Thread surface not according to requirements

Thread surface not according to requirements
Possible causes Solution
burrs remove burrs
cutting edge geometry (chamfer lead, rake-, chamfer-, spiral point angle) not retained - observe technical specifications when regrinding.
- observe regrinding instruction
peak-to-valley height of the reground tap too large - regrind again or apply new tool.
- observe max. regrinding limits.
cold welding at the flanks remove cold welding marks