DIY guide · Angle grinder discs

Which angle grinder disc? A DIY guide to choosing the right one

Last updated: 11 November 2026

An angle grinder cuts rebar, paving stones and tiles, strips rust and smooths welds, but every job needs a different disc. The wrong disc works poorly and, above all, can be dangerous.

Based on Tyrolit catalogues, this guide shows which disc to choose and how to work safely. Galflex is an authorized Tyrolit distributor in Romania.

Key takeaways

Choose the disc by job: a cutting disc for metal, a diamond blade for stone and ceramics, a flap or grinding disc for rust and welds.
The disc diameter must match the grinder, and the maximum speed printed on the disc must be at least the grinder’s speed.
Never grind with the side of a cutting disc.
Work with the guard fitted, both hands on the machine, and wear safety glasses, ear protection, gloves and a dust mask.

Which disc for which job

Start from the job, not from the disc in the drawer.

On Tyrolit cutting discs the label colour shows the material: blue for steel and 2in1, red for stainless steel, orange for non-ferrous metals, violet for cast iron and green for stone.

Job and suitable angle grinder disc
Job	Suitable disc	Selection tip
Cutting rebar, profiles, pipes, steel sheet	Steel cutting disc (shape 41 or 42)	1.0–1.9 mm for fast cuts with minimal burr; 2.0–3.0 mm for life and stability
Cutting stainless sheet or tube	INOX or 2in1 steel and stainless cutting disc	According to Tyrolit, the disc’s chemical purity prevents corrosion and rust spots
Cutting paving stones, brick, aerated concrete	Universal or hard stone diamond blade	For granite pavers, the hard stone blade
Cutting tiles	Continuous rim diamond blade	The closed rim gives clean edges
Removing rust and paint	Flap disc	Grit 40/60 removes fast, 80/120 finishes; zirconia (ZA) on stainless
Smoothing welds	Shape 27 grinding disc, then a flap disc	6–7 mm for roughing, then a flap disc 80/120 to finish

Match the disc to the grinder: size and speed

Small grinders take 115 or 125 mm discs, large ones 230 mm, with a 22.23 mm bore on Tyrolit discs. Fit only the diameter your grinder and guard are built for.

The maximum speed is printed on every disc with standard markings; for example, the label of a 125 mm Tyrolit disc reads “Max. 12.250/min, Max. 80 m/s” (12,250 rpm). The grinder’s rated speed must not exceed it, and checking this is the user’s responsibility. Before fitting, check:

The disc diameter matches the grinder and the guard.
The disc’s maximum speed is at least the grinder’s speed.
The expiry date (month and year) has not passed.
The disc has not been dropped, is not chipped and has not been stored in damp conditions.
After fitting, run the grinder idle for at least one minute with the guard secured and yourself out of line with the disc.

Never use a cutting disc for side grinding

The classic beginner’s mistake is to smooth a weld with the face of a cutting disc. Cutting discs (shape 41, flat, and 42, depressed centre) are thin and built for load on the edge; side pressure can break them while spinning. Tyrolit’s rule is unambiguous: never side-grind with a shape 41 or 42 cutting disc.

For grinding, use a shape 27 grinding disc or a flap disc. If you want one disc for both, Tyrolit’s CUT AND GRIND shape 27 disc is designed to cut and grind. A flap disc, in turn, must not be used on its edge, as the flaps can come off.

Follow the pictograms on the disc

The “side grinding not permitted” pictogram means the disc is for cutting only. Label pictograms are safety instructions, not suggestions.

Cutting paving stones, brick and tiles

For stone, concrete and ceramics use a diamond blade, not a metal cutting disc. Tyrolit diamond blades for angle grinders are for dry cutting, and the label colour shows the material, for example yellow for universal building materials, blue for hard stone and green for tiles.

Cut thick material in passes of 2–5 cm, without forcing, with cooling breaks. Clamp the pieces and support large slabs on both sides of the cut so the blade cannot pinch.

