{"id":4407,"date":"2026-09-02T07:13:31","date_gmt":"2026-09-02T07:13:31","guid":{"rendered":"https:\/\/hlconnector.com\/?p=4407"},"modified":"2026-09-02T09:07:31","modified_gmt":"2026-09-02T09:07:31","slug":"mil-dtl-38999-four-series-core-differences-and-selection-guide-for-series-i-ii-iii-iv","status":"publish","type":"post","link":"https:\/\/hlconnector.com\/en\/mil-dtl-38999-four-series-core-differences-and-selection-guide-for-series-i-ii-iii-iv\/","title":{"rendered":"MIL-DTL-38999 Four Series: Core Differences and Selection Guide for Series I\/II\/III\/IV"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"4407\" class=\"elementor elementor-4407\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6598354 e-flex e-con-boxed e-con e-parent\" data-id=\"6598354\" 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-db8d83b elementor-widget elementor-widget-text-editor\" data-id=\"db8d83b\" 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 Four Series: 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<div class=\"elementor-element elementor-element-478a57d elementor-align-center elementor-widget elementor-widget-button\" data-id=\"478a57d\" 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\/mil-dtl-38999-connector\/\">\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\">Our Products<\/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\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f3736ba e-flex e-con-boxed e-con e-parent\" data-id=\"f3736ba\" 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-9117128 elementor-widget elementor-widget-text-editor\" data-id=\"9117128\" 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 Circular Connectors<\/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-1aeafe0 e-flex e-con-boxed e-con e-parent\" data-id=\"1aeafe0\" 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-f2dab99 e-con-full e-flex e-con e-child\" data-id=\"f2dab99\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-28bd0d5 elementor-widget elementor-widget-text-editor\" data-id=\"28bd0d5\" 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 &#8220;more signal, less power&#8221; in 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 environments<\/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-d5aa01c e-con-full e-flex e-con e-child\" data-id=\"d5aa01c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5413e84 elementor-widget elementor-widget-text-editor\" data-id=\"5413e84\" 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. This article uses clear comparisons to help you understand the core differences of 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<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b63f13b e-flex e-con-boxed e-con e-parent\" data-id=\"b63f13b\" 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-b1f4dea e-con-full e-flex e-con e-child\" data-id=\"b1f4dea\" 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-3a28f82 e-flex e-con-boxed e-con e-parent\" data-id=\"3a28f82\" 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-1cf4555 elementor-widget elementor-widget-text-editor\" data-id=\"1cf4555\" 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<div class=\"elementor-element elementor-element-c2c03eb elementor-widget elementor-widget-text-editor\" data-id=\"c2c03eb\" 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=\"\">. Originally issued in the 1970s, it remains widely used today<\/span><span class=\"\">. It features removable crimp contacts<\/span><span class=\"\">\u00a0and 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=\"\">, are available in\u00a0<\/span><strong><span class=\"\">9 shell sizes<\/span><\/strong><span class=\"\">\u00a0(09 through 25)<\/span><span class=\"\">, and support a wide variety of contact types, including signal, power, coaxial, twinax, and fiber optic<\/span><span class=\"\">. The core differences among the four series lie in their\u00a0<\/span><strong><span class=\"\">coupling mechanisms, scoop-proof design, mating cycles, and optimization priorities<\/span><\/strong><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-6be414a e-flex e-con-boxed e-con e-parent\" data-id=\"6be414a\" 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-a760c80 elementor-widget elementor-widget-text-editor\" data-id=\"a760c80\" 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-25e1224 elementor-widget elementor-widget-text-editor\" data-id=\"25e1224\" 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: 3-Point Bayonet Coupling<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-97f8648 elementor-widget elementor-widget-text-editor\" data-id=\"97f8648\" 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\u00a0<\/span><strong><span class=\"\">120\u00b0 (one-third of a turn)<\/span><\/strong><span