{"id":1151,"date":"2026-02-02T08:00:15","date_gmt":"2026-02-02T13:00:15","guid":{"rendered":"http:\/\/blog.pasternack.com\/?p=1151"},"modified":"2026-02-27T15:00:07","modified_gmt":"2026-02-27T20:00:07","slug":"introduction-to-mil-prf-39012-and-mil-std-348-coaxial-connectors","status":"publish","type":"post","link":"\/blog\/coax-connectors\/introduction-to-mil-prf-39012-and-mil-std-348-coaxial-connectors\/","title":{"rendered":"Introduction to MIL-PRF-39012 and MIL-STD-348 Coaxial Connectors"},"content":{"rendered":"<p>To enable interoperability amongst RF systems, the military and industry rely on standardized dimensions and types of coaxial connectors. The two major standards that define coaxial connectors for the US military are MIL-STD-348 and MIL-PRF-39012. MIL-STD-348 provides the dimensions for control of the standard interfaces, while MIL-PRF-39012 defines the, detail specifications, materials, quality conformance, qualification, and verification for coaxial connectors. As a greater number of industries and applications adopt Hi-Rel coaxial cable assemblies, both MIL-PRF-39012 and MIL-STD-348 are becoming increasingly valuable in manufacturing and sourcing coaxial cable connectors and adapters. Hi-Rel coaxial connectors are used with virtually all RF devices and assemblies that require RF transmission line interconnect, other than waveguide. This includes common assemblies, such as amplifiers, transceivers, filters, antennas, mixers, attenuators, combiners\/splitters, couplers, and many other devices and components.<\/p>\n<p aria-level=\"3\"><b><span data-contrast=\"none\">Key Takeaways<\/span><\/b><span data-ccp-props=\"{&quot;134245418&quot;:false,&quot;134245529&quot;:false,&quot;335559738&quot;:280,&quot;335559739&quot;:80}\">\u00a0<\/span><\/p>\n<ul>\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"\" data-listid=\"2\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;multilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">\u2022 MIL-STD-348 provides the dimensional interface standard for RF connectors, ensuring interoperability across military systems.<\/span><span data-ccp-props=\"{&quot;335559738&quot;:240}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"\" data-listid=\"2\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;multilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\"> \u2022 MIL-PRF-39012 is a performance specification for coaxial RF connectors \u2014 covering materials, testing, qualification, and quality control for high-reliability applications.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"\" data-listid=\"2\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;multilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">\u2022 Coaxial connectors qualified under MIL-PRF-39012 and dimensioned under MIL-STD-348 support a wide array of high-reliability systems \u2014 from radar, SATCOM, test &amp; measurement equipment to ruggedized field hardware.<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"\" data-listid=\"2\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;multilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">\u2022 Material and plating requirements in MIL-PRF-39012 (e.g., gold-plated centre contacts, specified base materials) ensure consistent electrical performance and durability under harsh conditions.<\/span><a href=\"\/blog\/coax-connectors\/introduction-to-mil-prf-39012-and-mil-std-348-coaxial-connectors\/?utm_source=chatgpt.com\"><span data-contrast=\"auto\">\u00a0<\/span><\/a><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"\" data-listid=\"2\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;multilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">\u2022 Using connectors conforming to these standards enhances system reliability, simplifies sourcing, avoids compatibility issues, and supports long lifecycle and maintainability goals.