{"id":33490,"date":"2026-04-25T09:45:21","date_gmt":"2026-04-25T01:45:21","guid":{"rendered":"https:\/\/aviaelectronics.com\/?post_type=product&#038;p=33490"},"modified":"2026-04-25T09:55:53","modified_gmt":"2026-04-25T01:55:53","slug":"d38999-20fg35pb","status":"publish","type":"product","link":"https:\/\/aviaelectronics.com\/en\/product\/d38999-20fg35pb\/","title":{"rendered":"D38999\/20FG35PB | 79-Pin Series III Square Flange Receptacle (Key B)"},"content":{"rendered":"\t\t<div data-elementor-type=\"product-post\" data-elementor-id=\"33490\" class=\"elementor elementor-33490\" data-elementor-post-type=\"product\">\n\t\t\t\t<div class=\"wd-negative-gap elementor-element elementor-element-274f4b5d e-flex e-con-boxed e-con e-parent\" data-id=\"274f4b5d\" 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-49252ae0 e-n-tabs-none elementor-widget elementor-widget-n-tabs\" data-id=\"49252ae0\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;tabs_justify_horizontal&quot;:&quot;stretch&quot;,&quot;horizontal_scroll_tablet&quot;:&quot;enable&quot;,&quot;horizontal_scroll&quot;:&quot;disable&quot;}\" data-widget_type=\"nested-tabs.default\">\n\t\t\t\t\t\t\t<div class=\"e-n-tabs\" data-widget-number=\"1227172576\" aria-label=\"\u0412\u043a\u043b\u0430\u0434\u043a\u0438. \u041e\u0442\u043a\u0440\u044b\u0432\u0430\u0439\u0442\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u043a\u043b\u0430\u0432\u0438\u0448 Enter \u0438\u043b\u0438 Space, \u0437\u0430\u043a\u0440\u044b\u0432\u0430\u0439\u0442\u0435 \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e Escape \u0438 \u043f\u0435\u0440\u0435\u043c\u0435\u0449\u0430\u0439\u0442\u0435\u0441\u044c \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u043a\u043b\u0430\u0432\u0438\u0448 \u0441\u043e \u0441\u0442\u0440\u0435\u043b\u043a\u0430\u043c\u0438.\">\n\t\t\t<div class=\"e-n-tabs-heading\" role=\"tablist\">\n\t\t\t\t\t<button id=\"e-n-tab-title-12271725761\" data-tab-title-id=\"e-n-tab-title-12271725761\" class=\"e-n-tab-title\" aria-selected=\"true\" data-tab-index=\"1\" role=\"tab\" tabindex=\"0\" aria-controls=\"e-n-tab-content-12271725761\" style=\"--n-tabs-title-order: 1;\">\n\t\t\t\t\t\t<span class=\"e-n-tab-title-text\">\n\t\t\t\tOverview\t\t\t<\/span>\n\t\t<\/button>\n\t\t\t\t<button id=\"e-n-tab-title-12271725762\" data-tab-title-id=\"e-n-tab-title-12271725762\" class=\"e-n-tab-title\" aria-selected=\"false\" data-tab-index=\"2\" role=\"tab\" tabindex=\"-1\" aria-controls=\"e-n-tab-content-12271725762\" style=\"--n-tabs-title-order: 2;\">\n\t\t\t\t\t\t<span class=\"e-n-tab-title-text\">\n\t\t\t\tDownload\t\t\t<\/span>\n\t\t<\/button>\n\t\t\t\t\t<\/div>\n\t\t\t<div class=\"e-n-tabs-content\">\n\t\t\t\t<div id=\"e-n-tab-content-12271725761\" role=\"tabpanel\" aria-labelledby=\"e-n-tab-title-12271725761\" data-tab-index=\"1\" style=\"--n-tabs-title-order: 1;\" class=\"e-active elementor-element elementor-element-18402a75 e-con-full e-flex e-con e-child\" data-id=\"18402a75\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"wd-negative-gap elementor-element elementor-element-23b32a10 e-flex e-con-boxed e-con e-child\" data-id=\"23b32a10\" 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-37f71257 e-con-full e-flex e-con e-child\" data-id=\"37f71257\" 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-1ddf688d elementor-widget elementor-widget-heading\" data-id=\"1ddf688d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">D38999\/20FG35PB Series III Triple-Start Thread and Mechanical Integrity<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-38605566 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"38605566\" 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>The <a href=\"https:\/\/aviaelectronics.com\/product\/d38999-20fg35pb\/\">D38999\/20FG35PB<\/a> is engineered for specialized electronic grids that must maintain absolute signal continuity under extreme mechanical stress. As a Series III component, it utilizes a self-locking, triple-start threaded coupling mechanism that provides superior security compared to traditional bayonet systems. This design ensures the connector remains firmly mated during high-frequency harmonic vibrations typical of aerospace propulsion environments. The Type 20 square flange housing allows for a stable four-point mounting on equipment panels, distributing the weight of heavy 79-wire cable harnesses evenly across the chassis to prevent mechanical fatigue.<\/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-52e111e8 e-con-full e-flex e-con e-child\" data-id=\"52e111e8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-65280ff7 elementor-widget elementor-widget-heading\" data-id=\"65280ff7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Key Specifications<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4327baef elementor-widget elementor-widget-wd_table\" data-id=\"4327baef\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_table.