What Disc for Cutting Steel, Stone & Tile — Angle Grinder Disc Guide (2026)

One of the most common workshop questions is simple: which disc do I need for this material? The wrong choice wastes time, damages your work, and creates safety risks. The right choice is fast, efficient, and safe.

This guide covers cutting steel, stone, concrete, tile, aluminium, plastic, and wood — with specific disc recommendations, technique tips, and cost guidance for UK tradespeople and DIYers.

Quick Reference Table: Disc by Material

Material	Disc Type	Common Size	Typical Speed	Key Technique Tips
Mild Steel (bar, tube, angle)	Metal cutting disc (1.0–1.6 mm)	125 mm or 230 mm	11,000–12,000 RPM	Steady pressure, let the disc do the work. Wear face shield.
Stainless Steel	Iron-free cutting disc (1.0–1.6 mm)	125 mm or 230 mm	11,000–12,000 RPM	Slower cut than mild steel, avoid contamination.
Rebar & Reinforced Concrete	Metal cutting disc	125 mm or 230 mm	11,000–12,000 RPM	Secure work, steady grip. Dust exposure risk.
Tile (ceramic/porcelain)	Continuous rim diamond disc	115 mm or 230 mm	9,000–11,000 RPM	Light pressure, wet cutting preferable. Avoid chipping.
Concrete & Brick	Segmented diamond disc	125 mm or 230 mm	10,000–11,000 RPM	Dry or wet cutting. Dust management critical.
Granite/Stone	Segmented diamond disc	125 mm or 230 mm	9,000–11,000 RPM	Wet cutting preferred. Slower cut than concrete.
Aluminium	Aluminium-specific cutting disc or carbide	125 mm or 230 mm	8,000–10,000 RPM (lower)	Light pressure, reduce RPM. Disc clogs easily.
Plastic & PVC	Fine-tooth cutting disc	125 mm	6,000–8,000 RPM (low)	Very light pressure. Avoid melting. Use dust mask.
Wood	NOT recommended for angle grinder	N/A	N/A	Use a proper circular saw or band saw instead.

Cutting Steel & Iron — Complete Guide

Mild Steel (Bar, Tube, Angle Iron, Box Section)

Mild steel is the most common metal cut with an angle grinder. Whether you’re cutting reinforcing bar on site, trimming exhaust tubing in the workshop, or cutting steel angle for a gate frame, the approach is the same.

The Right Disc: Metal Cutting Disc (1.0–1.6 mm)

A standard aluminium oxide metal cutting disc is the correct tool. Choose between:

• 1.0 mm thickness: Thinner, faster cuts, less kerf, generates less heat. Use for sheet metal, thin-walled tube, or precision cuts where minimal material loss matters.
• 1.6 mm thickness: Slightly thicker, more durable, better for rough site work and thick structural sections.

For general workshop use, 1.0 mm is adequate and faster. For sustained site cutting (especially structural steel and rebar), 1.6 mm offers better disc life.

Disc Sizes and Speed

125 mm discs: Standard for small angle grinders (up to 2.3 kW). Cut speed is slower, but control is easier. Ideal for precise, detailed work.

230 mm discs: For larger grinders (2.3 kW+). Much faster cutting, but requires more control and strength. Better for heavy site work.

Match the disc to your grinder — the nameplate specifies the correct size.

Technique for Clean, Fast Cuts

• Secure your workpiece. Use a vice or clamp. Never hold the work in your hand.
• Wear a face shield and gloves. Sparks are inevitable.
• Apply steady, moderate pressure. Let the disc do the work. Pressing too hard dulls the disc and risks binding (the disc jamming and kicking back).
• Support long sections. As you cut through, the piece may rotate or drop. Have a helper stabilise the workpiece.
• Mark your cut line clearly. Use a centre punch or marker to guide the disc.

Cut Time Expectations

A 125 mm metal cutting disc will typically cut through:

• 6 mm mild steel flat bar: 5–10 seconds
• 20 mm × 20 mm angle iron: 20–30 seconds
• Thick-walled steel tube (12 mm wall): 30–45 seconds

If cuts are taking significantly longer, the disc is dull and should be replaced.

