MIL-DTL-38999 Series I connectors offer robust performance in harsh environments, with up to 128 contacts sealed for environmental protection. Operating efficiently in temperatures ranging from -65 °C to 200 °C, they feature front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Available in 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts in various sizes. Constructed with high strength aluminum shells, they come in plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes. Suitable for military and industrial applications, these connectors ensure reliable performance with their gold-plated contacts, bayonet coupling, and environment-resistant design.