The MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating in temperatures ranging from -65°C to 200°C, these connectors offer reliable performance. Available in various shell sizes and insert arrangements, they use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. With options for front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs, these connectors provide versatility. Constructed with high-strength aluminum shells and offered in different plating options, including cadmium-free finishes, they meet stringent military specifications. Suitable for box mounting applications, their bayonet coupling and gold contact plating ensure secure connections. With a service rating of M and service class E, they are designed for demanding environments, with a service life of 500 cycles. Water and dust resistant, these connectors are ideal for critical electrical connections in aerospace, defense, and industrial applications.