Which Grinding Wheel for Angle Grinder Work

A grinding wheel is a thick, reinforced abrasive disc made to take metal off with the face of the wheel: weld beads, sharp edges, burrs, rust and mill scale. It is not the same thing as a cut-off wheel. A cut-off wheel is thin and only cuts with its edge. Below is how to choose the right one for your grinder and your job, with the exact wheels we stock.

Which grinding wheel should I use on an angle grinder?

The grinding wheel to use on an angle grinder depends on what you are grinding and how much needs to come off. This table matches each job to the wheel we stock for it.

Prices per wheel, checked against our catalog Oct 21, 2026. Walter wheels are made by Walter Surface Technologies; cup wheels by ITM.

[First-hand line from David, to be supplied and approved. Suggested question: "When a customer calls asking for 'a grinding disc,' what do you ask them first, and what do most crews end up ordering?"]

— David Castro, Eldorado Tools

What are the types of grinding wheels?

The types of grinding wheels for angle grinders are numbered by shape. A Type 27 grinding wheel, also called a depressed center grinding wheel, is the one most people mean. Here are the shapes you will meet on an angle grinder:

Type 27 working angle per Walter's catalog; Type 28 range per Weiler and Benchmark Abrasives. Always use the guard made for the wheel type.

1/8 in. or 1/4 in. grinding wheel?

Use a 1/4 in. grinding wheel for heavy stock removal and a 1/8 in. wheel for lighter grinding, fillets and tight spots. The thicker wheel lasts longer and takes more side pressure. The thinner wheel is lighter, cuts a narrower path and reaches into roots and corners. For pipe, PIPEFITTER also comes in 3/32 in. (08N453, $6.08) for root passes and 5/32 in. (08N454, $6.51) for cap passes.

Which grinding wheel fits my angle grinder?

A grinding wheel fits your angle grinder when three things match: diameter, arbor and speed. If you just bought a grinder, check these first.

• Diameter: use the size printed on the grinder and its guard. Never put a bigger wheel on a smaller grinder, because the guard won't cover it and the wheel may not be rated for the speed.
• Arbor: most 4-1/2 to 9 in. grinders in North America have a 5/8-11 threaded spindle. A 7/8 in. hole wheel goes on over the inner flange and is held by the lock nut. A 5/8-11 hubbed wheel screws straight on. Both fit the same grinder.
• Speed: the wheel's max RPM must be at least the grinder's no-load RPM.

Grinder speeds from Bosch spec sheets (1375-01, 1703AEVS, 1873-8, 1893-6); the 6 in. row is a typical range, not one model. Wheel speeds are Walter's ratings. Your grinder's own label wins.

Which grinding wheel is safe on stainless steel?

A grinding wheel is safe on stainless steel when it contains no iron, sulfur or chlorine, which leave rust spots on the finished part. Walter makes PIPEFITTER to that standard for grinding welds between passes on pipe, and rates HP XX for steel and stainless steel. Keep separate, marked wheels for stainless. A wheel that has touched carbon steel carries iron onto the next stainless part. Data center crews on liquid-cooling lines should treat this as a rule, not a tip.

What grinding wheel do I use on concrete?

Use a diamond cup wheel, not an abrasive grinding wheel, to grind concrete with an angle grinder. Abrasive wheels wear away fast on concrete. A diamond cup wheel knocks off high spots and form lines, removes laitance, and takes a wall back to sound concrete before carbon-fiber straps, epoxy or a coating go on. Our GCW-50 is a 5 in., 16-segment cup with a 7/8 in. arbor at $83.06, and GCW-50T is the same wheel with a 5/8-11 hub at $85.27. For 7 in. grinders, see GCW-70 at $110.45. To strip paint, mastic or coatings, use a PCD cup wheel such as PCD-50 ($85.18).

Dust: dry grinding concrete releases respirable crystalline silica. Use a dust shroud on a HEPA extractor, or grind wet, plus the respirator your silica plan calls for. The rest of the wall-repair kit is in our foundation repair tools guide.

Grinding wheel or flap disc?

A grinding wheel removes metal faster, and a flap disc grinds and finishes in one pass with a smoother surface. On heavy beads, start with the wheel and blend with a flap disc such as 15Y456 (4-1/2 in., 60 grit, $6.00 a disc). For light cleanup, the flap disc alone is often enough.

Our grinding wheels and prices

These are the grinding wheels we stock for angle grinders, priced per wheel, from Walter Surface Technologies and ITM.

Walter calls HP XX its longest-lasting grinding wheel. Earlier stock under the same part numbers is labelled ALLSTEEL XX, and it is the same wheel. See every size and thickness in our grinding wheels collection.

Prices checked against our catalog on Oct 21, 2026.

Why does my grinding wheel glaze, wear out fast or vibrate?

Heat ruins wheels the same way it ruins drill bits; our drill speed chart explains why.

Not sure which wheel to pick? Call our team at (833) 4-ETOOLS or email sales@eldoradotools.com with your grinder's size and the job.

Prices checked against our catalog on Oct 21, 2026.