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 offers 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 utilize M39029 rear release crimp contacts in various sizes. Constructed with high strength aluminum shells, they come in plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, including RoHS certified finishes. Perfect for military and industrial applications, these connectors ensure reliable performance with features like gold contact plating, bayonet coupling, and conductive connectivity. Suitable for wall mounting with a shell size of 25 and 61 contacts, they meet stringent MIL-DTL-38999 I specifications for durability and longevity in demanding environments.