{"id":4294,"date":"2026-07-30T09:18:26","date_gmt":"2026-07-30T09:18:26","guid":{"rendered":"https:\/\/hlconnector.com\/?p=4294"},"modified":"2026-08-17T09:08:41","modified_gmt":"2026-08-17T09:08:41","slug":"one-chart-to-understand-the-four-series-of-mil-dtl-38999-core-differences-and-selection-guide-for-series-i-ii-iii-iv","status":"publish","type":"post","link":"https:\/\/hlconnector.com\/en\/one-chart-to-understand-the-four-series-of-mil-dtl-38999-core-differences-and-selection-guide-for-series-i-ii-iii-iv\/","title":{"rendered":"One Chart to Understand the Four Series of MIL-DTL-38999: Core Differences and Selection Guide for Series I\/II\/III\/IV"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"4294\" class=\"elementor elementor-4294\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6012fd7 e-flex e-con-boxed e-con e-parent\" data-id=\"6012fd7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5f2d8f5 elementor-widget elementor-widget-text-editor\" data-id=\"5f2d8f5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>One Chart to Understand the Four Series of MIL-DTL-38999: Core Differences and Selection Guide for Series I\/II\/III\/IV<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1dcf4ce e-flex e-con-boxed e-con e-parent\" data-id=\"1dcf4ce\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-b769437 e-con-full e-flex e-con e-child\" data-id=\"b769437\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6f864fe elementor-widget elementor-widget-text-editor\" data-id=\"6f864fe\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>The &#8220;Standard Answer&#8221; for Military Connectors<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5602af9 elementor-widget elementor-widget-text-editor\" data-id=\"5602af9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"\">In the world of military circular connectors, MIL-DTL-38999 is a name you cannot avoid. Born in the 1970s as MIL-C-38999, it was developed to meet the trend toward\u00a0<\/span><strong><span class=\"\">&#8220;more signal, less power&#8221;<\/span><\/strong><span class=\"\">\u00a0in military avionics at the time<\/span><span class=\"\">. After decades of evolution, it has become one of the most popular and widely used connector standards in global military aviation, aerospace, and demanding industrial applications<\/span><span class=\"\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-178f688 e-con-full e-flex e-con e-child\" data-id=\"178f688\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d51e1da e-flex e-con-boxed e-con e-parent\" data-id=\"d51e1da\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f963ac1 elementor-widget elementor-widget-text-editor\" data-id=\"f963ac1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"\">The MIL-DTL-38999 standard defines four distinct series:\u00a0<\/span><strong><span class=\"\">Series I, Series II, Series III, and Series IV<\/span><\/strong><span class=\"\">. They share the same core specifications \u2014 environmental resistance, removable crimp contacts, and an operating temperature range of -65\u00b0C to +200\u00b0C<\/span><span class=\"\">\u00a0\u2014 but they are\u00a0<\/span><strong><span class=\"\">not interchangeable or intermateable<\/span><\/strong><span class=\"\">\u00a0with each other<\/span><span class=\"\">.<\/span><\/p><p><span class=\"\">This article uses a clear comparison chart to help you understand the\u00a0<\/span><strong><span class=\"\">coupling mechanism, scoop-proof design, mating cycles, vibration resistance, and application scenarios<\/span><\/strong><span class=\"\">\u00a0of all four series at a glance, and provides practical selection guidance.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-87e4144 e-flex e-con-boxed e-con e-parent\" data-id=\"87e4144\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e5cf6ce elementor-widget elementor-widget-text-editor\" data-id=\"e5cf6ce\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>MIL-DTL-38999 Standard Overview<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-012cdf9 e-flex e-con-boxed e-con e-parent\" data-id=\"012cdf9\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-bd26712 e-con-full e-flex e-con e-child\" data-id=\"bd26712\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6ad961b e-con-full e-flex e-con e-child\" data-id=\"6ad961b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-614830e elementor-widget elementor-widget-text-editor\" data-id=\"614830e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"\">MIL-DTL-38999 (formerly MIL-C-38999) is a military specification that defines\u00a0<\/span><strong><span class=\"\">miniature, high-density, circular connectors<\/span><\/strong><span class=\"\">, available in bayonet and threaded coupling types<\/span><span class=\"\">. It features removable crimp contacts and an operating temperature range of\u00a0<\/span><strong><span class=\"\">-65\u00b0C to +200\u00b0C<\/span><\/strong><span class=\"\">.