The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert. With front and rear wall mount options, jam nut, and box mount receptacles, they offer versatility in installation. These connectors, with a wide operating temperature range of -65 °C to 200 °C, are environmentally sealed for reliable performance. Available in various shell sizes and insert arrangements, they use M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and plated with options like gold and electroless nickel, they ensure durability and conductivity. Meeting military specification MIL-DTL-38999 II, they are ideal for demanding applications where ruggedness is essential.