MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range from -65 °C to 200 °C. This connector family includes front and rear wall mount, as well as jam nut receptacles, and RFI grounding plugs. With 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high strength aluminum shells, they offer multiple plating options such as cadmium, nickel, and anodized aluminum, with RoHS compliant finishes available. Suitable for military and industrial applications, these connectors provide reliable performance with features like bayonet coupling, gold contact plating, and environment-resistant design, ensuring durability in demanding conditions.