<\/span><\/p><p><span class=\"\">The standard defines four different connector series<\/span><span class=\"\">. All of them feature\u00a0<\/span><strong><span class=\"\">high contact density<\/span><\/strong><span class=\"\">, supporting up to\u00a0<\/span><strong><span class=\"\">128 contacts<\/span><\/strong><span class=\"\">; are available in\u00a0<\/span><strong><span class=\"\">9 shell sizes<\/span><\/strong><span class=\"\">\u00a0(9 through 25)<\/span><span class=\"\">; and support a wide variety of contact types, including signal, power, coaxial, twinax, quadrax, and fiber optic<\/span><span class=\"\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-08b3a5a e-flex e-con-boxed e-con e-parent\" data-id=\"08b3a5a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6216e87 elementor-widget elementor-widget-text-editor\" data-id=\"6216e87\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"\">The core differences among the four series lie in their\u00a0<\/span><strong><span class=\"\">coupling mechanisms, scoop-proof design, and optimization priorities<\/span><\/strong><span class=\"\">\u00a0\u2014 each is detailed below.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-03d11eb e-flex e-con-boxed e-con e-parent\" data-id=\"03d11eb\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-65b5b83 elementor-widget elementor-widget-text-editor\" data-id=\"65b5b83\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Series I \u2014 The Classic Choice for Bayonet Coupling<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fc76c6f elementor-widget elementor-widget-text-editor\" data-id=\"fc76c6f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Coupling Mechanism: 3-Point Bayonet Coupling<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7757b44 elementor-widget elementor-widget-text-editor\" data-id=\"7757b44\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"\">Series I features\u00a0<\/span><strong><span class=\"\">3-point bayonet coupling<\/span><\/strong><span class=\"\">. Three bayonet pins on the plug mate with three slots on the receptacle, locking with approximately one-third of a turn<\/span><span class=\"\">. Bayonet coupling is characterized by\u00a0<\/span><strong><span class=\"\">quick disconnect<\/span><\/strong><span class=\"\">, making it suitable for blind-mating areas that require frequent mating and unmating<\/span><span class=\"\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0e5a945 e-con-full e-flex e-con e-child\" data-id=\"0e5a945\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-05ba62c elementor-widget elementor-widget-text-editor\" data-id=\"05ba62c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Key Features:<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3f901c1 elementor-widget elementor-widget-text-editor\" data-id=\"3f901c1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">100% Scoop-Proof<\/span><\/strong><span class=\"\">: Pins are recessed within elongated shells, preventing contact damage even if the plug is inserted at an angle<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">High Vibration Resistance<\/span><\/strong><span class=\"\">: Suitable for high-wind and moisture environments<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">5-Key\/Keyway Polarization<\/span><\/strong><span class=\"\">: 5 positioning options eliminate misinsertion risk<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Grounding Fingers<\/span><\/strong><span class=\"\">: Provide standard EMI shielding<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Mating Cycles: 500<\/span><\/strong><\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d9d750a elementor-widget elementor-widget-text-editor\" data-id=\"d9d750a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Typical Applications: Avionics systems, flight-critical electronics, defense and weapon systems, ground support equipment<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c503d55 e-flex e-con-boxed e-con e-parent\" data-id=\"c503d55\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-12af36f elementor-widget elementor-widget-text-editor\" data-id=\"12af36f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Series II \u2014 The Low-Profile Choice for Lightweighting<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-efa5980 elementor-widget elementor-widget-text-editor\" data-id=\"efa5980\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Coupling Mechanism: Low-Profile Bayonet Coupling<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a56036f elementor-widget elementor-widget-text-editor\" data-id=\"a56036f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"\">Series II also uses bayonet coupling, but with a lower profile and lighter weight<\/span><span class=\"\">. To achieve its reduced height and weight, Series II is\u00a0<\/span><strong><span class=\"\">not scoop-proof<\/span><\/strong><span class=\"\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1f4da60 e-con-full e-flex