{"id":15795,"date":"2026-10-08T09:27:25","date_gmt":"2026-10-08T09:27:25","guid":{"rendered":"https:\/\/npt-lok.com\/?p=15795"},"modified":"2026-10-08T09:41:02","modified_gmt":"2026-10-08T09:41:02","slug":"what-is-a-pipe-nipple","status":"publish","type":"post","link":"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/","title":{"rendered":"What Is a Pipe Nipple?"},"content":{"rendered":"<p style=\"font-size: 16px; font-style: normal; font-weight: 400;\"><span style=\"font-weight: 400;\">What is a nipple in piping? A <\/span><a style=\"font-size: 16px; background-color: #ffffff;\" 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%ad%d9%84%d9%85%d8%a9-%d8%a3%d9%86%d8%a8%d9%88%d8%a8\/\"><span style=\"font-weight: 400;\">\u062d\u0644\u0645\u0629 \u0623\u0646\u0628\u0648\u0628<\/span><\/a><span style=\"font-weight: 400;\"> is basically a short hollow fitting, normally male-threaded at both ends. In instrument setups, it connects the female-threaded ports on valves, manifolds, instruments, and other fittings.<img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15796 aligncenter\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/01-hex-pipe-nipple.jpg\" alt=\"A hex pipe nipple with male threads at both ends and a central wrenching hex\" width=\"253\" height=\"253\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/01-hex-pipe-nipple.jpg 750w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/01-hex-pipe-nipple-150x150.jpg 150w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/01-hex-pipe-nipple-12x12.jpg 12w\" sizes=\"auto, (max-width: 253px) 100vw, 253px\" \/><\/span><\/p>\n<p><span style=\"font-size: 27.2px; font-weight: 400;\">What Is a Pipe Nipple Used For?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A valve with a female threaded port and an elbow with another female threaded port cannot screw directly into each other. A nipple provides the male connection at each end and a passage for the fluid between them.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It can also provide clearance between components. A longer nipple may make room for a valve handle, insulation or a wrench. A close nipple brings the components nearer together when space is limited.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In instrumentation assemblies, choosing the right length is therefore part of planning access for installation and maintenance, as well as making the connection.<\/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-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Common_Types_of_Pipe_Nipples\" >Common Types of Pipe Nipples<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#What_Is_an_NPT_Nipple\" >What Is an NPT Nipple?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Pipe_Nipple_Materials\" >Pipe Nipple Materials<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Black_steel_black_pipe_nipple\" >Black steel \/ black pipe nipple<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Stainless_steel_nipple\" >Stainless steel nipple<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Brass_nipple\" >Brass nipple<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#How_to_Read_Pipe_Nipple_Sizes\" >How to Read Pipe Nipple Sizes<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Connection_Size\" >Connection Size<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Overall_Length\" >Overall Length<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Bore\" >Bore<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Pipe_Nipple_Installation_Notes\" >Pipe Nipple Installation Notes<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Clean_Threads\" >Clean Threads<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Thread_Seal_Tape\" >Thread Seal Tape<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Tightening_Torque\" >Tightening Torque<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Avoid_Overtightening\" >Avoid Overtightening<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#FAQ\" >\u0627\u0644\u062a\u0639\u0644\u064a\u0645\u0627\u062a<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/#Contact_Us\" >\u0627\u062a\u0635\u0644 \u0628\u0646\u0627<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Common_Types_of_Pipe_Nipples\"><\/span><a href=\"https:\/\/npt-lok.com\/ar\/%d8%a3%d9%86%d9%88%d8%a7%d8%b9-%d8%ad%d9%84%d9%85%d8%a7%d8%aa-%d8%b3%d8%af%d8%a7%d8%b3%d9%8a%d8%a9\/\"><span style=\"font-weight: 400;\">Common Types of Pipe Nipples<\/span><\/a><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The names below describe different features. For example, a nipple can be both stainless steel and hexagonal, those are not competing classifications.