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"wd-el-table-wrap wd-reset-all-last\">\n\t\t\t<table class=\"wd-el-table\">\n\t\t\t\t\t\t\t\t\t<thead class=\"text-left\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<tr class=\"wd-table-row elementor-repeater-item-4548a96\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<th class=\"wd-table-cell elementor-repeater-item-23bceac\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t\t<p>Shell Material<\/p>\t\t\t\t\t\t\t\t<\/th>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<th class=\"wd-table-cell elementor-repeater-item-a60ad78\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t\t<p>Voltage Rating<\/p>\t\t\t\t\t\t\t\t<\/th>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<th class=\"wd-table-cell elementor-repeater-item-a18c3a8\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t\t<p>Current Rating<\/p>\t\t\t\t\t\t\t\t<\/th>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<th class=\"wd-table-cell elementor-repeater-item-7cf407f\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t\t<p>Operating Temp<\/p>\t\t\t\t\t\t\t\t<\/th>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<th class=\"wd-table-cell elementor-repeater-item-c7f0263\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t\t<p>Ingress Protection<\/p>\t\t\t\t\t\t\t\t<\/th>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<th class=\"wd-table-cell elementor-repeater-item-07afc95\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t\t<p>Mating Cycles<\/p>\t\t\t\t\t\t\t\t<\/th>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<th class=\"wd-table-cell elementor-repeater-item-1228714\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t\t<p>Keying &amp; Polarization<\/p>\t\t\t\t\t\t\t\t<\/th>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<th class=\"wd-table-cell elementor-repeater-item-2550b26\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t\t<p>Coupling<\/p>\t\t\t\t\t\t\t\t<\/th>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/tr>\n\t\t\t\t\t<\/thead>\n\t\t\t\t\n\t\t\t\t<tbody class=\"text-left\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<tr class=\"wd-table-row elementor-repeater-item-3f17c50\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<td class=\"wd-table-cell elementor-repeater-item-e442563\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t<p>Aluminum alloy<\/p>\t\t\t\t\t\t\t<\/td>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<td class=\"wd-table-cell elementor-repeater-item-bbe7ecc\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t<p>~1000 VAC<\/p>\t\t\t\t\t\t\t<\/td>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<td class=\"wd-table-cell elementor-repeater-item-186a328\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t<p>~23 A<\/p>\t\t\t\t\t\t\t<\/td>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<td class=\"wd-table-cell elementor-repeater-item-7c911fb\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t<p>-65 \u00b0C to +200 \u00b0C<\/p>\t\t\t\t\t\t\t<\/td>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<td class=\"wd-table-cell elementor-repeater-item-8ec2577\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t<p>IP67<\/p>\t\t\t\t\t\t\t<\/td>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<td class=\"wd-table-cell elementor-repeater-item-0ebb0b4\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t<p>500<\/p>\t\t\t\t\t\t\t<\/td>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<td class=\"wd-table-cell elementor-repeater-item-9dd8a1a\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t<p>B<\/p>\t\t\t\t\t\t\t<\/td>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<td class=\"wd-table-cell elementor-repeater-item-63106e1\" colspan=\"1\" rowspan=\"1\">\n\t\t\t\t\t\t\t\t<p>threaded coupling<\/p>\t\t\t\t\t\t\t<\/td>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/tr>\n\t\t\t\t<\/tbody>\n\t\t\t<\/table>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3e63c308 e-con-full e-flex e-con e-child\" data-id=\"3e63c308\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-17448f0 e-con-full e-flex e-con e-child\" data-id=\"17448f0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-48f51837 elementor-widget elementor-widget-image\" data-id=\"48f51837\" 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\" width=\"300\" height=\"300\" src=\"https:\/\/aviaelectronics.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" class=\"attachment-medium size-medium wp-image-33495\" alt=\"D38999\/20FG35PB-dimensions\" srcset=\"\" sizes=\"(max-width: 300px) 100vw, 300px\" data-src=\"https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-dimensions-300x300.webp\" data-srcset=\"https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-dimensions-300x300.webp 300w, https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-dimensions-150x150.webp 150w, https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-dimensions-768x768.webp 768w, https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-dimensions-12x12.webp 12w, https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-dimensions-430x430.webp 430w, https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-dimensions-700x700.webp 700w, https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-dimensions.webp 800w\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8bbddee e-con-full e-flex e-con e-child\" data-id=\"8bbddee\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4e473418 elementor-widget elementor-widget-heading\" data-id=\"4e473418\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">High-Density 21-35 Layout and Pin Contact Precision<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4562eb5d color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"4562eb5d\" 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>Within the size 21 aluminum alloy shell, the D38999\/20FG35PB facilitates seventy-nine independent signal channels using the 21-35 insert arrangement. These channels utilize Size 22D pin contacts, which are precision-machined and finished with premium gold plating to ensure low contact resistance and maximum protection against atmospheric oxidation. This ultra-high-density configuration is essential for modern avionics stacks and tactical communication hubs where a massive volume of sensor data and control logic must be routed through a single, compact interface without compromising signal fidelity.