Technique
Zero-Gapping A Trimmer Safely: A Step-By-Step Routine
A careful alignment routine for trimmer blades, plus the warning signs that a blade is set too close for safe skin work.
Barber Selective Editorial · Published 2026-07-28 · Updated 2026-09-26 · 5 min read
Before you start
Zero-gapping means adjusting the moving cutter so its teeth sit very close to the edge of the stationary blade. Adjusting a blade can void some manufacturer warranties, so check your tool's warranty terms first. Unplug or power off the trimmer and work on a clean, well-lit surface.
The alignment routine
Loosen the blade screws just enough for the cutter to move. Set the cutter teeth slightly behind the stationary blade teeth, keep the two blades parallel, then tighten the screws evenly.
Power on and listen: rattling or grinding means the blades are not seated correctly. Oil the blade per the manufacturer's directions before use.
Signs the blade is too close
If the cutter teeth sit level with or beyond the stationary teeth, the blade can cut or irritate skin. Back it off. When in doubt, a slightly wider gap is the safer choice, and many trimmers are sold already set close from the factory.
Independent editorial from Barber Selective. Not sponsored and not endorsed by any manufacturer. Always follow the manufacturer's instructions for your tool.