|Class of Fit:||6H|
|# of Flutes:||3|
|Size of Square:||0.489|
Recommended Hole Size based on 75% Thread: 17.500 mm
As to general physical dimensions, spiral point taps are identical with the standard hand tap. However, the spiral point tap has the cutting face of the first few threads cut at a predetermined angle relative to the tap's axis angle to force the evacuation of chips ahead of the cutting action. This feature, plus the excellent shearing action of the flute, make spiral pointed taps ideal for production tapping of through holes. Typically, this type of tap has a shallower flute passage than conventional taps. This gives the spiral point tap more cross-sectional area, which means greater strength, allows higher tapping speeds, and requires less power to drive. TiN (titanium nitride) coating is wear resistant and reduces friction, aiding in cutting edge retention. It has an ideal combination of hardness, toughness, adhesion and inertness. TiN coated taps often improve their lifetime by a factor of two to ten times, depending on the material being tapped.
These are reference values which depending on requirements and conditions, may need to be altered. NATC assumes no responsibility or liability of any kind as a result of utilizing these values.
Suggested Starting SFM/RPM: