The MIL-DTL-38999 Series II connectors, designed for harsh environments, feature up to 128 contacts in an insert with environmental sealing. Operating efficiently in temperatures ranging from -65 °C to 200 °C, these connectors offer versatility with various mounting options including front and rear wall mounts, jam nuts, and box mounts. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts, ensuring secure connections. Constructed with aluminum shells and offered in different plating options such as cadmium and nickel, these connectors meet RoHS compliance standards. Perfect for military and industrial applications, they provide reliable performance with a mating life of 500 cycles.