MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert. With front and rear wall mount options, jam nut, and box mount receptacles, they offer versatile connectivity solutions. Operating between -65 °C and 200 °C, these connectors are environmentally sealed for reliable performance. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and offered in various plating options including cadmium-free finishes, they meet RoHS compliance standards. Perfect for military and industrial applications, these connectors ensure durability and conductivity, with a mating cycle rating of 500 cycles.