How to choose an angle grinder and the right disc
The angle grinder is the most versatile tool in a fabrication or maintenance shop — and the disc matters as much as the machine.
Disc size
- 100–115 mm: small and light, good for detail work and tight spaces
- 125 mm: the most popular size — a good balance of power and control
- 180–230 mm: heavier machines for cutting thick material and big grinding jobs
Power and speed
More power helps when you work for long periods or with thick steel. Check the maximum speed (rpm) printed on any disc: it must be equal to or higher than the speed of the grinder, or the disc can break.
Pick the right disc
- Cutting disc: thin, for cutting metal or stone — never use it for grinding on its side
- Grinding disc: thicker, for removing material and shaping welds
- Flap disc: for blending and finishing after grinding
- Wire brush or wheel: for removing rust, paint and scale
- Diamond blade: for cutting masonry, tile and concrete
Use it safely
- Always keep the guard in place and use the side handle
- Wear eye or face protection, gloves and hearing protection
- Secure the work piece so it cannot move
- Let the grinder reach full speed before it touches the work, and never force it
Features that help
Look for a safe-to-use switch you can release quickly, a soft start that stops the machine jerking, restart protection after a power cut, and vibration reduction if you use the tool for long periods.