MIL-DTL-38999 Series II connectors are designed for rugged environments, featuring up to 128 contacts housed in a sealed insert. With an operating temperature range of -65 °C to 200 °C, these connectors offer reliable performance in extreme conditions. Available in various mounting options such as front and rear wall mount, jam nut, and box mount receptacles, they cater to diverse applications. The connectors come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts for secure connections. Crafted from aluminum, they offer durability and are offered with plating options like gold, electroless nickel, and cadmium finishes. Their bayonet coupling and removable crimp contacts ensure easy installation and maintenance. Suitable for military and industrial use, these connectors provide reliable conductivity and environmental resistance for demanding applications.