The Dormer M Die nut is a hexagon die nut. It is designed to repair or clean out damaged external threads by re cutting the original thread form by hand. A wrench or spanner can be used to rotate the die nut around the outside of the bolt thus it can be used in difficult to access locations. It has HSS with bright finish for repairing damaged thread in free machining and plain carbon steel, ferrite stainless steel and grey, malleable, ductile and compacted graphite cast iron.

Thread tolerance class
High speed steel tool material
Right hand rotation and cutting
Thread form and metric coarse
BS 1127 1950 Round dies standards