The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with front and rear wall mount options, as well as jam nut and box mount receptacles. With operating temperatures ranging from -65 °C to 200 °C, these connectors offer reliability in extreme conditions. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and various plating options, including cadmium-free finishes, they ensure durability and performance. Meeting military specification MIL-DTL-38999 II, these circular plugs are ideal for applications requiring rugged, environmentally sealed connectivity.