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-728d7d4c e-con-full e-flex e-con e-child\" data-id=\"728d7d4c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4d26316 elementor-widget elementor-widget-heading\" data-id=\"4d26316\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Specialized B-Keying for Enhanced System Safety<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-596bd4f0 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"596bd4f0\" 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 data-path-to-node=\"13\">The &#8220;B&#8221; designation indicates a specialized polarization keyway, serving as a critical mechanical safeguard in dense electronic environments. In systems where multiple size 21 connectors are co-located on the same bulkhead, the &#8220;B&#8221; keying prevents accidental cross-mating with plugs configured for standard &#8220;N&#8221; or other alternative key positions. This physical lockout ensures that critical power or data streams are not misrouted, which could otherwise lead to catastrophic hardware failure. This standardized indexing logic simplifies complex assembly processes and streamlines field maintenance by providing intuitive, error-proof mating.<\/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-17e3964e e-con-full e-flex e-con e-child\" data-id=\"17e3964e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-2d3464b0 e-con-full e-flex e-con e-child\" data-id=\"2d3464b0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-27a5507c elementor-widget elementor-widget-heading\" data-id=\"27a5507c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Environmental Hardening and Class F EMI Shielding<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-274a4f67 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"274a4f67\" 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 data-path-to-node=\"20\">The &#8220;F&#8221; class finish of the <a href=\"https:\/\/www.aviaconnector.com\/?mil-dtl-38999-series-iii-connectors-datasheets\/121.html\" target=\"_blank\" rel=\"noopener\">D38999\/20FG35PB<\/a> involves electroless nickel plating over a high-strength aluminum shell, providing an optimal balance of corrosion resistance and electrical conductivity. This finish is vital for maintaining an effective Faraday cage around the 79-pole interface, ensuring superior EMI and RFI shielding performance in electromagnetically noisy environments. Internally, the connector is equipped with high-resilience fluorosilicone interfacial seals and rear wire-sealing grommets. These elements create a moisture-proof and dust-proof barrier capable of withstanding rapid pressure changes at high altitudes and exposure to maritime salt spray.<\/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-2cd63b1d e-con-full e-flex e-con e-child\" data-id=\"2cd63b1d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-62eda7a0 elementor-widget elementor-widget-image\" data-id=\"62eda7a0\" 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\" width=\"300\" height=\"300\" src=\"https:\/\/aviaelectronics.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" class=\"attachment-medium size-medium wp-image-33494\" alt=\"D38999\/20FG35PB-side-view\" srcset=\"\" sizes=\"(max-width: 300px) 100vw, 300px\" data-src=\"https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-side-view-300x300.webp\" data-srcset=\"https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-side-view-300x300.webp 300w, https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-side-view-150x150.webp 150w, https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-side-view-768x768.webp 768w, https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-side-view-12x12.webp 12w, https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-side-view-430x430.webp 430w, https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-side-view-700x700.webp 700w, https:\/\/aviaelectronics.com\/wp-content\/uploads\/2026\/04\/D3899920FG35PB-side-view.webp 800w\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e3aee60 e-con-full e-flex e-con e-child\" data-id=\"e3aee60\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6d014b20 elementor-widget elementor-widget-heading\" data-id=\"6d014b20\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">100% Scoop-Proof Protection and Field Serviceability<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-41581b21 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"41581b21\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ol start=\"1\" data-path-to-node=\"25\"><li><p data-path-to-node=\"11\">Reliability in the field is further enhanced by the D38999\/20FG35PB\u2019s 100% scoop-proof shell design. This feature ensures that the seventy-nine pin contacts are recessed deeply enough to prevent them from being bent or damaged if the mating plug is accidentally tilted during blind-mating scenarios. For ease of service, the receptacle utilizes a rear-release crimp contact system, allowing technicians to install or replace individual wires using standard tools without disassembling the entire panel mount. This combination of mechanical protection and serviceability makes the D38999\/20FG35PB a future-proof interconnect solution for demanding global applications.