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 mounting styles including front and rear wall mount, jam nut, and box mount receptacles, they provide flexibility for different applications. The connectors come in aluminum shells with options for plating, such as electroless nickel and iridescent yellow cadmium, catering to diverse needs. Utilizing M39029 rear release crimp contacts, they ensure secure connections. Meeting military specification MIL-DTL-38999 II, these circular plugs are suitable for demanding industrial and military environments.