MIL-DTL-38999 Series I connectors feature up to 128 contacts housed within a sealed insert, designed for harsh environments with an operating range of -65°C to 200°C. Available in various mounting options like front wall, rear wall, and jam nut receptacles, this connector family offers versatility for different applications. With 52 insert arrangements and M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, it provides flexibility in connectivity. The connectors come in high-strength aluminum shells with plating options including cadmium and nickel, ensuring durability. Meeting military specification MIL-DTL-38999 I, these circular receptacles are ideal for demanding environments requiring reliable electrical connections.