The MIL-DTL-38999 Series II connectors, designed for harsh environments, offer reliable electrical connections with up to 128 gold-plated contacts in an environmentally sealed insert. Operating effectively in temperatures ranging from -65 °C to 200 °C, these connectors come in various configurations including front and rear wall mount, jam nut, and box mount receptacles. Featuring bayonet coupling for secure mating, they ensure durability with aluminum shells and options for RoHS compliant plating finishes. Utilizing M39029 crimp contacts, they guarantee performance for E-rated service in demanding applications. With a service life of 500 cycles, these connectors are ideal for environment-resistant box and through bulkhead mounting receptacle types.