MIL-DTL-38999 Series II connectors are ruggedly designed for harsh environments, featuring up to 128 contacts in an insert. Environmentally sealed and operating reliably in temperatures ranging from -65 °C to 200 °C, these connectors offer versatility with various mounting options including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and offering plating options such as electroless nickel and cadmium finishes, they meet RoHS compliance standards. The connectors, designed for military applications, ensure durability with a service rating of I and a mating life of 500 cycles. Suitable for demanding environments, they provide reliable connectivity for critical systems.