Product Recommendation: Standard Metal Cutting Discs

Silverline 10-pack cutting discs (125 mm, 1.0 mm) — around £8–£10. Reliable, affordable, trusted by tradespeople.

Bosch Rapido cutting discs — premium option, slightly higher cost, longer life, widely available.

Cast Iron

Cast iron is harder and more brittle than mild steel. Use the same metal cutting disc, but:

• Reduce pressure slightly — cast iron is more prone to chipping.
• Expect disc wear to be faster than on mild steel.
• Wear respiratory protection — cast iron produces very fine dust.

Stainless Steel — Iron Contamination Risk

This is critical. If you cut stainless steel with a standard metal cutting disc (designed for mild steel), iron particles from the disc embed themselves into the stainless surface. This causes rust staining and surface corrosion — particularly problematic on visible stainless work like kitchen equipment, architectural panels, or medical equipment.

Solution: Use a dedicated iron-free stainless steel cutting disc.

These discs are formulated with an abrasive composition that doesn’t contaminate stainless. Cost is about 20–30% higher than standard discs, but it’s essential for stainless applications.

Product Recommendation: Silverline or Makita iron-free stainless cutting discs — around £1.50–£2.50 per disc.

Cutting Stone & Concrete — Diamond Discs

Why Not a Regular Cutting Disc?

A standard abrasive metal cutting disc won’t work on masonry. The stone is too hard — the abrasive grains wear away almost immediately, and cutting speed is impossibly slow. Stone and concrete require a different tool: a diamond cutting disc.

How Diamond Discs Work

Instead of abrasive grains, diamond discs have actual industrial diamonds embedded in a metal or resin matrix. As the disc spins, the diamonds engage the stone and fracture it away. Diamonds are harder than stone, so they maintain a cutting edge far longer than abrasive discs.

Diamond Disc Types

Rim Type	Best For	Cut Speed	Finish Quality
Continuous Rim	Tile, porcelain, natural stone	Slow but clean	Very smooth, minimal chipping
Segmented Rim	Concrete, brick, dense stone	Fast	Rougher edge
Turbo Rim (segmented + grooves)	All-rounder: concrete, brick, tile, stone	Good compromise	Good balance

For most workshop and site jobs, a turbo rim diamond disc is the best single choice — it handles concrete, brick, and tile reasonably well without requiring multiple discs.

Concrete & Brick Cutting

Disc choice: Segmented or turbo rim diamond disc.

Size: 125 mm or 230 mm, depending on grinder.

Cutting speed: Faster than tile, but slower than metal.

Technique:

• Concrete produces heavy dust — wear a dust mask or use wet cutting.
• Mark your cut line with chalk or a marker.
• Let the disc cut at its own pace; excessive pressure jams the disc.
• If cutting through rebar, the disc will handle it, but cutting speed reduces dramatically.

Wet vs Dry: Wet cutting (using a water supply) dramatically reduces dust and extends diamond life, but requires a wet-cut compatible grinder. For occasional cuts, dry cutting is acceptable with proper dust management (mask, ventilation).

Tile & Porcelain Cutting

Disc choice: Continuous rim diamond disc (essential for clean cuts and minimal chipping).

Why not segmented? A segmented disc is too aggressive for tile — it will chip and crack the brittle ceramic, leaving ugly ragged edges.

Size: 115 mm or 125 mm for handheld cuts; larger discs (230 mm) are sometimes used with wet saws for production work.

Cutting Technique for Tile

• Support the tile securely. Clamp it to a work table or hold it in a specialised tile cutter.
• Mark the cut line. Use a permanent marker or masking tape to guide the disc.
• Apply very light pressure. The disc does the work; you guide it. Heavy pressure causes chipping.
• Wet cutting is strongly recommended. Water cools the disc, reduces dust, and improves cut quality. If wet cutting, the disc must be rated for wet use (most are).
• Go slowly. Tile is brittle; patience produces clean cuts.

