The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts within an insert. With a wide operating temperature range of -65 °C to 200 °C, these connectors are ideal for demanding applications. Available in various mounting styles such as front wall, rear wall, and jam nut, they offer versatility in installation. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating different contact sizes. Constructed with aluminum shells and offering multiple plating options including cadmium and nickel, they ensure durability and reliability. With RoHS compliant finishes available, they meet environmental standards. These connectors, with their military specification design, are suitable for use in aerospace, defense, and other rugged environments.