{"id":15782,"date":"2026-09-28T01:33:39","date_gmt":"2026-09-28T01:33:39","guid":{"rendered":"https:\/\/npt-lok.com\/?p=15782"},"modified":"2026-09-28T01:33:54","modified_gmt":"2026-09-28T01:33:54","slug":"compression-vs-threaded-fitting-are-they-interchangeable","status":"publish","type":"post","link":"https:\/\/npt-lok.com\/id\/compression-vs-threaded-fitting\/","title":{"rendered":"Compression vs Threaded Fitting: Are They Interchangeable?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Absolutely no, but they can be connected using the appropriate adapter. Compression and NPT threaded connections use different sealing methods and sizing conventions. Even when both are labeled 1\/4 inch or 3\/8 inch, their connection ends are not interchangeable.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In this article, \u201cthreaded fitting\u201d mainly refers to NPT pipe threaded fittings, and the compression fittings discussed are primarily double-ferrule tube fittings.<\/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\">Daftar isi<\/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;\">Alihkan<\/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\/id\/compression-vs-threaded-fitting\/#What_Is_a_Compression_Fitting\" >What Is a Compression Fitting?<\/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\/id\/compression-vs-threaded-fitting\/#What_Is_a_Threaded_Fitting\" >What Is a Threaded Fitting?<\/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\/id\/compression-vs-threaded-fitting\/#Compression_vs_Threaded_Fittings\" >Compression vs Threaded Fittings<\/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\/id\/compression-vs-threaded-fitting\/#Different_Sealing_Principles\" >Different Sealing Principles<\/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\/id\/compression-vs-threaded-fitting\/#Different_Sizing_Conventions\" >Different Sizing Conventions<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/npt-lok.com\/id\/compression-vs-threaded-fitting\/#Are_Compression_and_NPT_Threaded_Fittings_Interchangeable\" >Are Compression and NPT Threaded Fittings Interchangeable?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/npt-lok.com\/id\/compression-vs-threaded-fitting\/#Can_You_Swap_the_Connection_Ends_Directly\" >Can You Swap the Connection Ends Directly?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/npt-lok.com\/id\/compression-vs-threaded-fitting\/#Can_You_Connect_Them_Using_an_Adapter\" >Can You Connect Them Using an Adapter?<\/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\/id\/compression-vs-threaded-fitting\/#Can_You_Replace_an_Existing_Connection_Arrangement\" >Can You Replace an Existing Connection Arrangement?<\/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\/id\/compression-vs-threaded-fitting\/#Which_Should_You_Choose_Compression_or_NPT_Threaded_Fittings\" >Which Should You Choose: Compression or NPT Threaded Fittings?<\/a><\/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\/id\/compression-vs-threaded-fitting\/#FAQ\" >Pertanyaan yang Sering Diajukan (FAQ)<\/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\/id\/compression-vs-threaded-fitting\/#Q1_Should_I_put_teflon_tape_on_a_compression_fitting%EF%BC%9F\" >Q1. Should I put teflon tape on a compression fitting\uff1f<\/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\/id\/compression-vs-threaded-fitting\/#Q2_Can_I_overtighten_a_compression_fitting\" >Q2. Can I overtighten a compression fitting?<\/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\/id\/compression-vs-threaded-fitting\/#Q3_Is_38_compression_the_same_as_38_NPT\" >Q3. Is 3\/8 compression the same as 3\/8 NPT?<\/a><\/li><\/ul><\/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\/id\/compression-vs-threaded-fitting\/#Contact_Us\" >Hubungi kami<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_a_Compression_Fitting\"><\/span><span style=\"font-weight: 400;\">What Is a Compression Fitting?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A <\/span><a href=\"https:\/\/npt-lok.com\/id\/fitting-kompresi\/\"><span style=\"font-weight: 400;\">fitting kompresi<\/span><\/a><span style=\"font-weight: 400;\"> connects and seals tubing without threading or welding the tube. <\/span><a href=\"https:\/\/npt-lok.com\/id\/fitting-ferrule-ganda\/\"><span style=\"font-weight: 400;\">Double-ferrule fittings<\/span><\/a><span style=\"font-weight: 400;\"> consist of four parts: a body, a front ferrule, a back ferrule, and a nut. Tightening the nut drives the ferrules into position to seal and grip the tube.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15783 size-full aligncenter\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/09\/01-double-ferrule-components-e1790558759534.jpg\" alt=\"Disassembled double-ferrule tube fitting showing the nut, back ferrule, front ferrule, and body.\" width=\"750\" height=\"199\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/09\/01-double-ferrule-components-e1790558759534.jpg 750w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/09\/01-double-ferrule-components-e1790558759534-18x5.jpg 18w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_a_Threaded_Fitting\"><\/span><span style=\"font-weight: 400;\">What Is a Threaded Fitting?