MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, with an operating temperature range from -65 °C to 200 °C. These harsh environment 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 use M39029 rear release crimp contacts in multiple sizes. Constructed with aluminum shells and offering plating options such as cadmium and nickel, these connectors meet stringent military specifications for durability. Perfect for applications requiring reliable electrical connections in challenging environments.