MIL-DTL-38999 Series II connectors offer reliable connectivity in harsh environments, featuring up to 128 contacts within an environmentally sealed insert. With an operating temperature range from -65 °C to 200 °C, these connectors are suitable for demanding applications. Available in various mounting styles such as front and rear wall mount, jam nut, and box mount receptacles, they provide flexibility in installation. The connectors come in a range of shell sizes and insert arrangements, utilizing M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and offering plating options like gold and electroless nickel, they ensure durability and conductivity. Meeting military specification MIL-DTL-38999 II, these circular plugs are designed for high-performance and reliability in critical systems.