The 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 provide versatile connectivity solutions. These circular plugs, available in various shell sizes and insert arrangements, utilize M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and offering different plating options, including RoHS certified finishes, they ensure durability and performance. Operating in temperatures ranging from -65 °C to 200 °C, these connectors are ideal for military and industrial applications requiring reliability in extreme conditions.