MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert. These connectors offer secure connectivity with front wall mount, rear wall mount, jam nut, and box mount receptacles. Available in various shell sizes and insert arrangements, they use M39029 rear release crimp contacts for reliable performance. The connectors, made of aluminum, are plated with options like electroless nickel for durability. With an operating temperature range of -65 °C to 200 °C, they are suitable for demanding applications that require environmental sealing. RoHS compliant finishes ensure safety and quality, making these connectors ideal for military and industrial use.