve a leak-free seal.<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"Common_Applications\"><\/span><span style=\"font-weight: 400;\">Common Applications<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Water supply systems<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Natural gas pipelines<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u0627\u0644\u0623\u0646\u0638\u0645\u0629 \u0627\u0644\u0647\u064a\u062f\u0631\u0648\u0644\u064a\u0643\u064a\u0629<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pneumatic systems<\/span><\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"What_Is_a_BSP_Thread\"><\/span><span style=\"font-weight: 400;\">What Is a BSP Thread?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">BSP(<\/span><span style=\"font-weight: 400;\">British Standard Pipe<\/span><span style=\"font-weight: 400;\">) threads are widely used in Europe, Asia, Australia, and many other regions outside North America. BSP is governed by ISO 7-1 and ISO 228-1, and is divided into two distinct sub-types: BSPT and BSPP.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-15480\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/07\/BSPT-vs.-BSPP-thread.png\" alt=\"BSPT and BSPP thread fittings\" width=\"535\" height=\"285\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/07\/BSPT-vs.-BSPP-thread.png 535w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/07\/BSPT-vs.-BSPP-thread-18x10.png 18w\" sizes=\"auto, (max-width: 535px) 100vw, 535px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">BSP is the area where we encounter the most confusion. We\u2019ve had instances where a customer placed an order for \u201cBSPP threads,\u201d but the factory mistakenly interpreted this as the Chinese ZG thread (where ZG refers to BSPT\/R, a tapered thread), while the customer actually needed G (parallel) threads\u2014that is, the ISO 228 standard. Besides, some customers believe that BSPP corresponds to ISO parallel threads (RS) and BSPT corresponds to ISO tapered pipe threads (RT). Interpretations vary among different customers and manufacturers.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Therefore, when you purchase BSP threads, be sure to confirm whether you need tapered threads (R \/ Rc \/ Rp) or parallel threads (G). This simple confirmation can save you weeks of rework.<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"BSPT_British_Standard_Pipe_Tapered\"><\/span><span style=\"font-weight: 400;\">BSPT (British Standard Pipe Tapered)<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<h5><span class=\"ez-toc-section\" id=\"Design\"><\/span><span style=\"font-weight: 400;\">Design<\/span><span class=\"ez-toc-section-end\"><\/span><\/h5>\n<p><span style=\"font-weight: 400;\">BSPT threads are tapered at the same 1:16 ratio as NPT threads (1\u00b047\u2018), but they follow the Whitworth thread form. BSPT is governed by ISO 7-1 (formerly BS 21) and is designed for pressure-tight joints made on the threads themselves.<\/span><\/p>\n<h5><span class=\"ez-toc-section\" id=\"Sealing_Method\"><\/span><span style=\"font-weight: 400;\">\u0637\u0631\u064a\u0642\u0629 \u0627\u0644\u062e\u062a\u0645<\/span><span class=\"ez-toc-section-end\"><\/span><\/h5>\n<p><span style=\"font-weight: 400;\">BSPT threads seal through the wedging action of the tapered threads, with contact made on the flanks. Thread sealant or PTFE tape is recommended to ensure a pressure-tight seal by filling the voids between threads.<\/span><\/p>\n<h5><span class=\"ez-toc-section\" id=\"Identification\"><\/span><span style=\"font-weight: 400;\">Identification<\/span><span class=\"ez-toc-section-end\"><\/span><\/h5>\n<p><span style=\"font-weight: 400;\">External tapered threads are designated by the letter <\/span><b>R<\/b><span style=\"font-weight: 400;\">, while internal parallel or tapered threads are designated by <\/span><b>Rp<\/b><span style=\"font-weight: 400;\"> \u0623\u0648 <\/span><b>Rc<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Supplementary Explanation:<\/span><\/p>\n<p><b>R<\/b><span style=\"font-weight: 400;\"> = male BSPT<\/span><\/p>\n<p><b>Rc<\/b><span style=\"font-weight: 400;\"> = female BSPT<\/span><\/p>\n<p><b>Rp<\/b><span style=\"font-weight: 400;\"> = female BSP parallel-compatible thread<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"BSPP_British_Standard_Pipe_Parallel\"><\/span><span style=\"font-weight: 400;\">BSPP (British Standard Pipe Parallel)<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<h5><span class=\"ez-toc-section\" id=\"Design-2\"><\/span><span style=\"font-weight: 400;\">Design<\/span><span class=\"ez-toc-section-end\"><\/span><\/h5>\n<p><span style=\"font-weight: 400;\">BSPP threads are parallel (straight)\u2014the diameter remains constant from end to end. BSPP is governed by ISO 228-1 (formerly BS 2779) and is designed for joints where pressure-tight seals are not made on the threads themselves.<\/span><\/p>\n<h5><span class=\"ez-toc-section\" id=\"Sealing_Method-2\"><\/span><span style=\"font-weight: 400;\">\u0637\u0631\u064a\u0642\u0629 \u0627\u0644\u062e\u062a\u0645<\/span><span class=\"ez-toc-section-end\"><\/span><\/h5>\n<p><span style=\"font-weight: 400;\">Because BSPP threads are parallel and do not create a wedging seal, they require an additional sealing element. Common sealing methods include:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Bonded washers (Dowty seals)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">O-rings<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Copper crush washers<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The seal is typically made at the face of the fitting rather than through the threads. This makes BSPP connections easier to reuse than tapered thread connections.