MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, ideal 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, plating options include cadmium finishes, electroless nickel, and black anodized aluminum. RoHS certified options are also available. The connectors, designed for military applications, ensure reliable performance with features like bayonet coupling, gold contact plating, and 500 mating cycles durability. Suitable for box mounting with a back panel box mounting receptacle shell style, they offer environment-resistant protection and conductive connectivity. Perfect for demanding environments, these connectors meet MIL-DTL-38999 I specifications.