MIL-DTL-38999 Series II connectors are designed for harsh environments, offering up to 128 contacts in a single insert. With a wide operating temperature range of -65 °C to 200 °C, they are ideal for demanding applications. Featuring various mounting options including front and rear wall mount, jam nut, and box mount receptacles, these connectors provide versatility in installation. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for reliable connectivity. Constructed with aluminum shells and offering plating options such as electroless nickel, these connectors ensure durability and performance. Meeting military specifications, they are suitable for use in rugged conditions.