MIL-DTL-38999 Series II connectors offer high-performance connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, these connectors feature various mounting options 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 reliable connections. Constructed from aluminum with plating options such as electroless nickel and olive drab cadmium, these connectors ensure durability and longevity. With a wide operating temperature range of -65 °C to 200 °C, they are suitable for diverse applications. The Series II connectors meet stringent military specifications and RoHS compliance standards, making them an ideal choice for demanding environments requiring secure and efficient electrical connections.