MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert for secure connectivity. With front and rear wall mount options, jam nut, and box mount receptacles, they offer versatility in installation. Operating between -65 °C and 200 °C, these connectors are environmentally sealed for reliable performance. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts for efficient connections. Constructed with aluminum shells and various plating options like cadmium and nickel, they meet RoHS compliance standards. Ideal for military and industrial applications, these connectors ensure durability and longevity in demanding settings.