{"id":15531,"date":"2026-08-06T01:46:06","date_gmt":"2026-08-06T01:46:06","guid":{"rendered":"https:\/\/npt-lok.com\/?p=15531"},"modified":"2026-08-13T05:09:42","modified_gmt":"2026-08-13T05:09:42","slug":"hex-nipple-types-materials-threads-sizing","status":"publish","type":"post","link":"https:\/\/npt-lok.com\/de\/hex-nipple-types\/","title":{"rendered":"Hex Nipple Types: Materials, Threads &#038; Sizing"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Getting the <\/span><a href=\"https:\/\/npt-lok.com\/de\/instrumentierungsrohrverschraubungen\/sechskantnippel\/\"><span style=\"font-weight: 400;\">Sechskantnippel<\/span><\/a><span style=\"font-weight: 400;\"> wrong means thread mismatch, leaks, or a fitting that fails sooner than it should. Therefore, it is very essential to choose the right type for your needs. This guide explains hex nipple types, materials, thread options, sizes, and how to select the right hex nipple for your application.<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-13455\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2024\/07\/Hex-nipple-banner-e1785980101263.jpg\" alt=\"Hex-Nippel-Banner\" width=\"1010\" height=\"472\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2024\/07\/Hex-nipple-banner-e1785980101263.jpg 1010w, https:\/\/npt-lok.com\/wp-content\/uploads\/2024\/07\/Hex-nipple-banner-e1785980101263-768x359.jpg 768w, https:\/\/npt-lok.com\/wp-content\/uploads\/2024\/07\/Hex-nipple-banner-e1785980101263-18x8.jpg 18w\" sizes=\"auto, (max-width: 1010px) 100vw, 1010px\" \/><\/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\">Inhaltsverzeichnis<\/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;\">Umschalten<\/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\/de\/hex-nipple-types\/#What_is_a_Hex_Nipple\" >What is a Hex Nipple?<\/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\/de\/hex-nipple-types\/#Hex_Nipple_Types\" >Hex Nipple Types<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/npt-lok.com\/de\/hex-nipple-types\/#Standard_Hex_Nipple_%E2%80%93_HN_Series\" >Standard Hex Nipple \u2013 HN Series<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/npt-lok.com\/de\/hex-nipple-types\/#Long_Hex_Nipple_%E2%80%93_HL_Series\" >Long Hex Nipple \u2013 HL Series<\/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\/de\/hex-nipple-types\/#Reducing_Hex_Nipple\" >Reducing Hex 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\/de\/hex-nipple-types\/#Special_Pipe_Nipples_%E2%80%93_SPN_Series\" >Special Pipe Nipples \u2013 SPN Series<\/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\/de\/hex-nipple-types\/#Hex_Nipple_Materials\" >Hex Nipple Materials<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/npt-lok.com\/de\/hex-nipple-types\/#Hex_Nipple_Thread_Options\" >Hex Nipple Thread Options<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/npt-lok.com\/de\/hex-nipple-types\/#Selection_Guide\" >Selection Guide<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/npt-lok.com\/de\/hex-nipple-types\/#Step_1_Confirm_Material\" >Step 1: Confirm Material<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/npt-lok.com\/de\/hex-nipple-types\/#Step_2_Confirm_Thread_Standard_Size\" >Step 2: Confirm Thread Standard &amp; Size<\/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\/de\/hex-nipple-types\/#Step_3_Verify_Working_Pressure\" >Step 3: Verify Working Pressure<\/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\/de\/hex-nipple-types\/#Part_Number_Naming_Rule\" >Part Number Naming Rule<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/npt-lok.com\/de\/hex-nipple-types\/#FAQ\" >H\u00e4ufig gestellte Fragen<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/npt-lok.com\/de\/hex-nipple-types\/#Contact_Us\" >Kontaktieren Sie uns<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_is_a_Hex_Nipple\"><\/span><span style=\"font-weight: 400;\">What is a Hex Nipple?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A Hex Nipple is a short pipe fitting with male threads on both ends and a hexagonal (six-sided) center section between the threaded ends.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Feature<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Practical Value<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Hex center for wrench gripping<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Torque is applied to the hex flats, not the sealing threads<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Male threads on both ends<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Direct connection between two female-threaded ports \u2013 no additional adapters required<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Straight-through internal bore<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Minimizes flow restriction compared with internally restricted fittings<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Separate hex and thread sections<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Helps reduce thread damage during installation and maintenance<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">The hex flats are the key distinguishing feature. During installation, the wrench grips the hex flats rather than the threaded ends, reducing the risk of thread damage and making the fitting easier to install or remove during maintenance.