class=\"\">\u00a0<\/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 fast 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-2da0b0c e-con-full e-flex e-con e-child\" data-id=\"2da0b0c\" 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-84a0f73 elementor-widget elementor-widget-text-editor\" data-id=\"84a0f73\" 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>Key Features:<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-367d6eb elementor-widget elementor-widget-text-editor\" data-id=\"367d6eb\" 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=\"\">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><\/li><li><strong><span class=\"\">High Vibration Resistance<\/span><\/strong><span class=\"\">: Suitable for high-wind and moisture environments<\/span><\/li><li><strong><span class=\"\">Five-Key\/Keyway Polarization<\/span><\/strong><span class=\"\">: 5 positioning options eliminate misinsertion risk<\/span><\/li><li><strong><span class=\"\">Grounding Fingers<\/span><\/strong><span class=\"\">: Provide EMI shielding<\/span><\/li><li><strong><span class=\"\">Mating Cycles: 500<\/span><\/strong><\/li><li><strong><span class=\"\">Bend Moment: 650 lbs in<\/span><\/strong><\/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-27b8849 elementor-widget elementor-widget-text-editor\" data-id=\"27b8849\" 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<\/span><\/strong><span class=\"\">: Avionics systems, flight-critical electronics, defense and weapon systems, ground support equipment<\/span><span class=\"\">. Series I is commonly used where a quick disconnect coupling system is required for blind mating or other mating-difficult areas<\/span><span class=\"\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-895a026 elementor-widget elementor-widget-text-editor\" data-id=\"895a026\" 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-96991bf elementor-widget elementor-widget-text-editor\" data-id=\"96991bf\" 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-95dbad7 elementor-widget elementor-widget-text-editor\" data-id=\"95dbad7\" 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-24d6ed7 e-con-full e-flex e-con e-child\" data-id=\"24d6ed7\" 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-6a8a498 elementor-widget elementor-widget-text-editor\" data-id=\"6a8a498\" 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>Key Features:<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c3bb19c elementor-widget elementor-widget-text-editor\" data-id=\"c3bb19c\" 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=\"\">Not Scoop-Proof<\/span><\/strong><span class=\"\">: Pins are exposed, requiring careful alignment during blind mating<\/span><\/li><li><strong><span class=\"\">Low-Profile Design<\/span><\/strong><span class=\"\">: Reduced shell height saves panel space<\/span><\/li><li><strong><span class=\"\">Lightweight<\/span><\/strong><span class=\"\">: Lighter than standard Series I<\/span><\/li><li><strong><span class=\"\">Mating Cycles: 250<\/span><\/strong><\/li><li><strong><span class=\"\">Bend Moment: 150 lbs in<\/span><\/strong><\/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-20282c4 elementor-widget elementor-widget-text-editor\" data-id=\"20282c4\" 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=\"\">Important<\/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><p><strong><span class=\"\">Typical Applications<\/span><\/strong><span class=\"\">: Space- and weight-sensitive applications \u2014 avionics, medical technology, communication equipment<\/span><span class=\"\">. Series II is suitable where the connector is not subjected to high vibration or moisture, and where space or weight is at a premium due to its lower profile<\/span><span class=\"\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d541882 elementor-widget elementor-widget-text-editor\" data-id=\"d541882\" 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-bfb0d28 elementor-widget elementor-widget-text-editor\" data-id=\"bfb0d28\" 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-3784b83 elementor-widget elementor-widget-text-editor\" data-id=\"3784b83\" 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-9809568 e-con-full e-flex e-con e-child\" data-id=\"9809568\" 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-e0f8ca2 elementor-widget elementor-widget-text-editor\" data-id=\"e0f8ca2\" 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>Key Features:<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-83db703 elementor-widget elementor-widget-text-editor\" data-id=\"83db703\" 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=\"\">100% Scoop-Proof<\/span><\/strong><span class=\"\">: Pins are protected<\/span><\/li><li><strong><span class=\"\">Self-Locking Thread<\/span><\/strong><span class=\"\">: Coupling