The 204521-2 is a 78-contact (Shell Size 5) subminiature rectangular plug connector with pins, qualified to MIL-DTL-24308 military standards. It features dimensions of 2.079 inches (52.81 mm) length, 0.441 inches (11.2 mm) width, and 2.406 inches (61.11 mm) overall depth, with a contact spacing of 0.039 inches (0.99 mm). The connector uses AS39029 contacts (Pin M39029/58-360) rated for wire sizes 22–28 AWG with insulation diameters of 0.4–0.8 mm², offering reliable high-speed termination by automatic machine crimping. This connector is designed for military and industrial applications requiring compact, high-density interconnections in aerospace, defense, and telecommunications systems where durability and standardized performance are critical.