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Hex_Nipple_Types\"><\/span><span style=\"font-weight: 400;\">Hex Nipple Types<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The main types include standard hex nipples, long hex nipples, reducing hex nipples, and special pipe nipples.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Standard_Hex_Nipple_%E2%80%93_HN_Series\"><\/span><span style=\"font-weight: 400;\">Standard Hex Nipple \u2013 HN Series<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-15345 alignleft\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/06\/Hex-nipples.png\" alt=\"Sechskantnippel\" width=\"191\" height=\"186\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/06\/Hex-nipples.png 191w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/06\/Hex-nipples-12x12.png 12w\" sizes=\"auto, (max-width: 191px) 100vw, 191px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">The HN series is the standard hex nipple. Both ends are male-threaded. They can be the same size or different, depending on your connection needs. The hex section is sized to give you good wrench grip without adding unnecessary bulk. It handles the bulk of general-purpose piping jobs.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The HN series is available in multiple thread configurations including NPT \u00d7 NPT, NPT \u00d7 ISO Tapered (RT), NPT \u00d7 ISO Parallel (RS), NPT \u00d7 SAE, and NPT \u00d7 Metric combinations. Standard sizes range from 1\/8&#8243; to 2&#8243; NPT.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Working pressure (316SS, ambient temperature):<\/span><\/p>\n<p><span style=\"font-weight: 400;\">1\/8&#8243; NPT: 10,000 psig<\/span><\/p>\n<p><span style=\"font-weight: 400;\">1\/4&#8243; NPT: 8,000 psig<\/span><\/p>\n<p><span style=\"font-weight: 400;\">3\/8&#8243; NPT: 7,800 psig<\/span><\/p>\n<p><span style=\"font-weight: 400;\">1\/2&#8243; NPT: 7,700 psig<\/span><\/p>\n<p><span style=\"font-weight: 400;\">3\/4&#8243; NPT: 7,300 psig<\/span><\/p>\n<p><span style=\"font-weight: 400;\">1&#8243; NPT: 5,300 psig<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Long_Hex_Nipple_%E2%80%93_HL_Series\"><\/span><a href=\"https:\/\/npt-lok.com\/de\/instrumentierungsrohrverschraubungen\/sechskant-langnippel\/\"><span style=\"font-weight: 400;\">Long Hex Nipple<\/span><\/a><span style=\"font-weight: 400;\"> \u2013 HL Series<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-15534 size-full\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/08\/hex-long-nipple-e1785980599890.png\" alt=\"Sechskant-Langnippel\" width=\"191\" height=\"135\" \/>The hexagonal mid-section of the HL series is longer than that of the standard series, providing a larger contact area for the wrench. This design is particularly useful in high-torque installation applications. The extended hexagonal face offers better leverage and a more secure grip for the wrench. It also allows the wrench to approach the joint from a wider range of angles in confined spaces.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Available standard lengths: 1.5&#8243;, 2&#8243;, 2.5&#8243;, 3&#8243;, 4&#8243;, and 6&#8243;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">These are useful for bulkhead connections through thick walls, transitions between flanges and pipework, or any high-torque application where a standard hex nipple doesn&#8217;t offer enough grip.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Reducing_Hex_Nipple\"><\/span><a href=\"https:\/\/npt-lok.com\/de\/hex-reducing-nipple\/\"><span style=\"font-weight: 400;\">Reducing Hex Nipple<\/span><\/a><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Reducing hex nipples have different thread sizes on each end, allowing direct connection between two ports with different diameters without additional adapters.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Our HN series supports reducing configurations. Simply specify different thread sizes for each end. For example, SS-HN-MN8-MN4 gives you 1\/2&#8243; NPT on one end and 1\/4&#8243; NPT on the other.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Common applications: large-bore pipe to small-bore equipment, pressure gauge hookups, or any transition between different pipe sizes.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Special_Pipe_Nipples_%E2%80%93_SPN_Series\"><\/span><span style=\"font-weight: 400;\">Special Pipe Nipples \u2013 SPN Series<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-15535 alignleft\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/08\/special-nipple-e1785980630289.png\" alt=\"special pipe nipple\" width=\"191\" height=\"116\" \/>For applications requiring custom lengths or non-standard configurations beyond standard, long, and close nipple options. The SPN series offers flexibility for specialized piping layouts where off-the-shelf nipples do not fit. Custom lengths and non-standard configurations are available.