Dust from concrete, brick, stone and ceramics contains respirable crystalline silica. Directive (EU) 2017/2398 added “work involving exposure to respirable crystalline silica dust generated by a work process” to Annex I of Directive 2004/37/EC on carcinogens or mutagens at work, with a binding limit value of 0.1 mg/m³ (respirable fraction, 8-hour reference period). The risk comes from the material and the process, not the disc brand: work preferably outdoors and with on-tool extraction, use water where the blade and machine allow it, and wear an FFP2 or FFP3 mask.

Safe working steps with an angle grinder

Follow the same order for every job, however short:

Unplug the grinder or remove the battery before changing the disc.
Never fit toothed wood-cutting blades, saw chains or any improvised blade to an angle grinder.
Use the machine’s flanges, clean and undamaged, and do not overtighten the nut.
Work only with the guard fitted and positioned so that sparks are directed away from your body.
Hold the grinder with both hands, using the side handle, in a stable stance.
Clamp the workpiece in a vice or with clamps; never hold it in your hand.
Start the grinder clear of the workpiece and only engage once the disc is up to speed.
Keep your body out of line with the disc and out of the path the grinder would take in a kickback; do not twist or tilt the disc in the cut, and if it jams, switch off immediately.
Do not force the disc, and let it stop on its own without braking it.
Wear safety glasses, ear protection, gloves, a dust mask and, for longer jobs, a leather apron; keep flammables away from sparks.

Standard-marked discs and the Tyrolit ONE range

Tyrolit cutting and grinding discs are made to EN 12413, flap discs to EN 13743 and diamond blades to EN 13236. Tyrolit is a founding member of oSa (Organisation for the Safety of Abrasives).

For metal, Tyrolit describes its ONE range as an “attractive starter offer for DIY enthusiasts and professional users”. All ONE products are 2in1, for steel and stainless steel: cutting discs, 6 mm grinding discs and flap discs in grits 40/60 or 80/120. For stone and ceramics you still need a diamond blade.

Tyrolit disc marked EN 12413 and oSa, or a no-name disc?

A disc without standard markings does not tell you its maximum speed, expiry date or specification, and a disc that bursts at operating speed can cause serious injury. Tyrolit guarantees that its tools meet the requirements of oSa and the European standards, and the disc’s specification (grain, grit, hardness, bond, reinforcement) is printed on the label: you know what you are fitting to your grinder.

Frequently asked questions

Which angle grinder disc should I use for rebar?

A steel cutting disc, shape 41 or 42, with a blue label (steel or 2in1). Choose 1.0–1.9 mm for fast cuts or 2.0–3.0 mm for durability, and clamp the bar so it cannot turn.

Can I cut tiles with an angle grinder?

Yes, with a continuous rim diamond blade for ceramics, with a green label. Cut with extraction and wear a mask: ceramic dust contains crystalline silica.

Can I fit a 230 mm disc on a 125 mm grinder?

No. The large disc would not be covered by the guard, and at a small grinder’s speed its rim would far exceed the permitted peripheral speed. Removing the guard to fit it is extremely dangerous.

Which disc removes rust and paint?

A flap disc: grit 40/60 for fast removal, then 80/120 to finish. On stainless steel choose zirconia (ZA) flaps. Work with the face of the disc, not the edge.

Do angle grinder discs expire?

Yes. Cutting and grinding discs carry an expiry date printed as month and year, usually on the metal ring around the hole. Do not use them after that date, and store them dry, away from large temperature swings.

Fit your grinder with the right disc

Galflex is an authorized Tyrolit distributor in Romania. See the Tyrolit cutting, grinding, flap and diamond discs, or tell us your job and grinder and we will recommend a disc.

See the Tyrolit angle grinder discs · Contact us for an offer

Sources and documentation

Related guides

Cutting disc vs grinding disc vs flap disc: which one for which job
What each angle grinder disc does, the right working angle and which one to use for cutting, weld seams, rust, bevelling and finishing.
Angle grinder and abrasive disc safety: a practical guide
Why discs made to EN 12413 with the oSa mark matter, how to store, inspect and mount them, which PPE to wear and how to control crystalline silica dust. With a pre-work safety checklist.
How to choose a diamond blade for concrete, stone, tiles and asphalt
Which diamond blade to use on concrete, reinforced concrete, granite, tiles or asphalt: rim types, dry vs wet cutting and protection against silica dust.