nut features an anti-decoupling mechanism \u2014 no lockwire required<\/span><\/li><li><strong><span class=\"\">Extremely High Vibration Resistance<\/span><\/strong><span class=\"\">: Suitable for high-temperature, high-moisture, high-wind, and high-vibration environments<\/span><\/li><li><strong><span class=\"\">EMI Shielding<\/span><\/strong><span class=\"\">: Minimum 40dB at 10GHz<\/span><\/li><li><strong><span class=\"\">Mating Cycles: 500<\/span><\/strong><\/li><li><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><\/li><li><strong><span class=\"\">Fiber Optic Contacts Supported<\/span><\/strong><\/li><li><strong><span class=\"\">Bend Moment: 1000 lbs in<\/span><\/strong><\/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-d8a5227 elementor-widget elementor-widget-text-editor\" data-id=\"d8a5227\" 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<\/span><\/strong><span class=\"\">: Series III is the\u00a0<\/span><strong><span class=\"\">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<div class=\"elementor-element elementor-element-f988e77 elementor-widget elementor-widget-text-editor\" data-id=\"f988e77\" 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-8a107f9 elementor-widget elementor-widget-text-editor\" data-id=\"8a107f9\" 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: Breech-Lok (Quarter-Turn)<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-256bac3 elementor-widget elementor-widget-text-editor\" data-id=\"256bac3\" 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. 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-53cac59 e-con-full e-flex e-con e-child\" data-id=\"53cac59\" 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-4a3ddab elementor-widget elementor-widget-text-editor\" data-id=\"4a3ddab\" 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>Key Features:<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a83624f elementor-widget elementor-widget-text-editor\" data-id=\"a83624f\" 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=\"\">100% Scoop-Proof<\/span><\/strong><span class=\"\">: Pins are protected<\/span><\/li><li><strong><span class=\"\">Extremely High Vibration Resistance<\/span><\/strong><span class=\"\">: Performs excellently in shock and vibration environments<\/span><\/li><li><strong><span class=\"\">Lightweight Design<\/span><\/strong><\/li><li><strong><span class=\"\">Suitable for Blind-Mating Applications<\/span><\/strong><\/li><li><strong><span class=\"\">Mating Cycles: 500<\/span><\/strong><\/li><li><strong><span class=\"\">Bend Moment: 1000 lbs in<\/span><\/strong><\/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-cd09e33 elementor-widget elementor-widget-text-editor\" data-id=\"cd09e33\" 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<\/span><\/strong><span class=\"\">: Rack and panel equipment, missile systems, aerospace<\/span><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><\/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-e885c44 e-flex e-con-boxed e-con e-parent\" data-id=\"e885c44\" 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-dd97621 elementor-widget elementor-widget-text-editor\" data-id=\"dd97621\" 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-4be842f elementor-widget elementor-widget-image\" data-id=\"4be842f\" 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\/09\/a045de1d5c23391d205b222449b88fa9.png\" data-srcset=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/a045de1d5c23391d205b222449b88fa9.png 1534w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/a045de1d5c23391d205b222449b88fa9-300x113.png 300w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/a045de1d5c23391d205b222449b88fa9-1024x387.png 1024w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/a045de1d5c23391d205b222449b88fa9-768x290.png 768w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/a045de1d5c23391d205b222449b88fa9-18x7.png 18w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/a045de1d5c23391d205b222449b88fa9-600x226.png 600w\" width=\"1534\" height=\"579\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" class=\"attachment-full size-full wp-image-4413 lazyload\" alt=\"\"  sizes=\"(max-width: 1534px) 100vw, 1534px\" \/><noscript><img decoding=\"async\" width=\"1534\" height=\"579\" src=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/a045de1d5c23391d205b222449b88fa9.png\" class=\"attachment-full size-full wp-image-4413\" alt=\"\" srcset=\"https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/a045de1d5c23391d205b222449b88fa9.png 1534w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/a045de1d5c23391d205b222449b88fa9-300x113.png 300w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/a045de1d5c23391d205b222449b88fa9-1024x387.png 1024w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/a045de1d5c23391d205b222449b88fa9-768x290.png 