MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert. With an operating temperature range of -65 °C to 200 °C, they offer reliability in extreme conditions. These connectors come in various mounting styles, including jam nut, front and rear wall mount, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and plated in options like cadmium or electroless nickel, they ensure durability. Ideal for military and industrial applications, these connectors meet stringent standards for performance and reliability.