Spiral Flute Machine Taps

Material - HSS 

Thread - Metric Coarse Standard (Most common)

Sizes - 

M2 X 0.4
M2.5 X 0.45
M3 X 0.5
M3.5 X 0.6
M4 X 0.7
M5 X 0.8
M6 X 1
M8 X 1.25
M10 X 1.5
M12 X 1.75
M14 X 2
M16 X 2
M18 X 2.5
M20 X 2.5
M24 X 3 

To M24

Spiral fluted taps have flutes that wrap around the taps axis in a spiral or a helical configuration.

The tap is used mainly for tapping blind holes. 

A spiral fluted tap pulls the chips (swarf) out of the hole towards the top shank and apposite of the tapping direction. 

This helps the tap last longer unlike hand taps and also no need for the starter taper tap or second tap.

UK Made so expect the best quality