MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65°C to 200°C. Available in front wall mount, rear wall mount, and jam nut receptacles, they offer RFI grounding plugs and utilize M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they come in 9 shell sizes and 52 insert arrangements, offering versatility for different applications. Plating options include light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with selections for RoHS certified cadmium-free finishes. These connectors, compliant with MIL-DTL-38999 I military specification, are suitable for demanding environments requiring reliable electrical connections.