MIL-DTL-38999 Series II connectors offer robust performance with up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Featuring various mounting options including front and rear wall mount, jam nut, and box mount receptacles, they ensure secure connectivity. Available in 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts for reliable connections. Constructed with aluminum shells and plated with options such as electroless nickel and cadmium finishes, they meet stringent military specifications for durability. With gold-plated contacts and a service rating of I, they guarantee excellent conductivity and a mating life of 500 cycles, suitable for demanding applications.