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 shell sizes and insert arrangements, they offer front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. Constructed from high-strength aluminum shells, these connectors come in RoHS-certified cadmium-free finishes, including options like electroless nickel and black anodized aluminum. Utilizing M39029 rear release crimp contacts, they ensure secure connections, with contact plating in gold for optimal conductivity. Suitable for military and industrial applications, these circular receptacles are engineered for durability and reliability, meeting stringent MIL-DTL-38999 I specifications.