MIL-DTL-38999 Series II connectors offer reliable connectivity in harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an operating temperature range of -65°C to 200°C, these connectors are built for durability. Available in various mounting options such as front wall, rear wall, jam nut, and box mount receptacles, they cater to diverse applications. The connectors, crafted from aluminum, come in nine shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts. Plating options include cadmium-free finishes like electroless nickel, ensuring RoHS compliance. These connectors, with gold-plated contacts and a bayonet coupling design, guarantee efficient signal transmission with a mating life of 500 cycles. Suitable for military and industrial use, they provide reliable performance in demanding conditions.