MIL-DTL-38999 Series I connectors feature up to 128 contacts in a sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various configurations including front wall mount, rear wall mount, and jam nut receptacles, they offer RFI grounding plugs and rear release crimp contacts. With 52 insert arrangements and 9 shell sizes, these connectors are versatile and reliable. Constructed with high-strength aluminum shells and plated in options like iridescent yellow cadmium and electroless nickel, they meet stringent military specifications. Their bayonet coupling and gold-plated socket contacts ensure secure and durable connections, making them ideal for demanding applications.