MIL-DTL-38999 Series II connectors, designed for rugged environments, feature up to 128 contacts in an insert with robust environmental sealing. Operating in temperatures ranging from -65 °C to 200 °C, these connectors offer reliable performance. Available in various mounting styles including front and rear wall mount, jam nut, and box mount receptacles, they cater to diverse installation needs. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts in different sizes. Constructed with aluminum shells, they offer durability, with plating options such as cadmium and nickel for enhanced protection. These connectors, part of the 38999 Series II, guarantee secure electrical connections in demanding military and industrial applications.