<\/p><\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6aeb224d e-con-full e-flex e-con e-child\" data-id=\"6aeb224d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-386b3223 elementor-widget elementor-widget-heading\" data-id=\"386b3223\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">FAQ<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-449e18fe elementor-widget elementor-widget-n-accordion\" data-id=\"449e18fe\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;default_state&quot;:&quot;expanded&quot;,&quot;max_items_expended&quot;:&quot;one&quot;,&quot;n_accordion_animation_duration&quot;:{&quot;unit&quot;:&quot;ms&quot;,&quot;size&quot;:400,&quot;sizes&quot;:[]}}\" data-widget_type=\"nested-accordion.default\">\n\t\t\t\t\t\t\t<div class=\"e-n-accordion\" aria-label=\"Accordion. Open links with Enter or Space, close with Escape, and navigate with Arrow Keys\">\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1150\" class=\"e-n-accordion-item\" open>\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"1\" tabindex=\"0\" aria-expanded=\"true\" aria-controls=\"e-n-accordion-item-1150\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><h3 class=\"e-n-accordion-item-title-text\"> <h3>How many contacts are in the 21-35 layout?<\/h3> <\/h3><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1150\" class=\"elementor-element elementor-element-61ec6009 e-con-full e-flex e-con e-child\" data-id=\"61ec6009\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-686fcad4 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"686fcad4\" 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 data-start=\"178\" data-end=\"667\">The 21-35 arrangement provides 79 signal channels using size 22D pin contacts, offering one of the highest densities available in a size 21 shell.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1151\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"2\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1151\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><h3 class=\"e-n-accordion-item-title-text\"> <h3>What is the benefit of the \"B\" keyway polarization?<\/h3> <\/h3><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1151\" class=\"elementor-element elementor-element-2d7b2d5b e-con-full e-flex e-con e-child\" data-id=\"2d7b2d5b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-20814950 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"20814950\" 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 data-start=\"1000\" data-end=\"1376\">It provides a unique mechanical alignment that prevents the connector from mating with standard &#8220;N&#8221; key plugs, which is vital for safety in multi-connector panels.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1152\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"3\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1152\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><h3 class=\"e-n-accordion-item-title-text\"> <h3>Does the \"F\" finish help with grounding?<\/h3> <\/h3><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-1152\" class=\"elementor-element elementor-element-ca45b01 e-con-full e-flex e-con e-child\" data-id=\"ca45b01\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2352fe color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"2352fe\" 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 data-start=\"5177\" data-end=\"5393\">Yes, the electroless nickel (F) finish is highly conductive, ensuring a reliable low-impedance ground path to the chassis for effective EMI shielding.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1153\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"4\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1153\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><h3 class=\"e-n-accordion-item-title-text\"> <h3>Is the D38999\/20FG35PB intermateable with Series I or II?<\/h3> <\/h3><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div class=\"wd-negative-gap elementor-element elementor-element-65e20e22 e-flex e-con-boxed e-con e-child\" role=\"region\" aria-labelledby=\"e-n-accordion-item-1153\" data-id=\"65e20e22\" 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-7f820ac3 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"7f820ac3\" 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 data-start=\"2706\" data-end=\"2967\">No, MIL-DTL-38999 Series III connectors use a unique threaded coupling system that is not compatible with the bayonet-style Series I or Series II.<\/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\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-1154\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"5\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-1154\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><h3 class=\"e-n-accordion-item-title-text\"> <h3>Can this connector be used in unpressurized aerospace compartments?