e-con e-child\" data-id=\"1f4da60\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f54eae1 elementor-widget elementor-widget-text-editor\" data-id=\"f54eae1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Key Features:<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dc8daa6 elementor-widget elementor-widget-text-editor\" data-id=\"dc8daa6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Not Scoop-Proof<\/span><\/strong><span class=\"\">: Pins are exposed, requiring careful alignment during blind mating<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Low-Profile Design<\/span><\/strong><span class=\"\">: Reduced shell height saves panel space<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Lightweight<\/span><\/strong><span class=\"\">: Lighter than standard Series I<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Rear-Release Crimp Contacts<\/span><\/strong><span class=\"\">: Removable from the rear for easy maintenance<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Mating Cycles: 250<\/span><\/strong><\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-329b91b elementor-widget elementor-widget-text-editor\" data-id=\"329b91b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Typical Applications: Space- and weight-sensitive applications \u2014 avionics, medical technology, communication equipment<\/span><\/strong><span class=\"\">. Performs well in low-vibration, high-moisture environments<\/span><span class=\"\">.<\/span><\/p><p><strong><span class=\"\">\u00a0Important<\/span><\/strong><span class=\"\">: Due to its lack of scoop-proof protection, Series II is\u00a0<\/span><strong><span class=\"\">not suitable for blind-mating applications<\/span><\/strong><span class=\"\">. For applications requiring blind mating, choose Series I, III, or IV.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-82e1530 e-flex e-con-boxed e-con e-parent\" data-id=\"82e1530\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1bb19d6 elementor-widget elementor-widget-text-editor\" data-id=\"1bb19d6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Series III \u2014 The High-Performance King of Tri-Start Thread<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0b04543 elementor-widget elementor-widget-text-editor\" data-id=\"0b04543\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Coupling Mechanism: Tri-Start ACME Thread<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b422886 elementor-widget elementor-widget-text-editor\" data-id=\"b422886\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"\">Series III is the\u00a0<\/span><strong><span class=\"\">highest-performance series<\/span><\/strong><span class=\"\">\u00a0in the 38999 family, designed for general-purpose and severe-environment applications<\/span><span class=\"\">. It features\u00a0<\/span><strong><span class=\"\">Tri-Start ACME Thread<\/span><\/strong><span class=\"\">\u00a0coupling, locking completely with\u00a0<\/span><strong><span class=\"\">one full turn (360\u00b0)<\/span><\/strong><span class=\"\">\u00a0<\/span><span class=\"\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-84516b6 e-con-full e-flex e-con e-child\" data-id=\"84516b6\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a18ada1 elementor-widget elementor-widget-text-editor\" data-id=\"a18ada1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Key Features:<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a88a71c elementor-widget elementor-widget-text-editor\" data-id=\"a88a71c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><p class=\"ds-markdown-paragraph\"><span class=\"\">\u00a0<\/span><strong><span class=\"\">100% Scoop-Proof<\/span><\/strong><span class=\"\">: Pins are protected<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Self-Locking Thread<\/span><\/strong><span class=\"\">: Coupling nut features an anti-decoupling ratchet \u2014 no lockwire required<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Extremely High Vibration Resistance<\/span><\/strong><span class=\"\">: Suitable for high-temperature, high-moisture, high-wind, and high-vibration environments<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">EMI Shielding \u226565dB @ 10GHz<\/span><\/strong><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Mating Cycles: 500<\/span><\/strong><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Composite Shell Option<\/span><\/strong><span class=\"\">: Up to\u00a0<\/span><strong><span class=\"\">40% lighter<\/span><\/strong><span class=\"\">\u00a0than aluminum,\u00a0<\/span><strong><span class=\"\">4x<\/span><\/strong><span class=\"\">\u00a0better corrosion resistance, and\u00a0<\/span><strong><span class=\"\">1,500<\/span><\/strong><span class=\"\">\u00a0mating cycles<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Fiber Optic Contacts Supported<\/span><\/strong><\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0cc6d0f elementor-widget