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. Available in various shell sizes and insert arrangements, they offer front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. These connectors utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, including coax and twinax options. Constructed with high-strength aluminum shells, they come with plating choices such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes available. Perfect for military and industrial applications, these connectors ensure reliable performance with features like bayonet coupling, gold contact plating, and A keyway polarization. The MS27505 connectors, classified under MIL-DTL-38999 I, serve as essential components for connectivity in demanding environments, offering durability, conductivity, and environmental resistance.