MIL-DTL-38999 Series II connectors are designed for rugged environments, with up to 128 contacts in a sealed insert. Operating between -65°C and 200°C, these connectors come in various configurations including front and rear wall mount, jam nut, and box mount receptacles. Offering versatility, they feature straight, RFI grounding, and standard plugs with 90-degree cable clamps. With 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts, ensuring reliable connectivity. Constructed with aluminum shells and available in different plating options like gold and electroless nickel, these connectors meet stringent military specifications for durability and performance.