3/8" UNC Hex Nut - Galvanised Mild Steel - BS 1768 - 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 Dimensions: 3/8" x 16 TPI 15 mm Across the flats 14 mm Point to Point 8 mm thickness