MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. These connectors come in various configurations including front and rear wall mount, jam nut, and box mount receptacles, with options for straight or angled plugs. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and offered in different plating options, such as cadmium and nickel, they meet military specification MIL-DTL-38999 II. Perfect for demanding applications, these connectors ensure reliable performance with features like gold contact plating, bayonet coupling, and RoHS compliant finishes.