ASTM A563 Grado A & ASME/ANSI B18.2.2 174261 pcs - Hex nut 1/2" UNC thread 147639 pcs - Hex nut 5/8" UNC thread 27926 pcs - Hex nut 3/4" UNC thread 1663 pcs - Hex nut 7/8" UNC thread