Hand Taps - Fractional
General purpose taps can be used by hand or under power, in through (open both ends) or blind holes (closed one end)
Suitable for tapping most materials.
Taper taps (7 to 10 threads) Longest chamfer insures easier starting
Plug taps (3 to 5 threads) Most common chamfer Used in through or blind holes
Bottoming taps (1 to 2 threads) Used for threading close to the bottom of a blind hole