768w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/a045de1d5c23391d205b222449b88fa9-18x7.png 18w, https:\/\/hlconnector.com\/wp-content\/uploads\/2026\/09\/a045de1d5c23391d205b222449b88fa9-600x226.png 600w\" sizes=\"(max-width: 1534px) 100vw, 1534px\"><\/noscript>\t\t\t\t\t\t\t\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-cc16a14 e-flex e-con-boxed e-con e-parent\" data-id=\"cc16a14\" 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-dfe28b1 elementor-widget elementor-widget-text-editor\" data-id=\"dfe28b1\" 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 Help You 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-6838533 elementor-widget elementor-widget-text-editor\" data-id=\"6838533\" 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>Q1: Is blind mating required?<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ed073f3 e-con-full e-flex e-con e-child\" data-id=\"ed073f3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-030dbbe elementor-widget elementor-widget-text-editor\" data-id=\"030dbbe\" 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>\u2714\u00a0<\/strong> <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><span class=\"\">.<\/span><\/p><p><strong>\u2716<\/strong>\u00a0 No (visually alignable) \u2192 Series II is an option<\/p>\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-4b5872d elementor-widget elementor-widget-text-editor\" data-id=\"4b5872d\" 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-763ee2c e-con-full e-flex e-con e-child\" data-id=\"763ee2c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-76cf4a8 elementor-widget elementor-widget-text-editor\" data-id=\"76cf4a8\" 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>\u2714\u00a0<\/strong> <span class=\"\">Yes (fighters, helicopters, missiles, engine compartments) \u2192\u00a0<\/span><strong><span class=\"\">Series III (preferred) or Series IV<\/span><\/strong><\/p><p><strong>\u2716<\/strong>\u00a0 No \u2192 Move to next question<\/p>\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-dea1607 elementor-widget elementor-widget-text-editor\" data-id=\"dea1607\" 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-c46a81c e-con-full e-flex e-con e-child\" data-id=\"c46a81c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6aca097 elementor-widget elementor-widget-text-editor\" data-id=\"6aca097\" 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>\u2714\u00a0<\/strong> <span class=\"\">Yes \u2192\u00a0<\/span><strong><span class=\"\">Series II (low-profile, lightweight)<\/span><\/strong><span class=\"\">\u00a0<\/span><span class=\"\">or Series III (composite shell option)<\/span><\/p><p><strong>\u2716\u00a0<\/strong> No \u2192 Move to next question<\/p>\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-19a6ae9 elementor-widget elementor-widget-text-editor\" data-id=\"19a6ae9\" 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 vibration and shock protection required?<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4144ac8 e-con-full e-flex e-con e-child\" data-id=\"4144ac8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f7fa18f elementor-widget elementor-widget-text-editor\" data-id=\"f7fa18f\" 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>\u2714\u00a0<\/strong> <span class=\"\">Yes (missile launch, extreme battlefield environments) \u2192\u00a0<\/span><strong><span class=\"\">Series IV<\/span><\/strong><span class=\"\">\u00a0(Breech-Lok, excellent vibration resistance)<\/span><\/p><p><strong>\u2716\u00a0<\/strong> No \u2192 Series I or Series III are both acceptable<\/p>\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-368033b elementor-widget elementor-widget-text-editor\" data-id=\"368033b\" 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<div class=\"elementor-element elementor-element-1bebe06 e-con-full e-flex e-con e-child\" data-id=\"1bebe06\" 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-9176460 elementor-widget elementor-widget-text-editor\" data-id=\"9176460\" 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>Key Features:<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3f7f876 elementor-widget elementor-widget-text-editor\" data-id=\"3f7f876\" 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 first<\/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<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0ff1db9 e-flex e-con-boxed e-con e-parent\" data-id=\"0ff1db9\" 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-61a87e3 elementor-widget elementor-widget-text-editor\" data-id=\"61a87e3\" 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 four series of MIL-DTL-38999 each have their own irreplaceable value proposition:<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5a37511 