Straight flute taps are the only type of taps that can be used by hand, but they may also be used in a machine if required. They can be used for either through or blind holes. When tapping blind holes straight flute taps should be used in sets. The three taps which form a set are known by more than one name.
1. Taper or First tap
2. Second or Intermediate tap
3. Bottoming, third or plug tap.
Metric coarse straight flute taps.
Tolerance: Class 2 for 6H Fit
Surface treatment: Bright
Material: HSS High Speed Steel
Chamfer No: 1,2 and 3, Serail no 4 and 5
Flute Geometry: Straight Flutes