MIL-DTL-38999 Series I connectors feature up to 128 contacts 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. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts ranging from sizes 22D to 8, including coax and twinax. Constructed with high-strength aluminum shells, they offer various plating options such as iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS-certified cadmium-free finishes. Suitable for military applications, these connectors ensure reliable performance with gold-plated contacts, a bayonet coupling mechanism, and a service rating of I for environment-resistant wall and jam nut mounting receptacle and plug types.
