MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, suitable 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. Utilizing M39029 rear release crimp contacts, they come in high strength aluminum shells with various plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, including RoHS certified finishes. Ideal for military and industrial applications, these connectors ensure reliable performance with their durable construction and conductive properties.