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Grinding disc vs cutting disc

Updated: 21 October 2026

You have a 125 mm angle grinder and two discs that look similar until you look at the edge. One is about 6 mm thick and is meant to grind on its face. The other is about 1–3 mm thick and is meant to cut on its edge. Mixing them up is how a cutting disc gets a side load, and how a grinding disc gets forced into a slot it will bind in. This page is that choice. The four grinding packs we kept are on the [125mm grinding discs](/hub/sanders/125mm-grinding-discs) comparison. Products Compared used UK trade guides and a UK grinder manual, dated 19 October 2026. A qualifying purchase can earn a commission at no extra cost to you.

You have a 125 mm angle grinder and two discs that look similar until you look at the edge. One is about 6 mm thick and is meant to grind on its face. The other is about 1–3 mm thick and is meant to cut on its edge.

Our top picks

Parweld Parweld GS1260 grinding discs (10)

Best overall

Parweld Parweld GS1260 grinding discs (10)
8.6/10about £11.30
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Merryland Merryland E31086043 grinding wheels (10)

Rank 2

Merryland Merryland E31086043 grinding wheels (10)
3.7/10about £17.90
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Tyrolit Tyrolit BASIC 222860 grinding discs (10)

Rank 3

Tyrolit Tyrolit BASIC 222860 grinding discs (10)
6.6/10about £18.00
View offer
On this page
  1. 1.Two discs, two jobs
  2. 2.Side load on a thin disc
  3. 3.A grinding disc is the wrong saw
  4. 4.When the title says both

Two discs, two jobs

A grinding disc for this grinder is a depressed-centre wheel, about 125 x 6 x 22.23 mm. You hold it at a shallow angle so the face dresses a weld, a burr, or a high spot. Cutwel puts grinding discs around 6–8 mm and a working angle around 15–30 degrees. Tyrolit’s GB page for article 222860 calls 6 mm the thickness for rough grinding and lists that article as form 27. A cutting disc, often called a cut-off wheel, is about 1–3 mm in the same trade guides. You present the edge, with the cutting guard fitted, and you do not lean the face into the metal. The bore can be the same 22.23 mm, which is why the discs fit the same spindle and why the thickness is the check that matters. If you are dressing a weld bead flat, you want the 6 mm disc. If you are parting box section or cutting a slot through bar, you want the thin disc and the cutting guard. Diameter, bore, grit, and the date on the ring sit on the buying guide. The steps for fitting that wheel are on how to use a 125mm grinding disc.

Side load on a thin disc

A cutting disc is built to take load through the edge. Side pressure, the ordinary way you grind, asks the thin bond to bend. Cutwel and the DH & JS page both say a cutting disc is not built for that side load, and that the failure can be a shattered disc. The guard for cutting is not the grinding guard. Black & Decker’s UK manual treats them as different parts, and it tells you not to run the tool with the guard off. The outer flange also faces the other way for cutting on that manual. Copy the figure in your own grinder’s book if it differs. A quick skim with a 1 mm disc is still a side load.
Parweld Parweld GS1260 grinding discs (10)

Testsieger

Parweld Parweld GS1260 grinding discs (10)
8.6/10about £11.30
View offer

A grinding disc is the wrong saw

A 6 mm grinding disc is the wrong saw. The face is wide, so it rubs in a cut, heats the bond, and can grab. Forcing it through bar to save a disc change is how the wheel binds. You change discs, you change the guard, and you change the flange to the cutting position your manual shows. Sparks and noise will not tell you which disc is fitted once the tool is running. Look at the thickness before the plug goes back in, or before the battery goes on. A disc that only fits if the guard comes off is discarded for that grinder.

When the title says both

Amazon titles in this search mix the words. Tyrolit BASIC article 222860 is sold with a title that says rough grinding wheels and also says 125 mm cutting discs. The same title gives 125 x 6 x 22.23 mm. Tyrolit’s own GB page lists 222860 as a form 27 rough grinding wheel, A 30 Q-BF, and it does not describe that article as a 1 mm cut-off wheel. On these Tyrolit titles, 2-in-1 means steel and stainless, not cutting plus grinding. The practical check is the disc in the packet. About 6 mm, depressed centre, is the grinding wheel that page is selling, whatever the extra words in the title. About 1 mm is a cutting disc, and it does not become a grinding disc because the search term was grinding. Merryland’s grinding-wheel listing carries a 4.6 from 1,074 reviews, and many of those reviews describe cutting. How those four packs compare, once you know you want the thick wheel, is on best 125mm grinding discs.

Common questions

Can I skim with a cutting disc?
A light skim is still side load on a disc that is about 1 mm thick. Those trade pages say a cutting disc is not built for side load, and the failure they describe is a shattered wheel.
Can I cut a slot with a 6 mm grinding disc?
A 6 mm wheel binds if you try to saw with it. The face is too wide for a parting cut. Change to a cutting disc, fit the cutting guard, and set the flange the way your manual shows for cutting. Forcing the grinding disc through the bar is the swap this page is warning you off.
Do they use the same guard?
No. Black & Decker’s UK CD115-class manual uses a grinding guard for grinding and a cutting guard for cutting, and it says not to remove the guard. The outer flange direction also changes between those two jobs on that manual. Follow your own grinder’s figure if it is different.
Why does a grinding-wheel title say cutting discs?
Tyrolit BASIC 222860’s amazon.co.uk title contains both phrases. The dimensions in that title are 125 x 6 x 22.23 mm, the bullets say shape 27, and the GB product page lists the article as a rough grinding wheel.
Where do flap discs fit?
A flap disc is layered abrasive on a backing plate, for blending and finishing, and it is neither the 6 mm grinding wheel nor the thin cutting disc. This comparison does not tell you how to fit one. If the packet says flap, it is a different category from the packs on the main page.

Related pages

125mm metal cutting disc

125mm grinding discs

Best 125mm grinding discs: Parweld for mild-steel welds

What to check on a 125mm grinding disc before you buy

How to use a 125mm grinding disc on an angle grinder

Grinding disc for stainless steel: what the title says

Sources

Sources taken from the research digest. Listings were checked on 19.10.2026.

  1. HSE — PUWER overview (retrieved 19.10.2026)
  2. HSE — Training and competence (retrieved 19.10.2026)
  3. HSE — HSG17 Safety in the use of abrasive wheels (retrieved 19.10.2026)
  4. oSa — EN 12413 marking note (retrieved 19.10.2026)
  5. Tyrolit GB — BASIC 2in1 rough grinding wheels (retrieved 19.10.2026)
  6. LUKAS — speed table via Kammarton (retrieved 19.10.2026)
  7. Cutwel — guide to grinding discs (retrieved 19.10.2026)