MIL-DTL-38999 Series II connectors feature up to 128 contacts sealed for harsh environments with an operating temperature range of -65 °C to 200 °C. Offering various mounting options such as front and rear wall mount, jam nut, and box mount receptacles, they come in 9 shell sizes and 52 insert arrangements. Utilizing M39029 rear release crimp contacts, these connectors are designed for durability with aluminum shells and plating options including gold, electroless nickel, and cadmium finishes. With a bayonet coupling mechanism, they ensure secure mating in military and industrial applications, meeting stringent performance standards.