The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an operating temperature range of -65 °C to 200 °C, these connectors offer reliability in a wide range of conditions. Available in various mounting options including front wall, rear wall, jam nut, rear box, and front 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 various sizes. Constructed with aluminum shells and offering multiple plating options such as cadmium and nickel, they ensure robust performance and corrosion resistance. The RoHS compliant finishes provide added assurance for environmentally conscious applications. Suitable for military and industrial use, these connectors deliver dependable connectivity in demanding settings.