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 from -65 °C to 200 °C. Available in various mounting options including front and rear wall mount and jam nut receptacles, these connectors comply with military specification MIL-DTL-38999 I. Utilizing M39029 rear release crimp contacts, they offer reliable connectivity in sizes 22D, 22M, 22, 20, 16, and 8, including coax and twinax configurations. The high strength aluminum shells come with plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS compliant cadmium-free finishes also available. Perfect for demanding applications, they ensure secure and durable electrical connections with gold-plated contacts, bayonet coupling, and N keyway polarization.