Sherwood: 3/8"X20 BSF HSS Hexagon Die Nut BS 1127. For use with spanners to clean and repair existing external screw threads. MPN: 5036140282254 EAN: 5036140282254 3/8"X20 BSF HSS Hexagon Die Nut Attributes: Dimensions Standard: BS 1127 Hex Width: 0.92in Material: High Speed Steel Thickness: 3/8in Thread Direction: Right Hand Thread Size: 3/84in. x 20 Thread Standard: BSF