<\/span><\/li>\n<li><\/li>\n<\/ul>\n<p><strong>MIL-PRF-39012<\/strong><\/p>\n<p>MIL-PRF-39012 can be compared to MIL-DTL-17 for coaxial cables, as they both involve visual, mechanical, and electrical testing in several stages to uphold quality standards. This standard also requires that manufacturing facilities and processes meet quality standards and that the parts covered by the specification can be listed on the Qualified Products List (QPL). Coaxial connectors and adapters that meet MIL-PRF-39012 are well suited to military, and non-military use for a wide range of Hi-Rel applications, including radar, RF instrumentation and test equipment, transceivers, ruggedized RF\/microwave assemblies, SATCOM ground equipment, indoor\/outdoor antennas, transportation, and aerospace RF\/microwave assemblies.<\/p>\n<p>Materials used for MIL-PRF-39012 qualified connectors are specified in referenced industrial standards, listed in the following table.<\/p>\n<table>\n<tbody>\n<tr>\n<td colspan=\"2\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <strong>MIL-PRF-39012F\u00a0 Materials<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>Material<\/strong><\/td>\n<td><strong>Applicable Specifications<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Steel<\/td>\n<td>ASTM A484\/A484M, ASTM A582\/A582M<\/td>\n<\/tr>\n<tr>\n<td>Brass<\/td>\n<td>ASTM B16\/B16M, ASTM B36\/B36M, ASTM B121\/B121M, ASTM B455<\/td>\n<\/tr>\n<tr>\n<td>Phosphor bronze<\/td>\n<td>ASTM B139\/B139M<\/td>\n<\/tr>\n<tr>\n<td>Soft copper<\/td>\n<td>ASTM B152\/B152M<\/td>\n<\/tr>\n<tr>\n<td>Copper<\/td>\n<td>ASTM B88, ASTM B124\/B124M<\/td>\n<\/tr>\n<tr>\n<td>Copper-Beryllium<\/td>\n<td>ASTM B194, ASTM B196\/B196M, ASTM B197\/B197M<\/td>\n<\/tr>\n<tr>\n<td>PTFE fluorocarbon<\/td>\n<td>ASTM D4894, ASTM D4895<\/td>\n<\/tr>\n<tr>\n<td>FEP fluorocarbon<\/td>\n<td>ASTM D2116<\/td>\n<\/tr>\n<tr>\n<td>Silicon rubber<\/td>\n<td>A-A-59588<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>A key aspect of MIL-PRF-39012 connectors is that the center pin for qualified connectors must be gold-plated to a standardized depth, adhesion quality, and finish. The gold plating on the captivated contacts ensures a minimized insertion loss and consistent electrical contact over time and exposure to the environment.<\/p>\n<p>The types of connectors specified in MIL-PRF-39012 include the following:<\/p>\n<p>\u2022 BNC<br \/>\n\u2022 N<br \/>\n\u2022 TNC<br \/>\n\u2022 SMA<br \/>\n\u2022 SMB<br \/>\n\u2022 SMC<br \/>\n\u2022 SMP<br \/>\n\u2022 SSMP<br \/>\n\u2022 SOP<br \/>\n\u2022 OSSP<br \/>\n\u2022 OSMM<br \/>\n\u2022 SSMA<br \/>\n\u2022 SC<br \/>\n\u2022 QMA<br \/>\n\u2022 UMCC<br \/>\n\u2022 SSMT<br \/>\n\u2022 MMCX<\/p>\n<p><strong>MIL-DTL-348<\/strong><\/p>\n<p>MIL-DTL-348 specifies the United States standard interfaces for RF coaxial connectors, which are universally accepted by all US military services. Hence, these connectors are very commonly used in, and outside of military applications, even if the application doesn\u2019t specifically require the use of this standard. The benefit is that MIL-DTL-348 brings interoperability of coaxial connectors, as well as a basis for Hi-Rel design and construction of these components.<\/p>\n<p>MIL-STD-348 includes the RF connectors and adapters referenced in other MIL-SPEC documents:<\/p>\n<p>\u2022 MIL-DTL-3643<br \/>\n\u2022 MIL-DTL-3650<br \/>\n\u2022 MIL-STD-3655<br \/>\n\u2022 MIL-DTL-25516<br \/>\n\u2022 MIL-PRF-31031<br \/>\n\u2022 MIL-PRF-39012<br \/>\n\u2022 MIL-PRF-49142<br \/>\n\u2022 MIL-PRF-55339<br \/>\n\u2022 MIL-DTL-83517<\/p>\n<p aria-level=\"2\"><b><span data-contrast=\"auto\">Recommendations<\/span><\/b><span data-ccp-props=\"{&quot;134245418&quot;:false,&quot;134245529&quot;:false,&quot;335559738&quot;:360,&quot;335559739&quot;:80}\">\u00a0<\/span><\/p>\n<ul>\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"\" data-listid=\"1\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;multilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">\u2022 Always verify both dimensional compliance (MIL-STD-348) and performance qualification (MIL-PRF-39012) before selection<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"\" data-listid=\"1\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;multilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">\u2022 Choose gold-plated contacts for corrosion resistance and low contact resistance.<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"\" data-listid=\"1\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;multilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">\u2022 Match the connector type to the system for frequency and impedance (50 \u03a9 or 75 \u03a9).