The MIL-DTL-38999 Series I connectors offer robust connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, these connectors feature front and rear wall mount options, as well as jam nut receptacles with RFI grounding plugs. With a wide operating temperature range of -65 °C to 200 °C, they ensure reliable performance in extreme conditions. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts, providing versatility for various applications. Constructed with high strength aluminum shells and offered in different plating options like electroless nickel and cadmium finishes, they meet stringent military specifications. Their bayonet coupling and gold-plated contacts ensure secure and durable connections, making them ideal for aerospace, defense, and industrial applications.