Sherwood: 3/8"X18 NPT HSS Hexagon Die Nut For use with spanners to clean and repair existing external screw threads. MPN: 5036140185227 EAN: 5036140185227 3/8"X18 NPT HSS Hexagon Die Nut Attributes: Dimensions Standard: ISO 529 Hex Width: 1.50in Material: High Speed Steel Thickness: 5/8in Thread Direction: Right Hand Thread Size: 3/8in. x 18 Thread Standard: NPT