{"id":15804,"date":"2026-10-10T08:20:22","date_gmt":"2026-10-10T08:20:22","guid":{"rendered":"https:\/\/npt-lok.com\/?p=15804"},"modified":"2026-10-10T08:20:41","modified_gmt":"2026-10-10T08:20:41","slug":"how-to-measure-pipe-nipple-length-accurately","status":"publish","type":"post","link":"https:\/\/npt-lok.com\/ar\/how-to-measure-pipe-nipple-length\/","title":{"rendered":"\u00a0How to Measure Pipe Nipple Length Accurately"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Pipe nipple length can be confusing, especially when you\u2019re choosing a part for a specific installation gap. You might order the right length, but after installation the gap between the fittings is smaller than expected. That\u2019s because overall length includes both threaded ends, and part of each end sits inside the mating connection.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Below, we\u2019ll go through how to measure pipe nipple length, how to read the length chart, and how thread engagement affects the length you need.<\/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\/how-to-measure-pipe-nipple-length\/#Pipe_Nipple_Length_Chart\" >Pipe Nipple Length Chart<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/npt-lok.com\/ar\/how-to-measure-pipe-nipple-length\/#Reading_the_chart_12-inch_NPT_nipples\" >Reading the chart: 1\/2-inch NPT nipples<\/a><\/li><\/ul><\/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\/how-to-measure-pipe-nipple-length\/#How_to_Measure_Pipe_Nipple_Length\" >How to Measure Pipe Nipple Length\u00a0<\/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\/how-to-measure-pipe-nipple-length\/#Find_the_length_reference\" >Find the length reference<\/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\/how-to-measure-pipe-nipple-length\/#Measure_between_the_end_faces\" >Measure between the end faces<\/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\/how-to-measure-pipe-nipple-length\/#Check_the_drawing_and_tolerance\" >Check the drawing and tolerance<\/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\/how-to-measure-pipe-nipple-length\/#Overall_Length_vs_Installed_Gap\" >Overall Length vs. Installed Gap\u00a0<\/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\/how-to-measure-pipe-nipple-length\/#Check_the_fit_using_dimensions\" >Check the fit using dimensions<\/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\/how-to-measure-pipe-nipple-length\/#Thread_length_%E2%89%A0_does_not_equal_insertion_depth\" >Thread length \u2260 does not equal insertion depth<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/npt-lok.com\/ar\/how-to-measure-pipe-nipple-length\/#Common_Pipe_Nipple_Length_Options\" >Common Pipe Nipple Length Options\u00a0<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/npt-lok.com\/ar\/how-to-measure-pipe-nipple-length\/#Close_nipples\" >Close nipples<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/npt-lok.com\/ar\/how-to-measure-pipe-nipple-length\/#Hex_long_nipples\" >Hex long nipples<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/npt-lok.com\/ar\/how-to-measure-pipe-nipple-length\/#FAQ\" >\u0627\u0644\u062a\u0639\u0644\u064a\u0645\u0627\u062a<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/npt-lok.com\/ar\/how-to-measure-pipe-nipple-length\/#Q1_Does_pipe_nipple_length_include_the_threads\" >Q1. Does pipe nipple length include the threads?<\/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\/how-to-measure-pipe-nipple-length\/#Q2_Is_a_12-inch_pipe_nipple_12_inch_long\" >Q2. Is a 1\/2-inch pipe nipple 1\/2 inch long?<\/a><\/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\/how-to-measure-pipe-nipple-length\/#Q3_How_long_is_a_close_nipple\" >Q3. How long is a close nipple?<\/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\/how-to-measure-pipe-nipple-length\/#Q4_How_do_I_choose_a_nipple_length_for_a_fixed_gap\" >Q4. How do I choose a nipple length for a fixed gap?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/npt-lok.com\/ar\/how-to-measure-pipe-nipple-length\/#Contact_Us\" >\u0627\u062a\u0635\u0644 \u0628\u0646\u0627<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Pipe_Nipple_Length_Chart\"><\/span><span style=\"font-weight: 400;\">Pipe Nipple Length Chart<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The following table lists male NPT close nipples and hex long nipples.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Nominal NPT Size<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Close Nipple Overall Length, in. (mm)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Hex Long Nipple Overall Length Options, in. (mm)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1\/16<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.75 (19.1)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211;<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1\/8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0.75 (19.1)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.50 (38.1), 2.00 (50.8), 2.50 (63.5), 3.00 (76.2)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1\/4<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.12 (28.4)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.50 (38.1), 2.00 (50.8), 2.50 (63.5), 3.00 (76.2), 4.00 (101.6)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">3\/8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.12 (28.4)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.50 (38.1), 2.00 (50.8), 2.50 (63.5), 3.00 (76.2), 4.00 (101.6)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1\/2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.50 (38.1)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">2.00 (50.8), 3.00 (76.2), 4.00 (101.6), 6.00 (152.4)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">3\/4<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.50 (38.1)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">2.00 (50.8), 3.00 (76.2), 4.00 (101.6)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.88 (47.8)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">3.00 (76.2), 4.00 (101.6)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Lengths are shown in inches, with millimeter equivalents in parentheses. Overall length includes both threaded ends.