MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts housed in an insert that provides environmental sealing. With an operating temperature range of -65 °C to 200 °C, these connectors offer durability in extreme conditions. Available in various mounting options such as front wall, rear wall, jam nut, and box mount receptacles, they cater to diverse installation needs. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and offering plating options like electroless nickel and cadmium finishes, including RoHS certified variants, they ensure reliable performance while meeting environmental standards. Suitable for military and industrial applications, these MIL-DTL-38999 II connectors provide a secure and efficient electrical connection solution.