Introducing MIL-DTL-38999 Series I connectors, designed for harsh environments with up to 128 contacts housed in an insert. These connectors are meticulously crafted for durability, featuring front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs. With an operating temperature range spanning from -65 °C to 200 °C, they ensure reliable performance in extreme conditions. Available in 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts in various sizes. Crafted with high-strength aluminum shells, they offer a selection of plating options, including cadmium-free finishes for RoHS compliance. The MS27466 Connectors, Receptacle, Electrical, Wall Mounting Flange, Crimp Type, Bayonet Coupling are part of the esteemed 38999 Series I, meeting rigorous military specifications and offering a service rating of M for environment-resistant wall and jam nut mounting receptacle and plug types. With gold-plated contact pins, Electroless Nickel and Cadmium Olive Drab finishes, and C-keyway polarization, these connectors ensure optimal conductivity and ingress protection, making them ideal for a wide range of applications.