MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts housed in an insert. With a wide operating temperature range of -65 °C to 200 °C, these environmentally sealed connectors offer reliable performance in demanding conditions. Available in various mounting options such as front and rear wall mount, jam nut, and box mount receptacles, they cater to diverse application needs. The connectors come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts for secure connections. Crafted from aluminum, they offer durability and are available with different plating options, including cadmium-free finishes for RoHS compliance. Suitable for military and industrial use, these connectors ensure high conductivity and ingress protection, ideal for critical electrical connections in rugged settings.