Sherwood: 5/8"X18 UNF HSS Hexagon Die Nut BS 1127. For use with spanners to clean and repair existing external screw threads. MPN: 5036140184435 EAN: 5036140184435 5/8"X18 UNF HSS Hexagon Die Nut Attributes: Dimensions Standard: BS 1127 Hex Width: 1.30in Material: High Speed Steel Thickness: 5/8in Thread Direction: Right Hand Thread Size: 5/8in. x 18 Thread Standard: UNF