The MIL-DTL-38999 Series II connectors offer robust performance in harsh environments, featuring up to 128 contacts housed in a secure insert. With a wide operating temperature range from -65°C to 200°C, these connectors are ideal for demanding applications. Available in various mounting options such as front and rear wall mount, jam nut, and box mount receptacles, they provide versatility in installation. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating different contact configurations. Constructed with aluminum shells and offering plating options like gold, electroless nickel, and cadmium-free finishes, they ensure reliable conductivity and corrosion resistance. Designed to meet military specification MIL-DTL-38999 II, these circular connectors are trusted for their durability and performance in critical environments.