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Threading

Tapping troubleshooting

Oversized thread
 
Cause
 
Solution
 
  • Wrong tolerance
  • Wrong tap for application
  • Incorrect axial feed
  • Tap speed too slow
  • Wrong tool holder “over feed thread”​
  • Choose tap with lower tolerance
  • Refer to application charts
  • Ensure feed rate is controlled
Undersized thread
 
Cause
 
Solution
 
  • Wrong tolerance
  • Tap worn out
  • Excessive pull off pressure
  • Tap drill hole too small
  • Material closing in after tapping
  • Choose tap with higher tolerance
  • Replace
  • Adjust tapping attachment
  • Increase drill diameter
Chipping
 
Cause
 
Solution
 
  • Wrong tap for the material/application
  • Incorrect or lack of lubricant
  • Tap hitting bottom of hole
  • Trapped chip
  • Surface hardening in drilled hole
  • Check tool selection
  • Use appropriate emulsion or oil
  • Increase drill depth or reduce thread depth
  • Check tool selection
  • Check drilling recommendations
Breakage
 
Cause
 
Solution
 
  • Too high torque
  • Tap worn out
  • Incorrect or lack of lubricant
  • Tap hitting bottom of hole
  • Tap speed too high
  • Trapped chip
  • Tap drill hole too small
  • Use tap holder with torque settings
  • Replace
  • Use appropriate emulsion or oil
  • Increase drill depth or reduce thread depth
  • Lower cutting speed, see recommendations
  • Check tool selection
Rapid wear
 
Cause
 
Solution
 
  • Wrong type of tap for the application
  • Wrong surface treatment
  • Incorrect or lack of lubricant
  • Tap speed too high
  • Surface hardening in drilled hole
  • Tap drill hole too small
  • Use a more wear resistant surface treatment
  • Use appropriate emulsion or oil
  • Lower the cutting speed, see recommendations
  • Check drilling recommendations
Built-up edge (BUE)
 
Cause
 
Solution
 
  • Wrong type of tap for the application
  • Tap worn out
  • Incorrect or lack of lubricant
  • Replace
  • Use appropriate emulsion or oil
 
 
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