<\/span><\/p>\n<h5><span class=\"ez-toc-section\" id=\"Identification-2\"><\/span><span style=\"font-weight: 400;\">Identification:\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h5>\n<p><span style=\"font-weight: 400;\">BSPP threads are often designated with the letter G (e.g., G 1\/4, G 1\/2).<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Detailed_Comparison_NPT_vs_BSP\"><\/span><span style=\"font-weight: 400;\">Detailed Comparison: NPT vs. BSP<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">\u0645\u064a\u0632\u0629<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0645\u0639\u0627\u0647\u062f\u0629 \u062d\u0638\u0631 \u0627\u0644\u0627\u0646\u062a\u0634\u0627\u0631 \u0627\u0644\u0646\u0648\u0648\u064a<\/span><\/td>\n<td><span style=\"font-weight: 400;\">BSPT<\/span><\/td>\n<td><span style=\"font-weight: 400;\">BSPP<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Standed<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASME B1.20.1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ISO 7-1 (BS 21)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ISO 228-1 (BS 2779)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Thread Form<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Sellers<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Whitworth<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Whitworth<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Thread Angle<\/span><\/td>\n<td><span style=\"font-weight: 400;\">60\u00b0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">55\u00b0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">55\u00b0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Profile<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Tapered (1:16)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Tapered (1:16)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Parallel (straight)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Peaks &amp; Valleys<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Flat<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Rounded<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Rounded<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u0637\u0631\u064a\u0642\u0629 \u0627\u0644\u062e\u062a\u0645<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Thread wedging + sealant<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Thread wedging + sealant<\/span><\/td>\n<td><span style=\"font-weight: 400;\">O-ring, bonded washer, or crush washer<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Primary Region<\/span><\/td>\n<td><span style=\"font-weight: 400;\">North American<\/span><\/td>\n<td><span style=\"font-weight: 400;\">UK, Europe, Asia, Australia, Africa<\/span><\/td>\n<td><span style=\"font-weight: 400;\">UK, Europe, Asia, Australia, Africa<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Designation<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0645\u0639\u0627\u0647\u062f\u0629 \u062d\u0638\u0631 \u0627\u0644\u0627\u0646\u062a\u0634\u0627\u0631 \u0627\u0644\u0646\u0648\u0648\u064a<\/span><\/td>\n<td><span style=\"font-weight: 400;\">R \/ Rp \/ Rc<\/span><\/td>\n<td><span style=\"font-weight: 400;\">G<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">NPT and BSP are different pipe thread standards.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The main differences are:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">NPT: 60\u00b0 thread angle, flat crest\/root, mainly North America<\/span><\/p>\n<p><span style=\"font-weight: 400;\">BSP: 55\u00b0 thread angle, rounded crest\/root, widely used internationally<\/span><\/p>\n<p><span style=\"font-weight: 400;\">NPT and BSP cannot be directly connected without an adapter<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_Identify_and_Distinguish_NPT_and_BSP_Threads\"><\/span><span style=\"font-weight: 400;\">How to Identify and Distinguish NPT and BSP Threads<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h5><span class=\"ez-toc-section\" id=\"Step_1_Check_for_Thread_Tapered_or_Parallel\"><\/span><span style=\"font-weight: 400;\">Step 1: Check for Thread Tapered or Parallel<\/span><span class=\"ez-toc-section-end\"><\/span><\/h5>\n<p><span style=\"font-weight: 400;\">Tapered threads indicate either NPT (60\u00b0) or BSPT (55\u00b0).\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Parallel threads indicate BSPP (55\u00b0).<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-15481\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/07\/NPT-vs.BSP\uff08angle\uff09\uff09.png\" alt=\"NPT vs. BSP\uff08angle\uff09\" width=\"399\" height=\"376\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/07\/NPT-vs.BSP\uff08angle\uff09\uff09.png 399w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/07\/NPT-vs.BSP\uff08angle\uff09\uff09-13x12.png 13w\" sizes=\"auto, (max-width: 399px) 100vw, 399px\" \/><\/p>\n<h5><span class=\"ez-toc-section\" id=\"Step_2_Measure_the_Threads_Per_Inch\"><\/span><span style=\"font-weight: 400;\">Step 2: Measure the Threads Per Inch<\/span><span class=\"ez-toc-section-end\"><\/span><\/h5>\n<p><span style=\"font-weight: 400;\">Use a thread pitch gauge to measure the number of threads per inch. Compare your measurement against standard values:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Pipe Size<\/span><\/td>\n<td><span style=\"font-weight: 400;\">NPT (TPI)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">BSP (TPI)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1\/8\u201d<\/span><\/td>\n<td><span style=\"font-weight: 400;\">27<\/span><\/td>\n<td><span style=\"font-weight: 400;\">28<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1\/4\u201d<\/span><\/td>\n<td><span style=\"font-weight: 400;\">18<\/span><\/td>\n<td><span style=\"font-weight: 400;\">19<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">3\/8\u201d<\/span><\/td>\n<td><span style=\"font-weight: 400;\">18<\/span><\/td>\n<td><span style=\"font-weight: 400;\">19<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1\/2\u201d<\/span><\/td>\n<td><span style=\"font-weight: 400;\">14<\/span><\/td>\n<td><span style=\"font-weight: 400;\">14<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">3\/4\u201d<\/span><\/td>\n<td><span style=\"font-weight: 400;\">14<\/span><\/td>\n<td><span style=\"font-weight: 400;\">14<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1\u201d<\/span><\/td>\n<td><span style=\"font-weight: 400;\">11.5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">11<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5><span class=\"ez-toc-section\" id=\"Step_3_Inspect_the_Thread_Angle_and_Profile_Shape\"><\/span><span style=\"font-weight: 400;\">Step 3: Inspect the Thread Angle and Profile Shape<\/span><span class=\"ez-toc-section-end\"><\/span><\/h5>\n<p><span style=\"font-weight: 400;\">Examine the shape of the thread peaks and valleys:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">NPT threads have a 60\u00b0 angle with flat peaks and valleys (Sellers thread form)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">BSP threads have a 55\u00b0 angle with rounded peaks and valleys (Whitworth thread form)<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">This difference can often be observed with a magnifying glass or by using a thread profile gauge. The 5-degree difference in angle and the rounded vs. flat profile are definitive identifiers.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"FAQs\"><\/span><span style=\"font-weight: 400;\">FAQs<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Q1. Can I connect an NPT male fitting to a BSPT female port?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">No. NPT uses a 60\u00b0 thread angle, while BSP uses 55\u00b0. They may start to thread together, but they will not seal. Use a proper <\/span><a href=\"https:\/\/npt-lok.com\/ar\/%d8%aa%d8%ac%d9%87%d9%8a%d8%b2%d8%a7%d8%aa-%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%a3%d8%ac%d9%87%d8%b2%d8%a9\/bspp-to-npt-adapter\/\"><span style=\"font-weight: 400;\">adapter<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Q2. When should I choose NPT over BSP?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You could determine it depends on two factors. One is the region, and the other is the maintenance frequency. North America uses NPT, while most other regions use BSP.For frequent disassembly, choose BSPP (O\u2011ring face seal). For permanent or infrequent joints, NPT or BSPT works fine. Always match your existing system.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Q3. Does BSPP thread need Teflon tape or sealant?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">No. BSPP seals via an O\u2011ring or washer at the face \u2013 not through the threads. Applying tape increases friction, prevents the O\u2011ring from seating properly, and may introduce debris into the line. Only tapered threads (NPT\/BSPT) require thread sealant.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"NPT_and_BSP_Thread_Solutions_from_NPTLOK\"><\/span><span style=\"font-weight: 400;\">NPT and BSP Thread Solutions from NPTLOK<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">NPTLOK manufactures precision tube fittings and valves with NPT, BSPT, and BSPP thread options to meet different international installation requirements.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Our products are available in stainless steel 316\/304, carbon steel, brass, and aluminum.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Thread types available:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">NPT (ASME B1.20.1)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">BSPT (ISO 7-1, RT) \u2014 tapered<\/span><\/p>\n<p><span style=\"font-weight: 400;\">BSPP (ISO 228, RS\/RP) \u2014 parallel<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Whether you need a specific thread standard, size, or material, our team can provide suitable fitting solutions.<\/span><\/p>\n<p>\u064a\u062a\u0639\u0644\u0645 \u0623\u0643\u062b\u0631 <a href=\"https:\/\/npt-lok.com\/ar\/%d9%85%d8%b9%d9%84%d9%88%d9%85%d8%a7%d8%aa-%d8%b9%d9%86%d8%a7\/\">\u0645\u0639\u0644\u0648\u0645\u0627\u062a \u0639\u0646\u0627<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>The short answer is NO \u2013 NPT and BSP threads are not interchangeable. NPT has a 60\u00b0 thread angle, while BSP has a 55\u00b0 angle. Threaded fittings are essential. Here is exactly why, and how to tell them apart in 3 simple steps. What Is an NPT Thread NPT (National Pipe Tapered) follows ASME B1.20.1, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-15478","post","type-post","status-publish","format-standard","hentry","category-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Can NPT and BSP Threads Be Interchanged? | Differences &amp; Identification Tips<\/title>\n<meta name=\"description\" content=\"NPT uses a 60\u00b0 tapered thread, while BSP has 55\u00b0 parallel or tapered threads \u2013 they are not directly compatible. 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