MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, with an operating temperature range of -65°C to 200°C. Available in various mounting styles such as front wall mount, rear wall mount, jam nut, and box mount, these connectors offer versatility for different applications. Designed for harsh environments, they come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts. The connectors are made of aluminum with options for plating finishes including cadmium and nickel, ensuring durability. RoHS compliant versions are also available, making them suitable for a wide range of applications requiring reliable electrical connectivity in demanding conditions.