The MIL-DTL-38999 Series II connectors feature up to 128 contacts, designed for harsh environments with an operating temperature range of -65°C to 200°C. Available in various mounting styles including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in installation. These connectors come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts. Constructed with aluminum shells, they provide durability and are offered with plating options such as cadmium and nickel. With a mating type of bayonet, these connectors ensure secure connections in military and industrial applications, meeting stringent reliability standards.