MIL-DTL-38999 Series I connectors feature up to 128 contacts in a sealed insert, designed for harsh environments with a wide operating temperature range from -65 °C to 200 °C. Available in various shell sizes and insert arrangements, these connectors offer front wall mount, rear wall mount, and jam nut receptacles with RFI grounding options. Crafted from high-strength aluminum, they come in plating variations such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS-certified cadmium-free finishes. Utilizing M39029 rear release crimp contacts, they ensure reliable connectivity with sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax). Ideal for military applications, these connectors, meeting MIL-DTL-38999 I specifications, are built for durability, with a mating life of 500 cycles and a service rating of I for environment-resistant performance.