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Hex_Nipple_Materials\"><\/span><span style=\"font-weight: 400;\">Hex Nipple Materials<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>Edelstahl 316<\/b><span style=\"font-weight: 400;\"> offers the best corrosion resistance. Molybdenum content resists pitting and crevice corrosion. Use it for chemical, marine, saltwater, and aggressive media. <\/span><\/p>\n<p><b>304 Stainless Steel<\/b><span style=\"font-weight: 400;\"> costs less, still handles general industrial, food processing, and clean atmospheric conditions.<\/span><b> <\/b><\/p>\n<p><b>Kohlenstoffstahl<\/b><span style=\"font-weight: 400;\"> has high tensile strength for structural and general piping \u2014 zinc-plated for rust protection.<\/span><\/p>\n<p><a href=\"https:\/\/npt-lok.com\/de\/instrumentierungsrohrverschraubungen\/brass-hex-nipple\/\"><b>Messing<\/b><\/a><span style=\"font-weight: 400;\"> won&#8217;t spark \u2014 good for pneumatics, water lines, and explosive environments.<\/span> <b>Aluminum <\/b><span style=\"font-weight: 400;\">is for lightweight and specialty applications.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Material<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Code<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Bar Stock Standard<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Forging Standard<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Edelstahl 316<\/span><\/td>\n<td><span style=\"font-weight: 400;\">SS<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM A276<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM A182<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">304 Stainless Steel<\/span><\/td>\n<td><span style=\"font-weight: 400;\">S4<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM A276<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM A182<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kohlenstoffstahl<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM A108<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM A105<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Messing<\/span><\/td>\n<td><span style=\"font-weight: 400;\">B<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM B16\/B453<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM B283<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Aluminum<\/span><\/td>\n<td><span style=\"font-weight: 400;\">AL<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM B211<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASTM B247<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Hex_Nipple_Thread_Options\"><\/span><span style=\"font-weight: 400;\">Hex Nipple Thread Options<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The five thread standards listed below cover the vast majority of global piping systems.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Gewindestandard<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Specification<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Primary Market<\/span><\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/npt-lok.com\/de\/instrumentierungsrohrverschraubungen\/npt-anschlusse\/\"><span style=\"font-weight: 400;\">NVV<\/span><\/a><\/td>\n<td><span style=\"font-weight: 400;\">ASME B1.20.1, SAE AS71051<\/span><\/td>\n<td><span style=\"font-weight: 400;\">North America<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">ISO Tapered \/ BSPT<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ISO 7\/1, BS EN 10226-1, JIS B0203<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Europe, Asia<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">ISO Parallel \/ BSPP<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ISO 228, JIS B0202<\/span><\/td>\n<td><span style=\"font-weight: 400;\">European instrumentation<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">SAE (Unified)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ASME B1.1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Hydraulics, automotive<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Metrisch<\/span><\/td>\n<td><span style=\"font-weight: 400;\">DIN \/ JIS<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Metric-system regions<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><b>Common combinations<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">NPT \u00d7 NPT \u2013 North American standard piping systems<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">NPT \u00d7 ISO Tapered \u2013 Cross-standard connections (US equipment \u00d7 European piping)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">NPT \u00d7 ISO Parallel \u2013 US threads \u00d7 European straight-thread sealing<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">NPT \u00d7 Metric \u2013 US systems \u00d7 metric equipment interfaces<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Metric \u00d7 Metric \u2013 Full metric systems<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Selection_Guide\"><\/span><span style=\"font-weight: 400;\">Selection Guide<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Selecting the correct hex nipple for your project can be broken down into three straightforward steps.