A38487: Hexagonal Head Bolt, M20 X 100Hexagonal Head Bolt designed for secure fastening in various applications. Measures 100 mm (3. 94 in) in length with a thread length of 28 mm (1. 1 in) and a thread pitch of 2. 50 mm (0. 1 in). Features a head thickness of 12. 72 mm (1 2 in) and a head width of 30 mm (1. 18 in) with a thread size of 20 mm (0. 79 in). Made from high quality general steel for durability and strength. Finished with a zinc coating for enhanced corrosion resistance.