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">\u064a\u0643\u062a\u0628<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Identifying feature<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Main purpose<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Barrel nipple<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Cylindrical body with threads at both ends<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Connects components with a specified separation<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Close nipple<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Little or no unthreaded space between the end threads<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Makes a compact connection<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Shoulder nipple<\/span><\/td>\n<td><span style=\"font-weight: 400;\">A short unthreaded section<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Provides slightly more separation than a close nipple<\/span><\/td>\n<\/tr>\n<tr>\n<td><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%ad%d9%84%d9%85%d8%a9-%d8%b3%d8%af%d8%a7%d8%b3%d9%8a%d8%a9\/\"><span style=\"font-weight: 400;\">Hex nipple<\/span><\/a><\/td>\n<td><span style=\"font-weight: 400;\">Hexagonal wrench flats between the ends<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Provides a defined gripping surface<\/span><\/td>\n<\/tr>\n<tr>\n<td><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%ad%d9%84%d9%85%d8%a9-%d8%b3%d8%af%d8%a7%d8%b3%d9%8a%d8%a9-%d8%b7%d9%88%d9%8a%d9%84%d8%a9\/\"><span style=\"font-weight: 400;\">Long hex nipple<\/span><\/a><\/td>\n<td><span style=\"font-weight: 400;\">Extended body with wrench flats<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Adds clearance while retaining wrench access<\/span><\/td>\n<\/tr>\n<tr>\n<td><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%b5%d8%ba%d9%8a%d8%b1-%d8%a7%d9%84%d8%ad%d9%84%d9%85%d8%a9\/\"><span style=\"font-weight: 400;\">\u062a\u0635\u063a\u064a\u0631 \u0627\u0644\u062d\u0644\u0645\u0629<\/span><\/a><\/td>\n<td><span style=\"font-weight: 400;\">Different connection sizes at the ends<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Joins unequal female port sizes<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15797 alignnone\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/02-long-hex-nipple.jpg\" alt=\"A long hex nipple with an extended body between the threaded ends.\" width=\"247\" height=\"247\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/02-long-hex-nipple.jpg 750w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/02-long-hex-nipple-150x150.jpg 150w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/02-long-hex-nipple-12x12.jpg 12w\" sizes=\"auto, (max-width: 247px) 100vw, 247px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15798 alignnone\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/03-reducing-hex-nipple.jpg\" alt=\"A reducing hex nipple has different connection sizes at its two ends.\" width=\"257\" height=\"257\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/03-reducing-hex-nipple.jpg 540w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/03-reducing-hex-nipple-150x150.jpg 150w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/03-reducing-hex-nipple-12x12.jpg 12w\" sizes=\"auto, (max-width: 257px) 100vw, 257px\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_an_NPT_Nipple\"><\/span><span style=\"font-weight: 400;\">What Is an NPT Nipple?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">An NPT nipple has National Pipe Taper threads on its threaded ends. A male NPT-to-male NPT nipple connects two matching female NPT ports.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">NPT refers to the thread system. A hex nipple and a barrel nipple can both have NPT threads.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Don\u2019t assume two fittings will work together just because their nominal sizes match. <\/span><a href=\"https:\/\/npt-lok.com\/ar\/%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\/\"><span style=\"font-weight: 400;\">NPT and BSP threads<\/span><\/a><span style=\"font-weight: 400;\"> have different profiles, and a connection that starts to screw together isn\u2019t proof that it\u2019s compatible. If you need to transition between thread types, use a fitting with the correct connection at each end.