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A threaded fitting connects components through matching<\/span><a href=\"https:\/\/npt-lok.com\/id\/benang-jantan-vs-benang-betina\/\"><span style=\"font-weight: 400;\"> benang pria dan wanita<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><a href=\"https:\/\/npt-lok.com\/id\/alat-kelengkapan-pipa-instrumentasi\/sambungan-npt\/\"><span style=\"font-weight: 400;\">Sambungan NPT<\/span><\/a><span style=\"font-weight: 400;\"> use tapered pipe threads and normally require suitable <\/span><a href=\"https:\/\/npt-lok.com\/id\/connect-and-seal-npt-threads\/\"><span style=\"font-weight: 400;\">thread sealant<\/span><\/a><span style=\"font-weight: 400;\"> for a pressure-tight connection. Other threaded designs may use O-rings, gaskets, or separate sealing surfaces.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15784 aligncenter\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/09\/02-threaded-hex-nipple-e1790558851699.jpg\" alt=\"Stainless steel hex nipple with male pipe threads at both ends.\" width=\"430\" height=\"301\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/09\/02-threaded-hex-nipple-e1790558851699.jpg 750w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/09\/02-threaded-hex-nipple-e1790558851699-18x12.jpg 18w\" sizes=\"auto, (max-width: 430px) 100vw, 430px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Compression_vs_Threaded_Fittings\"><\/span><span style=\"font-weight: 400;\">Compression vs Threaded Fittings<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Both connection types can provide reliable service when correctly selected and installed. Their main differences are how they seal and how they are sized.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Different_Sealing_Principles\"><\/span><span style=\"font-weight: 400;\">Different Sealing Principles<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Compression fittings seal through ferrule action.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As the nut tightens, it drives the front and back ferrules axially along the tube. The front ferrule forms sealing contact with the tube and fitting body, while the back ferrule supports the gripping action. This controlled movement helps limit twisting of the tube during assembly.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The nut threads apply the assembly force; they do not form the fluid seal. Reliable performance depends on tubing with the specified OD, wall thickness, hardness, and surface condition, together with correct installation.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">NPT fittings seal at the tapered thread connection.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">NPT threads change diameter along their length. As matching male and female threads engage, the connection becomes progressively tighter. Suitable PTFE tape or pipe thread sealant is normally required to fill leakage paths between the threads. Select a sealant compatible with the fluid, fitting materials, and operating temperature, and follow the manufacturer\u2019s application instructions.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Different_Sizing_Conventions\"><\/span><span style=\"font-weight: 400;\">Different Sizing Conventions<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Compression tube fittings are sized by<\/span><a href=\"https:\/\/npt-lok.com\/id\/tube-fittings-dimensions-how-to-read-sizes-standards\/\"><span style=\"font-weight: 400;\"> the outside diameter (OD)<\/span><\/a><span style=\"font-weight: 400;\"> of the tubing they accept, while NPT fittings use nominal pipe thread sizes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A 3\/8-inch compression fitting accepts tubing with an actual OD of 3\/8 inch. In contrast, 3\/8 NPT does not mean that the bore or thread outside diameter measures 3\/8 inch. The same distinction applies to 1\/4-inch connections.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Matching size labels therefore do not make the two connection ends compatible.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Are_Compression_and_NPT_Threaded_Fittings_Interchangeable\"><\/span><span style=\"font-weight: 400;\">Are Compression and NPT Threaded Fittings Interchangeable?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The connection ends cannot be swapped directly. An adapter can join them, while replacing an existing connection arrangement requires additional compatibility checks.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_You_Swap_the_Connection_Ends_Directly\"><\/span><span style=\"font-weight: 400;\">Can You Swap the Connection Ends Directly?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">No. A compression connection end cannot directly replace an NPT connection end.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A compression nut is designed to engage its matching fitting body and load the ferrules. It is not a substitute for an NPT female port. Likewise, an NPT male fitting does not provide the matching ferrule seat required by a compression connection.