M8 Galvanised Heavy Hexagon Nut - A194 Grade 7 Tapped Oversize Since hot-dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized heavy hex nuts are tapped oversize to compensate for the corrosion resistant coating on the thread of the bolt Quenched & tempered alloy steel heavy hex nuts Where: e = point to point m = thickness s = across flats d = Thread e - 14.38 mm (min) m - 7.64 mm (min) s - 12.73 mm (min) d - M8 Thread Pitch -1.25 mm