MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert and offering reliable performance in temperatures ranging from -65 °C to 200 °C. These environmentally sealed connectors come in various mounting options such as front and rear wall mount, jam nut, and box mount receptacles. With options for straight, RFI grounding, and standard plugs, they accommodate diverse connectivity needs. Utilizing M39029 rear release crimp contacts, they ensure secure connections in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and available in different plating finishes including cadmium and nickel, these connectors provide durability and versatility. Suitable for military and industrial applications, they offer reliable performance with 500 mating cycles and comply with RoHS regulations, making them a dependable choice for demanding environments.