<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"\" data-listid=\"1\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;multilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">\u2022 Ensure your supplier provides traceable test data or QPL certification for mission-critical use.<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"\" data-listid=\"1\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;multilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">\u2022 For harsh environments, use connectors with high mating cycle ratings and environmental sealing (IP67\/IP68).<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"\" data-listid=\"1\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;multilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">\u2022 For long-term reliability, partner with trusted manufacturers like Pasternack, known for their precision-engineered MIL-compliant RF components.<\/span><\/li>\n<li aria-setsize=\"-1\" data-leveltext=\"\u25cf\" data-font=\"\" data-listid=\"1\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\u25cf&quot;,&quot;469777815&quot;:&quot;multilevel&quot;}\" data-aria-posinset=\"1\" data-aria-level=\"1\"><\/li>\n<li>&nbsp;<\/li>\n<\/ul>\n<p><strong>Resources<\/strong><\/p>\n<ul>\n<li>\n<pre><a href=\"http:\/\/everyspec.com\/MIL-PRF\/MIL-PRF-030000-79999\/MIL-PRF-39012F_AMENDMENT-3_55804\/\">http:\/\/everyspec.com\/MIL-PRF\/MIL-PRF-030000-79999\/MIL-PRF-39012F_AMENDMENT-3_55804\/<\/a><\/pre>\n<\/li>\n<li>\n<pre><a href=\"http:\/\/everyspec.com\/MIL-STD\/MIL-STD-0300-0499\/MIL-STD-348B_CHG-3_55562\/\">http:\/\/everyspec.com\/MIL-STD\/MIL-STD-0300-0499\/MIL-STD-348B_CHG-3_55562\/<\/a><\/pre>\n<\/li>\n<li>\n<pre><a href=\"http:\/\/blog.pasternack.com\/uncategorized\/whats-hype-high-reliability-hi-rel\/\">http:\/\/blog.pasternack.com\/uncategorized\/whats-hype-high-reliability-hi-rel\/<\/a><\/pre>\n<\/li>\n<li>\n<pre><a href=\"https:\/\/www.pasternack.com\/pages\/rf-microwave-and-millimeter-wave-products\/mil-dtl-17-high-reliability-rf-cable-assemblies.html\">https:\/\/www.pasternack.com\/pages\/rf-microwave-and-millimeter-wave-products\/mil-dtl-17-high-reliability-rf-cable-assemblies.html<\/a><\/pre>\n<\/li>\n<\/ul>\n<pre><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>To enable interoperability amongst RF systems, the military and industry rely on standardized dimensions and types of coaxial connectors. The two major standards that define coaxial connectors for the US military are MIL-STD-348 and MIL-PRF-39012. MIL-STD-348 provides the dimensions for control of the standard interfaces, while MIL-PRF-39012 defines the, detail specifications, materials, quality conformance, qualification, ..<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[459],"tags":[425,435,460],"class_list":["post-1151","post","type-post","status-publish","format-standard","hentry","category-coax-connectors","tag-coax-connectors","tag-mil-prf-39012","tag-mil-std-348"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Introduction to MIL-PRF-39012 &amp; MIL-STD-348 Coaxial Connectors | Pasternack<\/title>\n<meta name=\"description\" content=\"Explore how MIL-STD-348 defines RF connector interface dimensions and how MIL-PRF-39012 sets performance and qualification standards for high-reliability coaxial connectors used in military, aerospace, and high-demand RF applications.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"\/blog\/coax-connectors\/introduction-to-mil-prf-39012-and-mil-std-348-coaxial-connectors\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Introduction to MIL-PRF-39012 &amp; MIL-STD-348 Coaxial Connectors | Pasternack\" \/>\n<meta property=\"og:description\" content=\"Explore how MIL-STD-348 defines RF connector interface dimensions and how MIL-PRF-39012 sets performance and qualification standards for high-reliability coaxial connectors used in military, aerospace, and high-demand RF applications.\" \/>\n<meta property=\"og:url\" content=\"\/blog\/coax-connectors\/introduction-to-mil-prf-39012-and-mil-std-348-coaxial-connectors\/\" \/>\n<meta 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