The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an operating temperature range from -65°C to 200°C, these connectors offer reliable performance in extreme conditions. Available in various mount types such as front wall, rear wall, jam nut, and box mount receptacles, they cater to diverse installation needs. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts in multiple sizes. Constructed with durable aluminum shells, they offer plating options including electroless nickel and cadmium finishes. Suitable for military applications, these connectors ensure secure and efficient electrical connections in demanding settings.