MIL-DTL-38999 Series II connectors offer reliable performance in harsh environments, featuring up to 128 contacts in an insert for versatile connectivity. These environmentally sealed connectors operate seamlessly in temperatures ranging from -65°C to 200°C. With various mounting options including front wall, rear wall, jam nut, and box mount receptacles, they ensure secure installations. Available in aluminum shells with different plating options such as cadmium and nickel, these connectors meet RoHS compliance standards. Designed for military specifications, they guarantee durability with a service rating of M and a mating life of 500 cycles. The 55-contact variant, with gold-plated removable crimp contacts, is ideal for applications requiring high conductivity and ingress protection. Whether for box or bulkhead mounting, these connectors in shell size 16-55 are essential for demanding environments.