MIL-DTL-38999 Series I connectors feature up to 128 contacts in an 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, these connectors offer RFI grounding plugs. With 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts. Constructed with high strength aluminum shells, they come in various plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, including RoHS certified cadmium-free finishes. Ideal for military and aerospace applications, these connectors provide reliable performance with a conductivity rating, environment-resistant design, and a mating life of 500 cycles.