MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts within a sealed insert. With a wide operating temperature range of -65 °C to 200 °C, these connectors offer reliability in extreme conditions. Available in various mounting styles such as front and rear wall mount, jam nut, and box mount receptacles, they cater to diverse application needs. The connectors, compliant with military specification MIL-DTL-38999 II, come in aluminum shells with options for plating including electroless nickel and cadmium finishes. Utilizing M39029 rear release crimp contacts, they ensure secure connections. With a service rating of I and a mating life of 500 cycles, these connectors are suitable for demanding applications.