External Thread Cutting Dies

High speed steel adjustable round dies have a set screw that adjusts the thread depth to over or under cut threads for a precise fit.

External thread cutting dies.

The dies in these sets have a narrower width than standard dies making them a good choice for thread repair in tight spots. A die cuts an external thread on cylindrical material such as a rod which creates a male threaded piece that functions like a bolt dies are generally made in two styles. An adjustable die may be adjusted either by an integrated screw or by a set of screws set in to the die holder termed a die stock. Round dies have three or more cutting edges depending on their size.

Thread forming and thread rolling are processes for forming rather than cutting screw threads with the former referring to creating internal threads and the latter external threads in both of these processes threads are formed into a blank by pressing a shaped tool commonly called a thread rolling die against the blank in a process similar to knurling. Between these cutting edges there are cavities which remove the chips.