N181501: Hexagonal Head Screw, 1" X 9-1/2"Hexagonal Head Screw designed for secure fastening in various applications. Features a thread length of 33. 53 mm (1 5 16 in), overall length of 241. 30 mm (9 1 2 in), and a diameter of 25. 40 mm (1. 0 in). Includes a head height of 15. 93 mm (5 8 in) and width across flats of 38. 10 mm (1 1 2 in) with a UNC2A thread. Made from high quality general steel. Finished with a durable zinc coating for enhanced corrosion resistance.