elementor-widget-text-editor\" data-id=\"0cc6d0f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Typical Applications: Series III is the most commonly used choice in military and aerospace designs<\/span><\/strong><span class=\"\">. Widely used in fighter avionics, missile systems, satellites, engine compartments, and other harsh environments<\/span><span class=\"\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d689165 e-flex e-con-boxed e-con e-parent\" data-id=\"d689165\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8c4b633 elementor-widget elementor-widget-text-editor\" data-id=\"8c4b633\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Series IV \u2014 The Rugged Choice for Breech-Lok Coupling<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a34e211 elementor-widget elementor-widget-text-editor\" data-id=\"a34e211\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Coupling Mechanism: Breech-Lok (Quarter-Turn)<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c111e55 elementor-widget elementor-widget-text-editor\" data-id=\"c111e55\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"\">Series IV features\u00a0<\/span><strong><span class=\"\">Breech-Lok coupling<\/span><\/strong><span class=\"\">, inspired by artillery breech locking mechanisms<\/span><span class=\"\">. After insertion, the plug locks with\u00a0<\/span><strong><span class=\"\">a quarter-turn (approximately 90\u00b0)<\/span><\/strong><span class=\"\">\u00a0<\/span><span class=\"\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-90b47d0 e-con-full e-flex e-con e-child\" data-id=\"90b47d0\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-07217d2 elementor-widget elementor-widget-text-editor\" data-id=\"07217d2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Key Features:<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f98f729 elementor-widget elementor-widget-text-editor\" data-id=\"f98f729\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">100% Scoop-Proof<\/span><\/strong><span class=\"\">: Pins are protected<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Visual + Tactile + Audible Triple Mating Confirmation<\/span><\/strong><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Primary + Secondary Dual Locking Mechanism<\/span><\/strong><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Extremely High Vibration Resistance<\/span><\/strong><span class=\"\">: Outperforms threaded connectors in high-vibration environments<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Lightweight Design<\/span><\/strong><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Suitable for Blind-Mating Applications<\/span><\/strong><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Mating Cycles: 500<\/span><\/strong><\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8c66a4d elementor-widget elementor-widget-text-editor\" data-id=\"8c66a4d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Typical Applications: Rack and panel equipment, missile systems, aerospace<\/span><\/strong><span class=\"\">. Suitable for applications requiring\u00a0<\/span><strong><span class=\"\">robust locking and extreme vibration resistance<\/span><\/strong><span class=\"\">. Particularly well-suited for Line Replaceable Units (LRUs) requiring quick disconnect<\/span><span class=\"\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-18dc96c e-flex e-con-boxed e-con e-parent\" data-id=\"18dc96c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bb80db8 elementor-widget elementor-widget-text-editor\" data-id=\"bb80db8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Core Parameter Comparison Table of the Four Series<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5a3a7a9 elementor-widget elementor-widget-image\" data-id=\"5a3a7a9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" data-src=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162.png\" data-srcset=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162.png 1540w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162-300x103.png 300w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162-1024x352.png 1024w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162-768x264.png 768w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162-1536x529.png 1536w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162-18x6.png 18w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162-600x206.png 600w\" width=\"1540\" height=\"530\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" class=\"attachment-full size-full wp-image-4296 lazyload\" alt=\"\"  sizes=\"(max-width: 1540px) 100vw, 1540px\" \/><noscript><img decoding=\"async\" width=\"1540\" height=\"530\" src=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162.png\" class=\"attachment-full size-full wp-image-4296\" alt=\"\" srcset=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162.png 1540w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162-300x103.png 300w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162-1024x352.png 