The MIL-DTL-38999 Series II connectors offer high performance in harsh environments with up to 128 contacts in a sealed insert. Operating between -65 °C and 200 °C, these connectors are versatile with various mounting options like front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for reliable connectivity. Constructed with aluminum shells and offered in plating options like electroless nickel and cadmium finishes, these connectors ensure durability. With features like bayonet coupling, removable crimp contacts, and gold plating, they meet stringent military specifications for reliable performance in demanding applications.