The 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, they offer reliable performance in extreme conditions. Available in various shell sizes and insert arrangements, these connectors come in high-strength aluminum shells with multiple plating options. They are ideal for military and aerospace applications, with RoHS-certified cadmium-free finishes also available. The connectors are bayonet-coupling, with options for front wall mount, rear wall mount, and jam nut receptacles, ensuring versatile installation. Utilizing M39029 rear release crimp contacts, they guarantee secure connections. Suitable for both wall and jam nut mounting, these connectors provide conductivity and ingress protection, making them essential for demanding environments.