1024w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162-768x264.png 768w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162-1536x529.png 1536w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162-18x6.png 18w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/07\/cee454b32028f8c0aba83f4e56329162-600x206.png 600w\" sizes=\"(max-width: 1540px) 100vw, 1540px\"><\/noscript>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f5d7279 elementor-widget elementor-widget-text-editor\" data-id=\"f5d7279\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Selection Guide \u2014 Four Questions to Lock In the Right Answer<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c39db54 elementor-widget elementor-widget-text-editor\" data-id=\"c39db54\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Q1: Is blind mating required?<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6610e1a e-con-full e-flex e-con e-child\" data-id=\"6610e1a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e059a76 elementor-widget elementor-widget-text-editor\" data-id=\"e059a76\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><span class=\"\">Yes (rack backplanes, dark environments, areas difficult to visually align) \u2192\u00a0<\/span><strong><span class=\"\">Exclude Series II<\/span><\/strong><span class=\"\">. Choose Series I, III, or IV.<\/span><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e7cf167 e-con-full e-flex e-con e-child\" data-id=\"e7cf167\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b747bc4 elementor-widget elementor-widget-text-editor\" data-id=\"b747bc4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li>No (visually alignable) \u2192 Series II is an option<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d55db1b elementor-widget elementor-widget-text-editor\" data-id=\"d55db1b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Q2: Is the application in a high-vibration environment?<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2c9bb26 e-con-full e-flex e-con e-child\" data-id=\"2c9bb26\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cd9f6fe elementor-widget elementor-widget-text-editor\" data-id=\"cd9f6fe\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><span class=\"\">Yes (fighters, helicopters, missiles, engine compartments) \u2192\u00a0<\/span><strong><span class=\"\">Series III (preferred) or Series IV<\/span><\/strong><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b5efe3e e-con-full e-flex e-con e-child\" data-id=\"b5efe3e\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a25e031 elementor-widget elementor-widget-text-editor\" data-id=\"a25e031\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li>No \u2192 Move to next question<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-38561b6 elementor-widget elementor-widget-text-editor\" data-id=\"38561b6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Q3: Are space and weight extremely limited?<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c387f87 e-con-full e-flex e-con e-child\" data-id=\"c387f87\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-534b9ef elementor-widget elementor-widget-text-editor\" data-id=\"534b9ef\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><span class=\"\">Yes \u2192\u00a0<\/span><strong><span class=\"\">Series II (low-profile, lightweight) or Series III (composite shell option)<\/span><\/strong><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-155ff12 e-con-full e-flex e-con e-child\" data-id=\"155ff12\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b6c4188 elementor-widget elementor-widget-text-editor\" data-id=\"b6c4188\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li>No \u2192 Move to next question<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-263e836 elementor-widget elementor-widget-text-editor\" data-id=\"263e836\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Q4: Is the highest level of EMI shielding required?<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-df3e02c e-con-full e-flex e-con e-child\" data-id=\"df3e02c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8333945 elementor-widget elementor-widget-text-editor\" data-id=\"8333945\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><span class=\"\">Yes (radar, communication front-ends, sensitive electronics) \u2192\u00a0<\/span><strong><span class=\"\">Series III<\/span><\/strong><span class=\"\">\u00a0(\u226565dB @ 10GHz)<\/span><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-84eca79 e-con-full e-flex e-con e-child\" data-id=\"84eca79\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cd3b227 elementor-widget elementor-widget-text-editor\" data-id=\"cd3b227\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li>No \u2192 Series I or Series IV are both acceptable<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-adc659b elementor-widget elementor-widget-text-editor\" data-id=\"adc659b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">Final Recommendation:<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dffd840 elementor-widget elementor-widget-text-editor\" data-id=\"dffd840\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">When there are no special restrictions, choose Series III <\/span><\/strong><span class=\"\">\u00a0\u2014 it is the most comprehensive and widely used series in the 38999 family<\/span><span class=\"\">.