The MIL-DTL-38999 Series II connectors boast exceptional ruggedness and versatility, with up to 128 contacts securely housed within an environmentally sealed insert. Engineered 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 connectivity. Crafted from durable aluminum with a choice of plating finishes, these connectors offer superior performance in temperatures ranging from -65 °C to 200 °C. Meeting stringent military specifications, they ensure optimal conductivity with gold-plated removable crimp contacts. Suitable for demanding applications, these connectors guarantee longevity with a mating life of 500 cycles and are designed for environment-resistant box and bulkhead mounting receptacle types.