The MIL-DTL-38999 Series II connectors are designed for harsh environments, with up to 128 contacts sealed for protection. Operating between -65 °C and 200 °C, these connectors come in various styles including front and rear wall mount, jam nut, and box mount receptacles. Offering versatility, they are available in 9 shell sizes and 52 insert arrangements, with M39029 rear release crimp contacts. Constructed with aluminum shells and plated with options like cadmium and electroless nickel, they ensure durability. With a bayonet coupling and gold-plated contacts, they guarantee secure connectivity. Meeting military specifications for service in demanding conditions, these connectors are reliable for applications requiring high performance and environmental resistance.