<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">If\u00a0<\/span><strong><span class=\"\">space and weight are the primary constraints<\/span><\/strong><span class=\"\">\u00a0and blind mating is not required \u2192 Series II<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><span class=\"\">If\u00a0<\/span><strong><span class=\"\">extremely quick mating and robust locking<\/span><\/strong><span class=\"\">\u00a0are required (e.g., battlefield LRUs) \u2192 Series IV<\/span><\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4cfb2f1 e-flex e-con-boxed e-con e-parent\" data-id=\"4cfb2f1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-3d0bb1b e-con-full e-flex e-con e-child\" data-id=\"3d0bb1b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-02941d9 elementor-widget elementor-widget-text-editor\" data-id=\"02941d9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Four Series, Configured to Your Needs<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-eb26619 elementor-widget elementor-widget-text-editor\" data-id=\"eb26619\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span class=\"\">Every one of the four series described above \u2014 our product line\u00a0<\/span><strong><span class=\"\">covers all of them<\/span><\/strong><span class=\"\">,\u00a0<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3231368 elementor-widget elementor-widget-text-editor\" data-id=\"3231368\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><strong><span class=\"\">Full coverage of all four series<\/span><\/strong><span class=\"\">\u00a0\u2013 Series I (Bayonet) \/ II (Low Profile) \/ III (Tri-Start Thread) \/ IV (Breech-Lok)<\/span><\/li><li><strong><span class=\"\">Scoop-Proof Design<\/span><\/strong><span class=\"\">\u00a0\u2013 Series I\/III\/IV 100% scoop-proof, blind-mating assured<\/span><\/li><li><strong><span class=\"\">Shell sizes 9\u201325 | Up to 128 contacts<\/span><\/strong><span class=\"\">\u00a0\u2013 High-density configurations, full coverage<\/span><\/li><li><strong><span class=\"\">Multiple contact options<\/span><\/strong><span class=\"\">\u00a0\u2013 Signal\/Power\/Coaxial\/Twinax\/Quadrax\/Fiber Optic, configurable<\/span><\/li><li><strong><span class=\"\">Operating temperature -65\u00b0C to +200\u00b0C<\/span><\/strong><span class=\"\">\u00a0\u2013 From extreme cold to high heat, full coverage<\/span><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-fa8d9dd e-con-full e-flex e-con e-child\" data-id=\"fa8d9dd\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-83626ed elementor-widget elementor-widget-image\" data-id=\"83626ed\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" data-src=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4.jpg\" data-srcset=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4.jpg 1184w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4-300x119.jpg 300w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4-1024x406.jpg 1024w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4-768x304.jpg 768w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4-18x7.jpg 18w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4-600x238.jpg 600w\" width=\"1184\" height=\"469\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" class=\"attachment-full size-full wp-image-4025 lazyload\" alt=\"\"  sizes=\"(max-width: 1184px) 100vw, 1184px\" \/><noscript><img loading=\"lazy\" decoding=\"async\" width=\"1184\" height=\"469\" src=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4.jpg\" class=\"attachment-full size-full wp-image-4025\" alt=\"\" srcset=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4.jpg 1184w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4-300x119.jpg 300w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4-1024x406.jpg 1024w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4-768x304.jpg 768w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4-18x7.jpg 18w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/99-4-600x238.jpg 600w\" sizes=\"(max-width: 1184px) 100vw, 1184px\"><\/noscript>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b015ea1 elementor-widget elementor-widget-text-editor\" data-id=\"b015ea1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong><span class=\"\">We deliver not just connectors \u2014 but a one-stop solution of &#8220;four-series precision matching + European compliance&#8221;<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-82ca480 elementor-widget