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Pipe_Nipple_Materials\"><\/span><span style=\"font-weight: 400;\">Pipe Nipple Materials<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-12487 aligncenter\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2023\/05\/Female-needle-valve-materials.jpg\" alt=\" materials\" width=\"665\" height=\"420\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Black_steel_black_pipe_nipple\"><\/span><span style=\"font-weight: 400;\">Black steel \/ black pipe nipple<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Black pipe nipples are generally carbon steel nipples supplied without a zinc coating. They are used in piping systems that specify carbon steel, including suitable fuel-gas and industrial services.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Generally speaking, it is best to galvanize the surface of a carbon steel pipe nipple, as this provides greater corrosion resistance and higher hardness. These are also called <\/span><a href=\"https:\/\/npt-lok.com\/ar\/galvanized-pipe-nipples\/\"><span style=\"font-weight: 400;\">galvanized pipe nipples<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Stainless_steel_nipple\"><\/span><a href=\"https:\/\/npt-lok.com\/ar\/%d8%ad%d9%84%d9%85%d8%a7%d8%aa-%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d9%85%d9%86-%d8%a7%d9%84%d9%81%d9%88%d9%84%d8%a7%d8%b0-%d8%a7%d9%84%d9%85%d9%82%d8%a7%d9%88%d9%85-%d9%84%d9%84%d8%b5%d8%af%d8%a3\/\"><span style=\"font-weight: 400;\">Stainless steel nipple<\/span><\/a><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Common stainless steel grades include 304, 316, and 316L. Compared with 304, the molybdenum in 316 and 316L generally improves resistance to chloride-related pitting and crevice corrosion.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Brass_nipple\"><\/span><span style=\"font-weight: 400;\">Brass nipple<\/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%ad%d9%84%d9%85%d8%a9-%d8%b3%d8%af%d8%a7%d8%b3%d9%8a%d8%a9-%d9%85%d9%86-%d8%a7%d9%84%d9%86%d8%ad%d8%a7%d8%b3\/\"><span style=\"font-weight: 400;\">Brass pipe nipples<\/span><\/a><span style=\"font-weight: 400;\"> should preferably have a chrome-plated surface to protect the brass from oxidation and corrosion.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Regarding pipe fitting materials, brass costs less than carbon steel, and carbon steel costs less than stainless steel. Please choose according to your different requirements for corrosion resistance, strength, and <\/span><a href=\"https:\/\/npt-lok.com\/ar\/hex-nipple-prices\/\"><span style=\"font-weight: 400;\">price<\/span><\/a><span style=\"font-weight: 400;\">. Generally speaking, for corrosive media or high pressure, choose 316 stainless steel. For clean water, air, or low pressure, choose brass. For oil, gas, or dry service, choose carbon steel.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Read_Pipe_Nipple_Sizes\"><\/span><a href=\"https:\/\/npt-lok.com\/ar\/%d8%a3%d8%a8%d8%b9%d8%a7%d8%af-%d9%88%d8%a3%d8%ad%d8%ac%d8%a7%d9%85-%d8%ad%d9%84%d9%85%d8%a7%d8%aa-%d8%b3%d8%af%d8%a7%d8%b3%d9%8a%d8%a9\/\"><span style=\"font-weight: 400;\">How to Read Pipe Nipple Sizes<\/span><\/a><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Connection_Size\"><\/span><span style=\"font-weight: 400;\">Connection Size<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The connection has to match the threaded port it screws into\u2014whether that\u2019s on a valve, manifold, or instrument. When you see 1\/4-inch NPT, that\u2019s the nominal thread size. It doesn\u2019t tell you the bore is 1\/4 inch, and it doesn\u2019t mean the nipple takes 1\/4-inch tubing. If the two ends are different, write both out. For example: 1\/2-inch male NPT \u00d7 1\/4-inch male NPT.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Overall_Length\"><\/span><span style=\"font-weight: 400;\">Overall Length<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Overall length is measured across both threaded ends. Remember that some of that length goes inside the mating ports once assembled. If you\u2019re putting a gauge on an isolation valve, leave enough room for the gauge body\u2014and enough room to actually get a wrench in there.