MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, these connectors feature front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs. With a wide operating temperature range of -65 °C to 200 °C, they ensure reliable performance in diverse conditions. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. Constructed with high-strength aluminum shells and various plating options including gold, electroless nickel, and cadmium-free finishes, these connectors meet rigorous military specifications for durability and performance. Perfect for applications requiring rugged and reliable connectivity, they offer a mating type of bayonet and a contact style of socket, with a service class detail of Environment Resistant Box and Through Bulkhead Mounting Receptacle Types.