elementor-widget-button\" data-id=\"82ca480\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/hlconnector.com\/en\/contact\/\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Submit Your Requirements<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e6cd372 e-flex e-con-boxed e-con e-parent\" data-id=\"e6cd372\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-caf8f9b elementor-widget elementor-widget-spacer\" data-id=\"caf8f9b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-eb371f0 e-flex e-con-boxed e-con e-parent\" data-id=\"eb371f0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6b46066 elementor-widget elementor-widget-text-editor\" data-id=\"6b46066\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Recent Posta<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d1dfb96 elementor-grid-3 elementor-grid-tablet-2 elementor-grid-mobile-1 elementor-posts--thumbnail-top elementor-widget elementor-widget-posts\" data-id=\"d1dfb96\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;classic_columns&quot;:&quot;3&quot;,&quot;classic_columns_tablet&quot;:&quot;2&quot;,&quot;classic_columns_mobile&quot;:&quot;1&quot;,&quot;classic_row_gap&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:35,&quot;sizes&quot;:[]},&quot;classic_row_gap_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;classic_row_gap_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"posts.classic\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-posts-container elementor-posts elementor-posts--skin-classic elementor-grid\" role=\"list\">\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-4424 post type-post status-publish format-standard has-post-thumbnail hentry category-mil-dtl-38999-connector category-uncategorized entry has-media owp-thumbs-layout-horizontal owp-btn-normal owp-tabs-layout-horizontal has-no-thumbnails has-product-nav\" role=\"listitem\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/hlconnector.com\/en\/coaxial-contact-vs-quadrax-contact-how-to-choose-the-high-speed-data-transmission-solution-for-38999\/\" tabindex=\"-1\" >\n\t\t\t<div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" data-src=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/\u56fe\u7247\u751f\u6210\u5206\u6790-1-300x108.png\" width=\"300\" height=\"108\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" class=\"attachment-medium size-medium wp-image-4431 lazyload\" alt=\"\" \/><noscript><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"108\" src=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/\u56fe\u7247\u751f\u6210\u5206\u6790-1-300x108.png\" class=\"attachment-medium size-medium wp-image-4431\" alt=\"\" srcset=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/\u56fe\u7247\u751f\u6210\u5206\u6790-1-300x108.png 300w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/\u56fe\u7247\u751f\u6210\u5206\u6790-1-1024x369.png 1024w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/\u56fe\u7247\u751f\u6210\u5206\u6790-1-768x276.png 768w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/\u56fe\u7247\u751f\u6210\u5206\u6790-1-1536x553.png 1536w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/\u56fe\u7247\u751f\u6210\u5206\u6790-1-18x6.png 18w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/\u56fe\u7247\u751f\u6210\u5206\u6790-1-600x216.png 600w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/\u56fe\u7247\u751f\u6210\u5206\u6790-1.png 1920w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/noscript><\/div>\n\t\t<\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/hlconnector.com\/en\/coaxial-contact-vs-quadrax-contact-how-to-choose-the-high-speed-data-transmission-solution-for-38999\/\" >\n\t\t\t\tCoaxial Contact vs Quadrax Contact: How to Choose the High-Speed Data Transmission Solution for 38999?\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tSeptember 4, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>Coaxial Contact vs Quadrax Contact: How to Choose the High-Speed<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/hlconnector.com\/en\/coaxial-contact-vs-quadrax-contact-how-to-choose-the-high-speed-data-transmission-solution-for-38999\/\" aria-label=\"Read more about Coaxial Contact vs Quadrax Contact: How to Choose the High-Speed Data Transmission Solution for 38999?\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-4407 post type-post status-publish format-standard has-post-thumbnail hentry category-mil-dtl-38999-connector category-uncategorized entry has-media owp-thumbs-layout-horizontal owp-btn-normal owp-tabs-layout-horizontal has-no-thumbnails has-product-nav\" role=\"listitem\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/hlconnector.com\/en\/mil-dtl-38999-four-series-core-differences-and-selection-guide-for-series-i-ii-iii-iv\/\" tabindex=\"-1\" >\n\t\t\t<div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" data-src=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/66-1-300x151.jpg\" width=\"300\" height=\"151\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" class=\"attachment-medium