MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, suitable for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various mounting options including front and rear wall mount as well as jam nut receptacles, they offer versatility in installation. Compliant with military specification MIL-DTL-38999, these connectors utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, catering to different connectivity needs. Constructed with high-strength aluminum shells, they come in a range of plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes available. Designed for reliability, they feature gold-plated contacts, ensuring optimal conductivity and durability. With a mating type of bayonet coupling and a keyway polarization of D, these connectors are ideal for demanding applications where secure and efficient electrical connections are essential.