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Reading_the_chart_12-inch_NPT_nipples\"><\/span><span style=\"font-weight: 400;\">Reading the chart: 1\/2-inch NPT nipples<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">A 1\/2-inch NPT nipple does not have one fixed length. The catalog lists:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">\u0645\u0646\u062a\u062c<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ordering Number<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Overall Length<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Close nipple<\/span><\/td>\n<td><span style=\"font-weight: 400;\">SS-CN-MN8<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1.50 in. (38.1 mm)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Hex long nipple<\/span><\/td>\n<td><span style=\"font-weight: 400;\">SS-HL-MN8-2<\/span><\/td>\n<td><span style=\"font-weight: 400;\">2.00 in. (50.8 mm)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Hex long nipple<\/span><\/td>\n<td><span style=\"font-weight: 400;\">SS-HL-MN8-3<\/span><\/td>\n<td><span style=\"font-weight: 400;\">3.00 in. (76.2 mm)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Hex long nipple<\/span><\/td>\n<td><span style=\"font-weight: 400;\">SS-HL-MN8-4<\/span><\/td>\n<td><span style=\"font-weight: 400;\">4.00 in. (101.6 mm)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Hex long nipple<\/span><\/td>\n<td><span style=\"font-weight: 400;\">SS-HL-MN8-6<\/span><\/td>\n<td><span style=\"font-weight: 400;\">6.00 in. (152.4 mm)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">All five share the same <\/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\/%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;\"> connection size, but their overall lengths are different. When you order, specify both the thread size and the length.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Measure_Pipe_Nipple_Length\"><\/span><span style=\"font-weight: 400;\">How to Measure Pipe Nipple Length\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Find_the_length_reference\"><\/span><span style=\"font-weight: 400;\">Find the length reference<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Check the product drawing before measuring. L runs between the two end faces, including the threaded portions.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The hex length, unthreaded center section, and individual threaded-end dimensions describe different features. None replaces the overall length.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Measure_between_the_end_faces\"><\/span><span style=\"font-weight: 400;\">Measure between the end faces<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">For short nipples, use a caliper. Put the jaws flat on both ends and keep it parallel to the nipple. For hex long nipples, use a ruler or tape that can hold the required tolerance. Wipe the ends clean first\u2014dirt can throw off the reading. Close nipples are the same: measure end to end, even if there\u2019s no visible unthreaded section in the middle.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Check_the_drawing_and_tolerance\"><\/span><span style=\"font-weight: 400;\">Check the drawing and tolerance<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Record the length and unit, then compare the result with the product drawing. For example, a measured overall length of 50.8 mm equals 2.00 inches. This is separate from the nipple\u2019s nominal thread size.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If your project requires a length tolerance, state it on the drawing or purchase specification. The catalog length alone does not define the permitted manufacturing variation.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Measure a loose nipple whenever possible. On an installed nipple, the visible section excludes the portions inside the ports.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Overall_Length_vs_Installed_Gap\"><\/span><span style=\"font-weight: 400;\">Overall Length vs. Installed Gap\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A 2-inch nipple does not create a 2-inch gap between two fittings. Both ends enter the female ports.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Here, the installed gap means the axial distance between the entrance faces of the two female connections. It does not mean valve center-to-center distance or the distance between internal shoulders.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15808 aligncenter\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/06-overall-vs-installed.jpeg\" alt=\"Overall length is measured end to end; installed gap is measured between the entrance faces of the mating fittings.\" width=\"573\" height=\"322\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/06-overall-vs-installed.jpeg 800w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/06-overall-vs-installed-768x432.jpeg 768w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/06-overall-vs-installed-18x10.jpeg 18w\" sizes=\"auto, (max-width: 573px) 100vw, 573px\" \/>For this layout:<\/span><\/p>\n<p><b><i>Installed gap = Overall length \u2212 Insertion depth at each end<\/i><\/b><\/p>\n<p><span style=\"font-weight: 400;\">The calculation is simple. The insertion depths require confirmation.