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Step_1_Confirm_Material\"><\/span><span style=\"font-weight: 400;\">Step 1: Confirm Material<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Base your material selection on operating conditions.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">316 Stainless Steel: corrosive media, saltwater, high temperature<\/span><\/p>\n<p><span style=\"font-weight: 400;\">304 Stainless Steel: general industrial, food processing, clean atmosphere<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Carbon Steel: structural, general piping (zinc-plated)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Brass: pneumatics, water lines, non-sparking<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Aluminum: lightweight, specialty<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Step_2_Confirm_Thread_Standard_Size\"><\/span><span style=\"font-weight: 400;\">Step 2: Confirm Thread Standard &amp; Size<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Check the mating port on your equipment or piping:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">North American equipment \/ US projects \u2192 NPT<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">European equipment \/ European projects \u2192 BSPT (ISO Tapered) or BSPP (ISO Parallel)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Japanese equipment \u2192 JIS (Metric)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">German equipment \u2192 DIN (Metric)<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Also verify whether both ends are the same size (straight nipple) or different sizes (reducing nipple). When in doubt, consult the equipment manufacturer&#8217;s documentation or use a thread gauge to confirm.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Measure length from end to end. This includes both threaded sections and the hex center. Do not measure only the threaded part. The overall length (L) determines the distance between the two connected ports. Too short, you cannot reach. Too long, it will not fit.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Step_3_Verify_Working_Pressure\"><\/span><span style=\"font-weight: 400;\">Step 3: Verify Working Pressure<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Once you have selected the material and thread configuration, confirm that the working pressure rating exceeds your system&#8217;s maximum operating pressure.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A few pressure rules to keep in mind: smaller size equals higher pressure \u2013 1\/8&#8243; NPT 316SS handles 10,000 psig, while 1&#8243; NPT drops to about 5,300 psig. 316 stainless steel ratings are approximately twice those of brass. Carbon steel and brass ratings are approximately 50% of 316SS ratings. Temperature reduces pressure capacity \u2013 for steam or hot oil service, use stainless steel and derate accordingly.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Always allow a reasonable safety margin between the rated pressure and your actual system pressure.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Part_Number_Naming_Rule\"><\/span><span style=\"font-weight: 400;\">Part Number Naming Rule<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Brief explanation of how to decode NPTLOK part numbers.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-15536\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/08\/discrimination.png\" alt=\"Part Number Naming Rule\" width=\"775\" height=\"255\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/08\/discrimination.png 775w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/08\/discrimination-768x253.png 768w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/08\/discrimination-18x6.png 18w\" sizes=\"auto, (max-width: 775px) 100vw, 775px\" \/><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Code Segment<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Meaning<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Options<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Material<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Material code<\/span><\/td>\n<td><span style=\"font-weight: 400;\">SS = 316SS, S4 = 304SS, C = Carbon Steel, B = Brass, AL = Aluminum<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Series<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Product family<\/span><\/td>\n<td><span style=\"font-weight: 400;\">HN = Hex Nipple, HL = Long Hex Nipple, CN = Close Nipple, SPN = Special Pipe Nipple<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Faden<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Thread type<\/span><\/td>\n<td><span style=\"font-weight: 400;\">MN = Male NPT, RT = ISO Tapered, RS = ISO Parallel<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Size<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Size designator<\/span><\/td>\n<td><span style=\"font-weight: 400;\">2 = 1\/8&#8243;, 4 = 1\/4&#8243;, 6 = 3\/8&#8243;, 8 = 1\/2&#8243;, 12 = 3\/4&#8243;, 16 = 1&#8243;<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span><span style=\"font-weight: 400;\">H\u00e4ufig gestellte Fragen<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Q1. What exactly is the difference between a close nipple and a hex nipple? Which one should I use?