MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. This connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Offered 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 with plating options such as cadmium, electroless nickel, and black anodized aluminum, with RoHS-certified finishes available. Suitable for military and industrial applications, these connectors ensure reliable performance with 500 mating cycles and resistance to environmental factors.