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Check_the_fit_using_dimensions\"><\/span><span style=\"font-weight: 400;\">Check the fit using dimensions<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Consider the SS-HL-MN8-2, a 1\/2-inch NPT hex long nipple with an overall length of 50.8 mm.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If the two female-port faces are 50 mm apart, only 0.8 mm in total remains for insertion into both ports. This nipple cannot provide the required thread engagement across that gap.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The next listed length, SS-HL-MN8-3, measures 76.2 mm. It leaves 26.2 mm in total for the two connections to take up while maintaining a 50 mm gap.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">That makes it a candidate to check\u2014not a confirmed selection. Confirm the assembled insertion depths and dimensional tolerances before ordering.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Thread_length_%E2%89%A0_does_not_equal_insertion_depth\"><\/span><span style=\"font-weight: 400;\">Thread length \u2260 does not equal insertion depth<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">NPT threads are tapered. Tightening advances the male end farther into the female connection, so the final insertion depth differs from the initial hand-tight position.<img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-15809 aligncenter\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/07-thread-engagement.png\" alt=\"A indicates hand-tight engagement; B indicates additional wrench-tight engagement. Final insertion depth must be confirmed for the actual assembly.\" width=\"576\" height=\"302\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/07-thread-engagement.png 576w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/07-thread-engagement-18x9.png 18w\" sizes=\"auto, (max-width: 576px) 100vw, 576px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Keep these dimensions separate:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Overall length: the distance between the nipple\u2019s end faces.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Threaded-end length: the dimension of the threaded portion shown on the applicable drawing.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Assembly insertion depth: how far the nipple enters the mating port after assembly.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Do not use a drawing\u2019s threaded-end length as the actual insertion depth. Follow the applicable assembly instructions and confirm the fit with the mating components. For a tightly controlled gap, check an assembled sample.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Also check the assembly sequence. A conventional nipple with right-hand threads at both ends cannot simply screw into two fixed, non-rotating female connections at once. The layout may need a union or another suitable connection arrangement.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Common_Pipe_Nipple_Length_Options\"><\/span><span style=\"font-weight: 400;\">Common Pipe Nipple Length Options\u00a0<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Close_nipples\"><\/span><span style=\"font-weight: 400;\">Close nipples<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Close nipples have little or no unthreaded section between their threaded ends. They provide a compact connection.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15806 aligncenter\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/02-close-nipple-overall-length.png\" alt=\"A close nipple is also measured end to end, including the threads.\" width=\"266\" height=\"179\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/02-close-nipple-overall-length.png 500w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/02-close-nipple-overall-length-18x12.png 18w\" sizes=\"auto, (max-width: 266px) 100vw, 266px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">For instance:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The 1\/8-inch close nipple measures 19.1 mm overall.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The 1\/4-inch and 3\/8-inch close nipples measure 28.4 mm.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The 1\/2-inch and 3\/4-inch close nipples measure 38.1 mm.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The 1-inch close nipple measures 47.8 mm.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Check the size-specific drawing rather than choosing a close nipple by name alone.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Hex_long_nipples\"><\/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\/%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;\">Hex long nipples<\/span><\/a><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Hex long nipples give you a longer overall length plus a hex section you can put a wrench on. They work well when you need more distance between components\u2014as long as the thread engagement and assembly method are right.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15805 aligncenter\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/01-hex-long-nipple-overall-length.png\" alt=\"Overall length L is measured between the two end faces, including both threaded ends.\" width=\"304\" height=\"152\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/01-hex-long-nipple-overall-length.png 1233w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/01-hex-long-nipple-overall-length-768x384.png 768w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/10\/01-hex-long-nipple-overall-length-18x9.png 18w\" sizes=\"auto, (max-width: 304px) 100vw, 304px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Available lengths vary by thread size. For example, 1\/2-inch NPT hex long nipples in 2, 3, 4, and 6-inch lengths, while the 1-inch NPT versions appear in 3 and 4-inch lengths.