elementor-widget elementor-widget-text-editor\" data-id=\"5a37511\" 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=\"\">Series I<\/span><\/strong><span class=\"\">: The classic choice for bayonet coupling \u2014 reliable, fast, scoop-proof<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Series II<\/span><\/strong><span class=\"\">: The low-profile choice for lightweighting \u2014 saves space and weight, but sacrifices scoop-proof protection<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Series III<\/span><\/strong><span class=\"\">: The high-performance king of tri-start thread \u2014 the most comprehensive performance, the default choice for military aviation<\/span><\/p><\/li><li><p class=\"ds-markdown-paragraph\"><strong><span class=\"\">Series IV<\/span><\/strong><span class=\"\">: The rugged choice for breech-lok \u2014 ultra-fast locking, extreme vibration resistance<\/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-924e6c1 e-flex e-con-boxed e-con e-parent\" data-id=\"924e6c1\" 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-d9fdfa9 e-con-full e-flex e-con e-child\" data-id=\"d9fdfa9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8d079e2 elementor-widget elementor-widget-text-editor\" data-id=\"8d079e2\" 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=\"\">Master the core differences of the four series, and you can quickly lock onto the one matching model from dozens of MIL-DTL-38999 configurations. Remember:\u00a0<\/span><strong><span class=\"\">Series III is the safest all-around choice<\/span><\/strong><span class=\"\">, but in specific scenarios, other series may be the better solution.<\/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-4e42d90 e-con-full e-flex e-con e-child\" data-id=\"4e42d90\" 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-0cb1729 e-flex e-con-boxed e-con e-parent\" data-id=\"0cb1729\" 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-9cf841b elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"9cf841b\" 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<div class=\"elementor-element elementor-element-5da39fd e-con-full e-flex e-con e-child\" data-id=\"5da39fd\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-9cf8916 e-con-full e-flex e-con e-child\" data-id=\"9cf8916\" 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-6f803f7 elementor-widget elementor-widget-text-editor\" data-id=\"6f803f7\" 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=\"\">Series III Tri-Start Thread<\/span><\/strong><span class=\"\">\u00a0\u2013 One-turn locking, self-locking anti-loosening, EMI shielding \u226540dB @ 10GHz<\/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 09\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\/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-844a338 e-con-full e-flex e-con e-child\" data-id=\"844a338\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-8bb4689 e-con-full e-flex e-con e-child\" data-id=\"8bb4689\" 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<div class=\"elementor-element elementor-element-3988dc0 elementor-widget elementor-widget-text-editor\" data-id=\"3988dc0\" 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\uff0cSubmit your project requirements (series\/shell\/plating\/arrangement) | Receive selection advice<\/span><\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e652129 elementor-widget elementor-widget-button\" data-id=\"e652129\" 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\">Contact Us<\/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<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-fcaf496 e-flex e-con-boxed e-con e-parent\" data-id=\"fcaf496\" 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-d0aa229 elementor-widget elementor-widget-text-editor\" data-id=\"d0aa229\" 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-848351e elementor-grid-3 elementor-grid-tablet-2 elementor-grid-mobile-1 elementor-posts--thumbnail-top elementor-widget elementor-widget-posts\" data-id=\"848351e\" 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 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<div class=\"elementor-element elementor-element-f2d3965 e-flex e-con-boxed e-con e-parent\" data-id=\"f2d3965\" 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-14d1cc4 elementor-widget elementor-widget-spacer\" data-id=\"14d1cc4\" 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\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>MIL-DTL-38999 Four Series: Core Differences and Selection Guide for Series I\/II\/III\/IV Our Products The &#8220;Standard Answer&#8221; for Military Circular 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 &#8220;more signal, less power&#8221; in military avionics 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