MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert. These connectors are environmentally sealed, with an operating temperature range of -65 °C to 200 °C. Available in various mounting styles, including front and rear wall mount, jam nut, and box mount, they offer versatility for different applications. The connectors utilize M39029 rear release crimp contacts, with options for gold plating ensuring optimal conductivity. Constructed with aluminum shells and various plating finishes, including RoHS-certified options, they meet stringent military specifications for durability and performance in demanding conditions.