| application | symptom | common cause | remedy |
| gage out of limits | tap size and gage mismatch | select tap size for gage |
| oversize thread | alignment, spindle feed | correct |
| oversize at top | runout or alignment | correct |
| go gage binds part way | worn tool, tap cuts off lead | replace tap, synchronous holder |
| general | thread shaving | feed error, high axial force | programme, synchronous holder |
| chipping | high cutting force, worn tap | tap geometry, replace tap |
| breakage | chip jamming flutes | tap geometry, tapping depth |
| — | worn tool, high torque | replace tap with new tool |
| short life, low speed | excessive wear | SC or HSS-E-PM HP taps |
| birdnest blind hole | long, ductile chips | GT30 GP6505 (oxide), peck feed |
| steel | chipping | high material hardness | GT00, GT02 WP31MG (TiN) |
| breakage in blind holes | hole depth >2D, chip jamming | GT04 WH36MG (TiN/MoS2) |
| til tl | oversize thread, low life | galling | GT20, GT30 GM6515 (TiN-CrC/C) |
| saness see | short life | work hardened core hole | replace drill |
| cast iron | excessive wear | abrasion | GT40 GP6520 (TiCN) |
| aluminium, cast | excessive wear | high silicon | GT40 GP6520 (TiCN) |
| aluminium, wrought | oversize thread | galling | GT70, GT80 WN48EG (DLC) |
| nickel, cobalt alloys | short life | high cutting temperature | GT10, GT12 WS32MG (TiCN) |
| titanium | short life | high cutting temperature | GT14, GT16 WN35MG (TiN-DLC) |
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