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Bore\"><\/span><span style=\"font-weight: 400;\">Bore<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Bore is the inside passage for flow. You\u2019ll find it on the fitting drawing. Two nipples can share the same thread size but have different bores, especially when one is a standard design and the other is high-pressure. Read the bore from the catalog. Don\u2019t calculate it from the nominal connection size.<img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15800 aligncenter\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/05-dimensions-reference-only.png\" alt=\"\" width=\"392\" height=\"382\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/05-dimensions-reference-only.png 191w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/05-dimensions-reference-only-12x12.png 12w\" sizes=\"auto, (max-width: 392px) 100vw, 392px\" \/><\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Pipe_Nipple_Installation_Notes\"><\/span><span style=\"font-weight: 400;\">Pipe Nipple Installation Notes<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">With NPT nipples, look at the port threads first and figure out where the instrument needs to end up before you start assembling.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Clean_Threads\"><\/span><span style=\"font-weight: 400;\">Clean Threads<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Check the nipple and the mating port for burrs, damaged threads, and old sealant. Don\u2019t let debris get into the instrument connection. Start threading by hand. If it binds on the first turn, something\u2019s off\u2014misalignment or mismatched threads.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Thread_Seal_Tape\"><\/span><span style=\"font-weight: 400;\">Thread Seal Tape<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Put a sealant on the male threads that\u2019s approved for the process fluid and temperature. Keep the first few threads clear. Loose tape or too much compound can find its way into small instrument passages. Follow the sealant maker\u2019s instructions for application and curing.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tightening_Torque\"><\/span><span style=\"font-weight: 400;\">Tightening Torque<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Use the tightening procedure specified for the fitting and the equipment it\u2019s mating with. NPT torque changes with size, material, and sealant. Put the wrench on the designated flats, and hold the mating connection with a second wrench. Never use the gauge or transmitter housing as a lever.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Avoid_Overtightening\"><\/span><span style=\"font-weight: 400;\">Avoid Overtightening<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Don\u2019t force an extra turn just to get a gauge face pointing the right way. Over-tightening can damage the instrument port, and backing off can disturb the seal. If the orientation is wrong, remake the connection or use one designed for adjustment. Only make adjustments after isolation and depressurization\u2014then leak-test before putting it into service.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span><span style=\"font-weight: 400;\">\u0627\u0644\u062a\u0639\u0644\u064a\u0645\u0627\u062a<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Q1. What is the difference between a pipe nipple and a coupling?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A typical threaded nipple has male threads on both outside ends. A typical threaded coupling has female threads inside. They connect different combinations of mating parts.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Q2. Does every pipe nipple have threads at both ends?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">No. Threaded both ends, or TBE, is common. Threaded one end, or TOE, also exists, along with weld-end and other styles. Check the drawing for the actual end prep. TOE alone doesn&#8217;t tell you what the other end looks like.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Q3. What Does \u201c2 Inch Black Pipe Nipple\u201d Mean?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It usually means a black carbon steel nipple with 2-inch nominal pipe size.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Q4. Is a 2-inch pipe nipple always 2 inches long?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">No. \u201c2 inch\u201d often means nominal connection size, not actual length. Overall length is a separate spec and must be listed. If only one dimension appears, ask which measurement it is.