MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with operating temperatures ranging from -65°C to 200°C. Available in various mounting styles including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in installation. The connectors come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts for reliable connections. Constructed with aluminum shells and offered in plating options such as electroless nickel and cadmium finishes, they ensure durability and performance in demanding applications. RoHS compliant options are available. Perfect for military, aerospace, and industrial use, these connectors provide secure and efficient electrical connections in challenging environments.