How do I choose an angle grinder for automotive work?
Short answer: Match disc size and power source to the job: compact 4.5 to 5 inch grinders cover most cutting, grinding and rust removal, with cordless for portability and air where a good compressor is available.
Angle grinders cut exhaust parts, remove rust and welds, and prepare metal for repair. Most automotive work uses 4.5 or 5 inch discs, which balance control and reach.
Cordless grinders are portable and quick to set up. Air grinders are light and durable if the shop has enough air supply. Corded grinders give steady power for long jobs.
Look for a guard that adjusts without tools, a side handle, and safety features such as paddle switches or electronic brakes where offered. Always use discs rated for the grinder's speed, keep the guard on, and wear safety glasses, a face shield, gloves and hearing protection. Keep sparks away from fuel and flammable materials, and have a fire extinguisher nearby.
Tools used for this job
General guidance only. Follow the vehicle and tool manufacturer's procedures, and confirm vehicle coverage on the tool maker's list before buying.