MIL-DTL-38999 Series II connectors feature up to 128 contacts, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. These environmentally sealed connectors come in various configurations, including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. The connectors, with aluminum shells, offer plating options such as cadmium and electroless nickel, with RoHS compliant finishes. Suitable for military and industrial applications, these connectors ensure reliable performance in demanding conditions.