Thread produced is too large
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| Possible causes | Solution |
| incorrect tap, tap geometry not suitable or the application | apply correct tap for the material to be machined |
| tapping size hole too small | observe tapping size hole table in the technical section. Note different tapping size hole diameters for fluteless taps. |
| alignment error of tapping size hole or position | - check for correct tool clamping - apply floating tap holder - check core drill |
| machine spindle axially restricted | - use mechanical feed - apply tension/compression tap chuck |
| cold welding at the flank of the tap | - apply new tap - apply coated tap - optimise lubrication |
| lead of tap unsatisfactory due to insufficient thread depth | - tap with forced feed - apply tap with modified lead |
| cutting speed too high | - reduce cutting speed - improve lubrication |
| lubrication or coolant supply insufficient | ensure sufficient and suitable coolant supply and check concentration |
| tolerance specification on tap does not correspond to specifications on drawing and/or thread gauge | apply correct tap for required tolerances |