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Q5. Are black pipe nipples and galvanized nipples the same?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">No. Both can be carbon steel, but galvanized nipples have a zinc coating and black nipples don\u2019t. Coating compatibility and corrosion behavior differ. Same thread size doesn\u2019t mean they can be swapped in every service.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Contact_Us\"><\/span><a href=\"https:\/\/npt-lok.com\/ar\/%d8%a7%d8%aa%d8%b5%d9%84-%d9%84%d9%84%d8%ad%d8%b5%d9%88%d9%84-%d8%b9%d9%84%d9%89-%d8%b9%d8%b1%d8%b6-%d8%a3%d8%b3%d8%b9%d8%a7%d8%b1\/\"><span style=\"font-weight: 400;\">\u0627\u062a\u0635\u0644 \u0628\u0646\u0627<\/span><\/a><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/npt-lok.com\/ar\/%d9%85%d8%b5%d9%86%d9%91%d8%b9-%d8%b9%d8%a7%d9%84%d9%85%d9%8a-%d9%84%d9%88%d8%b5%d9%84%d8%a7%d8%aa-%d8%a7%d9%84%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-2026\/\"><span style=\"font-weight: 400;\">\u0646\u0628\u062a\u0644\u0648\u0643<\/span><\/a><span style=\"font-weight: 400;\">\u2019s pipe nipple includes hex nipples, long hex nipples, close nipples and special pipe nipples, with dimensions and material-dependent ratings for the listed configurations.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Materials we commonly use include stainless steel, carbon steel, brass, and other special materials including <\/span><a href=\"https:\/\/npt-lok.com\/ar\/monel-tube-fittings\/\"><span style=\"font-weight: 400;\">\u0645\u0648\u0646\u064a\u0644<\/span><\/a><span style=\"font-weight: 400;\">, Alloy, <\/span><a href=\"https:\/\/npt-lok.com\/ar\/super-duplex-tube-fittings\/\"><span style=\"font-weight: 400;\">Super Duplex<\/span><\/a><span style=\"font-weight: 400;\">, and so on.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you require carbon steel material, we will do galvanizing on the surface of pipe nipples. If you require brass pipe nipple, we will make the chrome-plated treatment on the surface of brass pipe nipples.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u064a\u062a\u0639\u0644\u0645 \u0623\u0643\u062b\u0631 <\/span><a href=\"https:\/\/npt-lok.com\/ar\/%d8%aa%d8%b9%d8%b1%d9%81-%d8%b9%d9%84%d9%89-%d8%a7%d9%84%d9%85%d8%b2%d9%8a%d8%af-%d8%b9%d9%86%d8%a7\/\"><span style=\"font-weight: 400;\">\u0645\u0639\u0644\u0648\u0645\u0627\u062a \u0639\u0646\u0627<\/span><\/a><span style=\"font-weight: 400;\"> or download our <\/span><a href=\"https:\/\/npt-lok.com\/ar\/%d8%aa%d9%86%d8%b2%d9%8a%d9%84-%d9%83%d8%aa%d8%a7%d9%84%d9%88%d8%ac-%d8%a7%d9%84%d9%85%d9%86%d8%aa%d8%ac\/\"><span style=\"font-weight: 400;\">\u0643\u062a\u0627\u0644\u0648\u062c<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Send us your connection sizes, thread standards, required length and operating conditions. We can help identify a suitable catalog configuration for your assembly.<\/span><\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>What is a nipple in piping? A pipe nipple is basically a short hollow fitting, normally male-threaded at both ends. In instrument setups, it connects the female-threaded ports on valves, manifolds, instruments, and other fittings. What Is a Pipe Nipple Used For? A valve with a female threaded port and an elbow with another female [&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-15795","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>What Is a Pipe Nipple? - NPTLOK Instrumentation Tube Fittings and Valves<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/npt-lok.com\/ar\/what-is-a-pipe-nipple\/\" \/>\n<meta property=\"og:locale\" content=\"ar_AR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is a Pipe Nipple? - NPTLOK Instrumentation Tube Fittings and Valves\" \/>\n<meta property=\"og:description\" content=\"What is a nipple in piping? A pipe nipple is basically a short hollow fitting, normally male-threaded at both ends. In instrument setups, it connects the female-threaded ports on valves, manifolds, instruments, and other fittings. What Is a Pipe Nipple Used For? 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A pipe nipple is basically a short hollow fitting, normally male-threaded at both ends. In instrument setups, it connects the female-threaded ports on valves, manifolds, instruments, and other fittings. What Is a Pipe Nipple Used For? 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