MIL-DTL-38999 Series II connectors, designed for harsh environments, feature up to 128 contacts and are environmentally sealed, with an operating temperature range from -65 °C to 200 °C. These thin-walled, restricted-length connectors come in various mounting options, 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. The connectors, with aluminum shells, offer plating options such as cadmium and nickel, meeting RoHS certification. Designed for military specifications, they ensure reliable performance in demanding applications.