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The differences include thread dimensions, pitch, taper, and sealing geometry. Even if two parts appear to engage, that does not establish a pressure-tight or mechanically reliable connection.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Do not force mismatched components together or use extra tape to compensate for an incorrect fit.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_You_Connect_Them_Using_an_Adapter\"><\/span><span style=\"font-weight: 400;\">Can You Connect Them Using an <\/span><a href=\"https:\/\/npt-lok.com\/id\/adaptor-tabung-pria\/\"><span style=\"font-weight: 400;\">Adapter<\/span><\/a><span style=\"font-weight: 400;\">?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Yes. Use a connector with a compression end for the tubing and an NPT end for the equipment port.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Select the two ends independently. For example, suppose your tube OD is 3\/8 inch and the valve port is 1\/4-inch female NPT. The required connection arrangement is 3\/8 in. Tube OD \u00d7 1\/4 in. Male NPT, subject to material and operating-condition checks.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15785 aligncenter\" src=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/09\/03-compression-to-male-thread-connector.jpg\" alt=\"Tube connector with a compression nut on the left and a male threaded connection on the right.\" width=\"451\" height=\"451\" srcset=\"https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/09\/03-compression-to-male-thread-connector.jpg 750w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/09\/03-compression-to-male-thread-connector-150x150.jpg 150w, https:\/\/npt-lok.com\/wp-content\/uploads\/2026\/09\/03-compression-to-male-thread-connector-12x12.jpg 12w\" sizes=\"auto, (max-width: 451px) 100vw, 451px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Choosing a 3\/8 NPT end simply because the tube is 3\/8 inch would be incorrect.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><span style=\"font-weight: 400;\">Tube OD<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Equipment port<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Required connector<\/span><\/td>\n<td><span style=\"font-weight: 400;\">NPTLOK model<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1\/4 in.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1\/4 in. Female NPT<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1\/4 in. Tube OD \u00d7 1\/4 in. Male NPT<\/span><\/td>\n<td><span style=\"font-weight: 400;\">SS-FT4-MN4<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">3\/8 in.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1\/4 in. Female NPT<\/span><\/td>\n<td><span style=\"font-weight: 400;\">3\/8 in. Tube OD \u00d7 1\/4 in. Male NPT<\/span><\/td>\n<td><span style=\"font-weight: 400;\">SS-FT6-MN4<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">3\/8 in.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">3\/8 in. Female NPT<\/span><\/td>\n<td><span style=\"font-weight: 400;\">3\/8 in. Tube OD \u00d7 3\/8 in. Male NPT<\/span><\/td>\n<td><span style=\"font-weight: 400;\">SS-FT6-MN6<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span class=\"ez-toc-section\" id=\"Can_You_Replace_an_Existing_Connection_Arrangement\"><\/span><span style=\"font-weight: 400;\">Can You Replace an Existing Connection Arrangement?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Yes, but changing the connection method may require replacing the tube or pipe section and its mating fittings. It is not a direct exchange of connection ends.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Do not clamp compression ferrules onto an externally threaded pipe surface; the ferrules require a suitable, smooth tube sealing area.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Before making the change, verify:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-checked=\"false\" aria-level=\"1\"><span style=\"font-weight: 400;\">Connection compatibility: Confirm tube OD, thread standard, nominal size, and male\/female configuration.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-checked=\"false\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tubing suitability: Check material, wall thickness, hardness, roundness, and sealing-area condition.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-checked=\"false\" aria-level=\"1\"><span style=\"font-weight: 400;\">Operating requirements: Verify fluid compatibility and pressure and temperature limits for the complete assembly.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-checked=\"false\" aria-level=\"1\"><span style=\"font-weight: 400;\">Installation feasibility: Check available space, alignment, tube support, and vibration conditions.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-checked=\"false\" aria-level=\"1\"><span style=\"font-weight: 400;\">Post-installation verification: Complete the inspection and leak testing required by the application.