The MIL-DTL-38999 Series I connectors are designed for harsh environments, offering up to 128 contacts within an insert. These connectors feature front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. With an operating temperature range of -65°C to 200°C, they are suitable for a wide range of applications. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they come in different plating options, including cadmium-free finishes for RoHS compliance. The connectors are environmentally sealed and provide reliable performance, making them ideal for military and industrial use.