Hand Threading and Reaming - Stocks and Dies

Dies are cutting tools that produce external screw threads, also known as male screw threads. They’re commonly used with die stocks, which are tools that hold round and hex dies to ensure proper alignment and uniform threads. Dies are used to create new threads, and to repair worn and damaged threads.  The dies are slightly tapered on one side to ensure easier start.

Type of dies Solid circular and hexagonal die - is not adjustable and is used for re-threading damaged or chasing threads.  It is not used for cutting new threads as this will damage the die.  It is also referred to as a die nut or chaser die.  It can be turned by a special stock or spanner.

Circular split die - is adjustable.  This is done so that when cutting thread, it is done in more than one run.  This is done by adjusting the screws on the stock.  This will ensure that the cut is done gradually with each run giving a thread with a good finish and without damage to the die.  Once the groove on the die is completely adjusted closed the thread is at its correct depth

Rectangular die - consist of two pieces that fit into a rectangular or circular stock.  The adjustment is done by turning in the stock handles in until the correct depth is achieved or turning in the adjustment screw.