size-medium wp-image-4004 lazyload\" alt=\"\" \/><noscript><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"151\" src=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/66-1-300x151.jpg\" class=\"attachment-medium size-medium wp-image-4004\" alt=\"\" srcset=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/66-1-300x151.jpg 300w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/66-1-1024x517.jpg 1024w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/66-1-768x388.jpg 768w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/66-1-1536x775.jpg 1536w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/66-1-2048x1034.jpg 2048w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/66-1-18x9.jpg 18w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/66-1-600x303.jpg 600w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/noscript><\/div>\n\t\t<\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/hlconnector.com\/en\/mil-dtl-38999-four-series-core-differences-and-selection-guide-for-series-i-ii-iii-iv\/\" >\n\t\t\t\tMIL-DTL-38999 Four Series: Core Differences and Selection Guide for Series I\/II\/III\/IV\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tSeptember 2, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>MIL-DTL-38999 Four Series: Core Differences and Selection Guide for Series<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/hlconnector.com\/en\/mil-dtl-38999-four-series-core-differences-and-selection-guide-for-series-i-ii-iii-iv\/\" aria-label=\"Read more about MIL-DTL-38999 Four Series: Core Differences and Selection Guide for Series I\/II\/III\/IV\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-4397 post type-post status-publish format-standard has-post-thumbnail hentry category-mil-c-83513-connector category-uncategorized entry has-media owp-thumbs-layout-horizontal owp-btn-normal owp-tabs-layout-horizontal has-no-thumbnails has-product-nav\" role=\"listitem\">\n\t\t\t\t<a class=\"elementor-post__thumbnail__link\" href=\"https:\/\/hlconnector.com\/en\/500-mating-cycles-55c-to-125c-interpreting-the-performance-parameters-of-mil-c-83513\/\" tabindex=\"-1\" >\n\t\t\t<div class=\"elementor-post__thumbnail\"><img loading=\"lazy\" decoding=\"async\" data-src=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/\u56fe\u7247\u53d8\u6e05\u6670-9-300x200.png\" width=\"300\" height=\"200\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" class=\"attachment-medium size-medium wp-image-3884 lazyload\" alt=\"\" \/><noscript><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"200\" src=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/\u56fe\u7247\u53d8\u6e05\u6670-9-300x200.png\" class=\"attachment-medium size-medium wp-image-3884\" alt=\"\" srcset=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/\u56fe\u7247\u53d8\u6e05\u6670-9-300x200.png 300w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/\u56fe\u7247\u53d8\u6e05\u6670-9-1024x683.png 1024w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/\u56fe\u7247\u53d8\u6e05\u6670-9-768x512.png 768w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/\u56fe\u7247\u53d8\u6e05\u6670-9-1536x1024.png 1536w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/\u56fe\u7247\u53d8\u6e05\u6670-9-2048x1365.png 2048w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/\u56fe\u7247\u53d8\u6e05\u6670-9-18x12.png 18w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/05\/\u56fe\u7247\u53d8\u6e05\u6670-9-600x400.png 600w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/noscript><\/div>\n\t\t<\/a>\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/hlconnector.com\/en\/500-mating-cycles-55c-to-125c-interpreting-the-performance-parameters-of-mil-c-83513\/\" >\n\t\t\t\t500 Mating Cycles, -55\u00b0C to +125\u00b0C: Interpreting the Performance Parameters of MIL-C-83513\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__meta-data\">\n\t\t\t\t\t<span class=\"elementor-post-date\">\n\t\t\tAugust 31, 2026\t\t<\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>500 Mating Cycles, -55\u00b0C to +125\u00b0C: Interpreting the Performance Parameters<\/p>\n\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/hlconnector.com\/en\/500-mating-cycles-55c-to-125c-interpreting-the-performance-parameters-of-mil-c-83513\/\" aria-label=\"Read more about 500 Mating Cycles, -55\u00b0C to +125\u00b0C: Interpreting the Performance Parameters of MIL-C-83513\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<\/div>\n\t\t\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>One Chart to Understand the Four Series of MIL-DTL-38999: Core Differences and Selection Guide for Series I\/II\/III\/IV The &#8220;Standard Answer&#8221; for Military Connectors In the world of military circular connectors, MIL-DTL-38999 is a name you cannot avoid. Born in the 1970s as MIL-C-38999, it was developed to meet the trend toward\u00a0&#8220;more signal, less power&#8221;\u00a0in military 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