Threading dies are used to cut external threads on cylindrical work-pieces.
The die nut is used for chasing or reconditioning the damaged threads.
Die nuts are not to be used for cutting new threads. The die nuts are available for different standards and sizes of threads. The die nut is turned with a spanner.
Tap extractor can be used for removing a broken tap.
For tapping copper or aluminium Kerosene is used as coolant.
Flutes are the spiral grooves which run to the length of the drill. The flutes helps to
1. To form the cutting edges
2. To curl the chips and allow these to come out
3. The coolant to flow to the cutting edge.