The MIL-DTL-38999 Series I connectors feature a rugged design suitable for harsh environments, with up to 128 contacts housed in a sealed insert. Operating efficiently in temperatures ranging from -65 °C to 200 °C, these connectors come in various mounting options including front wall, rear wall, and jam nut receptacles, with RFI grounding plugs available. Offering versatility, they are available in 9 shell sizes and 52 insert arrangements, with M39029 rear release crimp contacts in multiple sizes. Constructed with high strength aluminum shells, they are offered with different plating options such as cadmium and electroless nickel, including RoHS compliant finishes. Ideal for military applications, these connectors provide reliable connectivity in demanding conditions.