MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating range of -65 °C to 200 °C. These 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. Made of aluminum, with plating options like cadmium and nickel, they ensure reliable connectivity. RoHS compliant finishes are also offered. Suitable for military and industrial applications, these connectors provide durable and secure electrical connections in demanding conditions.