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Which_Should_You_Choose_Compression_or_NPT_Threaded_Fittings\"><\/span><span style=\"font-weight: 400;\">Which Should You Choose: Compression or NPT Threaded Fittings?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Choose according to the existing connection points and the system\u2019s requirements. Neither design is universally stronger, more reliable, or more economical.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For suitable tubing connections, consider double-ferrule compression fittings. They connect tubing without threading or welding the tube end and can be disassembled and reassembled according to the manufacturer\u2019s instructions. Check tube OD, wall thickness, material, hardness, surface condition, and installation access.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For components with matching NPT ports, choose an appropriate NPT fitting. Confirm the thread size and male\/female configuration, and allow enough space to assemble the connection correctly.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For tubing connected to an NPT equipment port, choose a compression-to-NPT connector. Select each end independently and verify the pressure and temperature limits of the complete assembly, including the tubing and connected equipment.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span><span style=\"font-weight: 400;\">Pertanyaan yang Sering Diajukan (FAQ)<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Q1_Should_I_put_teflon_tape_on_a_compression_fitting%EF%BC%9F\"><\/span><span style=\"font-weight: 400;\">Q1. Should I put teflon tape on a compression fitting\uff1f<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">No, do not use Teflon tape on the ferrule end of a compression fitting. The seal forms at the ferrule, not the threads. Tape can interfere with tightening and cause leaks. However, if the fitting has an NPT male end, that threaded end does require Teflon tape or sealant.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q2_Can_I_overtighten_a_compression_fitting\"><\/span><span style=\"font-weight: 400;\">Q2. Can I overtighten a compression fitting?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Yes. Overtightening can damage the ferrules, tubing, or threads and cause leakage. Follow the installation instructions for the specific fitting size and series; initial assembly and reassembly require different procedures. If a connection leaks, isolate and depressurize the system before inspecting it rather than continuing to tighten the nut.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q3_Is_38_compression_the_same_as_38_NPT\"><\/span><span style=\"font-weight: 400;\">Q3. Is 3\/8 compression the same as 3\/8 NPT?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">No. 3\/8 compression refers to 3\/8-inch tube outside diameter (OD), about 0.375 inch. 3\/8 NPT is a nominal pipe thread size with an actual thread OD of about 0.675 inch. They are not interchangeable and cannot be directly threaded together. Use an adapter.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Contact_Us\"><\/span><span style=\"font-weight: 400;\">Hubungi kami<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Need to connect tubing to an NPT port?<\/span><\/p>\n<p><a href=\"https:\/\/npt-lok.com\/id\/tentang-kami\/\"><span style=\"font-weight: 400;\">NPTLOK<\/span><\/a><span style=\"font-weight: 400;\"> offers double-ferrule tube fittings, NPT pipe fittings, and tube-to-thread connectors for different system layouts.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Send us your tube outside diameter, tube material and wall thickness, port thread specification, fluid, operating pressure, and temperature. If the connection type is uncertain, include a drawing or clear photograph for identification.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Unduh <\/span><a href=\"https:\/\/npt-lok.com\/id\/unduh-katalog-produk\/\"><span style=\"font-weight: 400;\">Our catalog<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><a href=\"https:\/\/npt-lok.com\/id\/hubungi-untuk-penawaran-harga\/\"><span style=\"font-weight: 400;\">Contact NPTLOK<\/span><\/a><span style=\"font-weight: 400;\"> for fitting selection support and a quotation.<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Absolutely no, but they can be connected using the appropriate adapter. Compression and NPT threaded connections use different sealing methods and sizing conventions. Even when both are labeled 1\/4 inch or 3\/8 inch, their connection ends are not interchangeable.\u00a0 In this article, \u201cthreaded fitting\u201d mainly refers to NPT pipe threaded fittings, and the compression fittings [&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-15782","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>Compression vs Threaded Fitting: Are They Interchangeable? - NPTLOK Instrumentation Tube Fittings and Valves<\/title>\n<meta name=\"description\" content=\"Are compression and NPT threaded fittings interchangeable? 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