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Check wrench clearance as well as overall length. Enough space for the part does not always mean enough space to assemble it.<\/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<h3><span class=\"ez-toc-section\" id=\"Q1_Does_pipe_nipple_length_include_the_threads\"><\/span><span style=\"font-weight: 400;\">Q1. Does pipe nipple length include the threads?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Yes. Overall length includes both threaded ends. Measure between the two end faces, not just across the center section.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q2_Is_a_12-inch_pipe_nipple_12_inch_long\"><\/span><span style=\"font-weight: 400;\">Q2. Is a 1\/2-inch pipe nipple 1\/2 inch long?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">No. In \u201c1\/2-inch NPT nipple,\u201d 1\/2 inch identifies the nominal thread size. Specify the overall length separately.\u00a0<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q3_How_long_is_a_close_nipple\"><\/span><span style=\"font-weight: 400;\">Q3. How long is a close nipple?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Length varies by nominal size and product design. In our catalog, the 1\/4-inch NPT close nipple measures 28.4 mm, while the 1\/2-inch version measures 38.1 mm overall.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q4_How_do_I_choose_a_nipple_length_for_a_fixed_gap\"><\/span><span style=\"font-weight: 400;\">Q4. How do I choose a nipple length for a fixed gap?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Define the gap between the two port entrance faces. Then account for the confirmed insertion depth at each end.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Check tolerances, wrench clearance, and the assembly sequence before selecting the length. If both mating components are fixed, the connection arrangement may require a union.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Contact_Us\"><\/span><span style=\"font-weight: 400;\">\u0627\u062a\u0635\u0644 \u0628\u0646\u0627<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">\u0644\u0642\u062f \u0642\u0627\u0645\u062a \u0634\u0631\u0643\u0629 NPTLOK \u0628\u062a\u0635\u0646\u064a\u0639 <\/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\/\"><span style=\"font-weight: 400;\">instrumentation fittings<\/span><\/a><span style=\"font-weight: 400;\"> \u0648 <\/span><a href=\"https:\/\/npt-lok.com\/ar\/%d8%b5%d9%85%d8%a7%d9%85-%d8%a7%d9%84%d8%a3%d8%ac%d9%87%d8%b2%d8%a9\/\"><span style=\"font-weight: 400;\">\u0627\u0644\u0635\u0645\u0627\u0645\u0627\u062a<\/span><\/a><span style=\"font-weight: 400;\">, including <\/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\/%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\u0627\u062a \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628<\/span><\/a><span style=\"font-weight: 400;\">, for over 20 years. We supply standard products and custom configurations with competitive pricing and responsive service.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">We make <\/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\/%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 nipples<\/span><\/a><span style=\"font-weight: 400;\">, hex long nipples, and close nipples. Depending on the series, you can choose <\/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;\">316 stainless steel<\/span><\/a><span style=\"font-weight: 400;\">, carbon steel, or <\/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\/%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;\">\u0646\u062d\u0627\u0633<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><a href=\"https:\/\/npt-lok.com\/ar\/pipe-thread-types-and-size-explained\/\"><span style=\"font-weight: 400;\">Threading options<\/span><\/a><span style=\"font-weight: 400;\"> include NPT to ASME B1.20.1 and SAE AS71051; BSP\/ISO parallel to ISO 228 and JIS B0202; and BSP\/ISO tapered to ISO 7-1, BS EN 10226-1, and JIS B0203. What&#8217;s available depends on the product you select.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The NPT nipples listed in this guide cover nominal sizes from 1\/16 to 1 inch and overall lengths from 0.75 to 6 inches. Available lengths vary by size and nipple type.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Need a special length or connection? We do custom too. Send us your drawing, thread specs, material requirements, and operating conditions. Be clear about whether the dimension you need is the overall length or the installed gap.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">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><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 style=\"font-weight: 400;\"> to confirm your pipe nipple specs and request a quote.<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Pipe nipple length can be confusing, especially when you\u2019re choosing a part for a specific installation gap. You might order the right length, but after installation the gap between the fittings is smaller than expected. That\u2019s because overall length includes both threaded ends, and part of each end sits inside the mating connection. Below, we\u2019ll [&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-15804","post","type-post","status-publish","format-standard","hentry","category-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - 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