<\/h3> <\/h3><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div class=\"wd-negative-gap elementor-element elementor-element-625e4af0 e-flex e-con-boxed e-con e-child\" role=\"region\" aria-labelledby=\"e-n-accordion-item-1154\" data-id=\"625e4af0\" 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-74da762e color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"74da762e\" 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 data-start=\"3310\" data-end=\"3600\">Absolutely. The integrated fluorosilicone seals and rugged construction are specifically designed to maintain integrity during rapid pressure cycles and high-altitude exposure.<\/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\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<script type=\"application\/ld+json\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How many contacts are in the 21-35 layout?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The 21-35 arrangement provides 79 signal channels using size 22D pin contacts, offering one of the highest densities available in a size 21 shell.\"}},{\"@type\":\"Question\",\"name\":\"What is the benefit of the \\\"B\\\" keyway polarization?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It provides a unique mechanical alignment that prevents the connector from mating with standard &#8220;N&#8221; key plugs, which is vital for safety in multi-connector panels.\"}},{\"@type\":\"Question\",\"name\":\"Does the \\\"F\\\" finish help with grounding?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, the electroless nickel (F) finish is highly conductive, ensuring a reliable low-impedance ground path to the chassis for effective EMI shielding.\"}},{\"@type\":\"Question\",\"name\":\"Is the D38999\\\/20FG35PB intermateable with Series I or II?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, MIL-DTL-38999 Series III connectors use a unique threaded coupling system that is not compatible with the bayonet-style Series I or Series II.\"}},{\"@type\":\"Question\",\"name\":\"Can this connector be used in unpressurized aerospace compartments?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Absolutely. The integrated fluorosilicone seals and rugged construction are specifically designed to maintain integrity during rapid pressure cycles and high-altitude exposure.\"}}]}<\/script>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div id=\"e-n-tab-content-12271725762\" role=\"tabpanel\" aria-labelledby=\"e-n-tab-title-12271725762\" data-tab-index=\"2\" style=\"--n-tabs-title-order: 2;\" class=\" elementor-element elementor-element-77bd6c4 e-con-full e-flex e-con e-child\" data-id=\"77bd6c4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-2befbf26 e-con-full e-flex e-con e-child\" data-id=\"2befbf26\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-59e16bcb e-con-full e-flex e-con e-child\" data-id=\"59e16bcb\" 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-b4aa5d2 elementor-widget elementor-widget-heading\" data-id=\"b4aa5d2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Certification<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-13d1d325 e-con-full e-flex e-con e-child\" data-id=\"13d1d325\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-f84961f e-con-full e-flex e-con e-child\" data-id=\"f84961f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-25dd3403 elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"25dd3403\" 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Features &#8220;B&#8221; polarization and &#8220;F&#8221; electroless nickel finish for high-density grids.<\/p>\n","protected":false},"featured_media":33491,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[893],"product_cat":[19,23],"product_tag":[892,891],"class_list":{"0":"post-33490","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-avia-connector","7":"product_cat-circular-connectors","8":"product_cat-mil-dtl-38999-series-iii-connectors","9":"product_tag-circular-connectors","10":"product_tag-mil-dtl-38999","11":"pa_contact-gender-pinmale","12":"pa_finish-electroless-nickel-plating","13":"pa_military-type-mil-dtl-38999-i-ii-iii-series","14":"pa_pin-079-pin","15":"pa_product-type-receptacle","16":"pa_shell-material-aluminum-alloy","17":"pa_termination-style-crimp","19":"first","20":"instock","21":"shipping-taxable","22":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/aviaelectronics.com\/en\/wp-json\/wp\/v2\/product\/33490","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aviaelectronics.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/aviaelectronics.com\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/aviaelectronics.com\/en\/wp-json\/wp\/v2\/comments?post=33490"}],"version-history":[{"count":0,"href":"https:\/\/aviaelectronics.com\/en\/wp-json\/wp\/v2\/product\/33490\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aviaelectronics.com\/en\/wp-json\/wp\/v2\/media\/33491"}],"wp:attachment":[{"href":"https:\/\/aviaelectronics.com\/en\/wp-json\/wp\/v2\/media?parent=33490"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/aviaelectronics.com\/en\/wp-json\/wp\/v2\/product_brand?post=33490"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/aviaelectronics.com\/en\/wp-json\/wp\/v2\/product_cat?post=33490"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/aviaelectronics.com\/en\/wp-json\/wp\/v2\/product_tag?post=33490"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}