745412-7 is an AMPLIMITE Subminiature O Type HD-20 full metal-shell straight posted plug connector featuring 37 contact positions with grounding indents. This shell size 4 connector has dimensions of 2.729 inches (69.32 mm) for dimension A, 2.500 inches (63.50 mm) for dimension B, and 0.494 inches (12.55 mm) for dimension C. The connector features a tin-plated steel shell, 94V-0 rated black thermoplastic insert, and brass pin contacts with gold plating (Code A) on the mating end and tin-lead on the termination end with nickel underplating. Preloaded with size 20 DF posted pin contacts, this connector is designed for PCB mounting applications requiring reliable D-sub interconnections in industrial and electronic equipment.