External Thread Cutting Dies

Between these cutting edges there are cavities which remove the chips.

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. The dies in these sets have a narrower width than standard dies making them a good choice for thread repair in tight spots. Round dies have three or more cutting edges depending on their size. 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 external thread also known as a screw thread is cut by hand with a round die which is fixed in a die stock. 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.