MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating between -65 °C and 200 °C, they offer versatility in various applications. Available in different shell sizes and insert arrangements, these connectors have options like front and rear wall mount, jam nut, and box mount receptacles. Built with aluminum shells and offered in plating options including cadmium-free finishes, they ensure durability and reliability. Utilizing M39029 rear release crimp contacts, they guarantee secure connections. With features like bayonet coupling and gold contact plating, these connectors meet stringent military specifications, making them ideal for demanding environments.