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 various configurations including front and rear wall mount receptacles and jam nut receptacles, they offer RFI grounding plugs for added performance. With 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax), ensuring versatility. Constructed with high-strength aluminum shells and offering multiple plating options such as cadmium and nickel, these connectors meet stringent military specifications for durability. Perfect for applications requiring reliable electrical connections in demanding conditions.