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A close nipple has no hex section \u2014 you have to grip the threads directly with a pipe wrench. That damages the threads. A hex nipple gives you a hex center for wrench grip, so threads stay untouched.Use a hex nipple for instrumentation, high-pressure, or any connection that may need disassembly later. Use a close nipple only for low-pressure, permanent installations where space is extremely tight.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Q2. How much pressure can a hexagonal fitting withstand?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Depends on material and size. 316SS ratings (ambient temperature):<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Size<\/span><\/td>\n<td><span style=\"font-weight: 400;\">316SS<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Messing<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1\/8&#8243; NPT<\/span><\/td>\n<td><span style=\"font-weight: 400;\">10,000 psig<\/span><\/td>\n<td><span style=\"font-weight: 400;\">5,000 psig<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1\/4&#8243; NPT<\/span><\/td>\n<td><span style=\"font-weight: 400;\">8,000 psig<\/span><\/td>\n<td><span style=\"font-weight: 400;\">4,000 psig<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1\/2&#8243; NPT<\/span><\/td>\n<td><span style=\"font-weight: 400;\">7,700 psig<\/span><\/td>\n<td><span style=\"font-weight: 400;\">3,800 psig<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1&#8243; NPT<\/span><\/td>\n<td><span style=\"font-weight: 400;\">5,300 psig<\/span><\/td>\n<td><span style=\"font-weight: 400;\">2,600 psig<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Q3. Can the length be customized?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Yes. Standard lengths: 1.5&#8243;, 2&#8243;, 2.5&#8243;, 3&#8243;, 4&#8243;, 6&#8243;. Custom lengths available. MOQ: 10 pieces. Contact us with your requirements.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Contact_Us\"><\/span><a href=\"https:\/\/npt-lok.com\/de\/kontaktieren-sie-uns-fur-ein-angebot\/\"><span style=\"font-weight: 400;\">Kontaktieren Sie uns<\/span><\/a><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">NPTLOK is a precision pipe fitting manufacturer serving instrumentation, hydraulic systems, chemical processing, oil &amp; gas, and power generation industries worldwide.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Our manufacturing facility is ISO 9001:2015 certified, and we operate both bar-stock and forging production lines to ensure full in-house quality control. Critical products undergo 100% pressure testing before shipment. Every fitting is marked with the NPTLOK manufacturer name for full traceability, and all male threads are capped for protection during shipping and storage.<\/span><\/p>\n<p>All external threads on NPTLOK hexagonal fittings are NPT standard rolled threads.<\/p>\n<p><span style=\"font-weight: 400;\">Download\u00a0 Our <a href=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2022\/12\/Catalog-of-Pipe-Fittings-NPTLOK.pdf\">Catalog<\/a><\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Getting the hex nipple wrong means thread mismatch, leaks, or a fitting that fails sooner than it should. Therefore, it is very essential to choose the right type for your needs. This guide explains hex nipple types, materials, thread options, sizes, and how to select the right hex nipple for your application. What is a [&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-15531","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>Hex Nipple Types: Materials, Threads &amp; Sizing - 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\/de\/hex-nipple-types\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hex Nipple Types: Materials, Threads &amp; Sizing - NPTLOK Instrumentation Tube Fittings and Valves\" \/>\n<meta property=\"og:description\" content=\"Getting the hex nipple wrong means thread mismatch, leaks, or a fitting that fails sooner than it should. 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Therefore, it is very essential to choose the right type for your needs. This guide explains hex nipple types, materials, thread options, sizes, and how to select the right hex nipple for your application. 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