MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an operating temperature range of -65 °C to 200 °C, these connectors offer reliability in extreme conditions. Available in various shell sizes and insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. Constructed with high-strength aluminum shells and plated with options like electroless nickel and cadmium, they ensure durability and performance. The connector family includes front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs, meeting military specification MIL-DTL-38999 I standards for quality and reliability.