MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With a wide operating temperature range of -65 °C to 200 °C, these connectors are suitable for demanding applications. Available in various mounting options including front wall mount, rear wall mount, and jam nut receptacles, they offer versatility in installation. The connectors utilize M39029 rear release crimp contacts in different sizes, ensuring secure and reliable connections. Constructed with high strength aluminum shells and offering multiple plating options such as cadmium and nickel, they provide durability and corrosion resistance. These connectors comply with RoHS regulations, making them environmentally friendly. With a service rating of M, Twinax, and service class detail for wall and jam nut mounting receptacles and plugs, they meet stringent military specifications for performance and reliability.