The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts within an insert and offering reliable performance in temperatures ranging from -65 °C to 200 °C. These environmentally sealed connectors come in various configurations including 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 secure connections. Made of aluminum with plating options such as cadmium and nickel, these connectors ensure durability and conductivity. With a straight plug design and bayonet coupling, they are ideal for military and aerospace applications requiring EMI/RFI shielding. The Series II connectors meet MIL-DTL-38999 specifications, guaranteeing high quality and performance in demanding environments.