MIL-DTL-38999 Series I connectors are designed for rugged environments, featuring up to 128 contacts in an insert with environmental sealing. Operating between -65 °C and 200 °C, these connectors offer versatility in harsh conditions. Available in front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, they ensure secure connections. With 9 shell sizes and 52 insert arrangements, they accommodate various contact types, including M39029 rear release crimp contacts. Constructed of high-strength aluminum with plating options like cadmium and nickel, they meet stringent military specifications. Suitable for demanding applications, these connectors provide reliable performance with RoHS compliant finishes available.