MIL-DTL-38999 Series I connectors are designed for harsh environments, with up to 128 contacts in an insert. These connectors feature front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Operating in temperatures ranging from -65 °C to 200 °C, they offer versatility and reliability. With 9 shell sizes and 52 insert arrangements available, they accommodate various needs. The connectors utilize M39029 rear release crimp contacts, ensuring secure connections. Constructed with high strength aluminum shells and offered in different plating options, including cadmium-free finishes, they meet stringent military specifications. Suitable for applications requiring environmental resistance, these connectors are ideal for demanding settings.