The MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts housed in an environmentally sealed insert. With an operating temperature range from -65 °C to 200 °C, these connectors are suitable for a wide range of applications. Available in various shell sizes and insert arrangements, they offer versatility in design. Constructed with high-strength aluminum shells, they ensure durability. Plating options include light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, catering to different environmental requirements. These connectors, compliant with RoHS regulations, feature front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, providing flexibility in installation. Utilizing M39029 rear release crimp contacts, they guarantee secure and reliable connections. With a mating type of bayonet and contact gender of female, these connectors are ideal for various industrial and military applications.