The MIL-DTL-38999 Series I connectors boast a durable construction with up to 128 contacts, offering reliable performance in harsh environments. These circular connectors, available in various shell sizes and insert arrangements, feature front and rear wall mount options, as well as jam nut receptacles. Designed for military specifications, they ensure secure electrical connections with their bayonet coupling mechanism. The connectors are crafted from high-strength aluminum, with plating options including gold, electroless nickel, and cadmium-free finishes. Operating efficiently in temperatures ranging from -65°C to 200°C, they provide conductivity and environmental resistance for a wide range of applications.