MIL-DTL-38999 Series II connectors offer high-performance connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, these connectors feature various mounting options 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 for reliable connections. With operating temperatures ranging from -65 °C to 200 °C, they ensure durability in extreme conditions. The aluminum shells come in multiple plating options, including RoHS compliant finishes, making them ideal for military and industrial applications that demand rugged reliability.