The MIL-DTL-38999 Series II connectors are designed for harsh environments, with up to 128 contacts in an insert. These environmentally sealed connectors have a wide operating temperature range from -65 °C to 200 °C. Featuring various mounting options like front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in installation. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts for secure connections. With aluminum shells and multiple plating options including cadmium-free finishes, they ensure durability and reliability in military and aerospace applications.