Porcelain vs Ceramic Tile

Porcelain is denser and harder than ceramic tile. Both cut with the same continuous diamond disc, but:

• Porcelain cuts slower and requires slightly more patience.
• Some manufacturers produce dedicated porcelain-specific blades with slightly different diamond composition, offering faster cutting on very hard tiles.
• For standard workshop use, a quality continuous diamond disc handles both.

Avoiding Chipping and Cracks

The biggest complaint with angle grinder tile cutting is chipping at the edges. To minimise this:

• Use a continuous rim disc (not segmented). This is non-negotiable for tile.
• Cut slowly with light pressure. Speed is the enemy with brittle materials.
• Support the tile properly. A loose tile flexes and cracks more easily.
• Cut from the glazed side if possible. Unglazed sides are slightly more prone to chipping.
• Consider a wet tile saw for critical cuts. If chipping is a recurring problem and you’re doing a lot of tile, a dedicated wet saw (£150–£400) produces much cleaner cuts than an angle grinder.

Stone (Granite, Marble, Natural Stone)

Disc choice: Continuous or turbo rim diamond disc.

Key consideration: Natural stone is variable. Granite is very hard; marble is softer. Some stones are more prone to chipping than others.

Technique: Similar to tile — light pressure, wet cutting preferred, go slowly. Natural stone is often more expensive than tile, so take extra care to avoid damage.

Product Recommendations: Diamond Discs

All-purpose turbo diamond disc: Silverline or Faithfull turbo diamond discs (125 mm) — around £8–£15, good general-purpose choice.

Tile-specific continuous rim: DPC or Makita continuous diamond tile discs — around £12–£20, best for tile work.

Cutting Aluminium — Special Considerations

Why Aluminium Is Different

Aluminium is soft and conducts heat well. When you cut it with a standard metal cutting disc, aluminium particles clog the disc’s pores rapidly. The disc loses sharpness within seconds and cutting speed plummets. You end up with a burned, melted edge and a ruined disc.

The Solution: Dedicated Aluminium Discs or Carbide-Tipped

Option 1: Aluminium-specific cutting discs — Designed with wider spacing and softer bonds to prevent clogging. Cost similar to standard discs.

Option 2: Carbide-tipped cutting discs — More aggressive, last longer, cost more (around double), but provide better results on aluminium.

Technique for Cutting Aluminium

• Reduce grinder speed if possible. Most angle grinders run at 11,000+ RPM. If your grinder has a speed control, reduce to 8,000–10,000 RPM for aluminium.
• Use very light pressure. Let the disc cut; don’t force it.
• Allow the disc to cool. Aluminium generates heat; frequent breaks help.
• Replace the disc frequently. Once it starts clogging, it won’t recover — fit a fresh disc.

Product Recommendation

Silverline or Makita aluminium-specific cutting discs — around £1.50–£2.50 per disc. Worth the investment if you cut aluminium regularly.

Cutting Plastic & PVC

The Challenge

Plastic and PVC are thermoplastic — they melt under heat. A standard metal cutting disc generates too much heat and melts the plastic rather than cutting it cleanly, leaving a fused, melted edge.

Solution: Fine-Tooth Cutting Discs

Specialised plastic cutting discs have finer abrasive spacing and are designed to cut with minimal heat generation. Technique is critical:

• Reduce grinder speed to 6,000–8,000 RPM. This is essential — high speed generates excessive heat.
• Apply very light pressure. Almost no pressure; let the disc do the minimal work.
• Work slowly. Accept that plastic cutting is slow compared to metal or stone.
• Allow cooling breaks. The plastic will start to melt if the disc gets too hot.
• Wear a dust mask. Melted plastic fumes are not pleasant.

Important Safety Note

Never use a high-speed metal cutting disc on plastic — the heat generated will melt the plastic and potentially cause kickback. If your grinder doesn’t have speed control and runs only at high RPM, consider using a different tool (jigsaw, hacksaw, or band saw) for plastic work.

Cutting Wood — NOT Recommended

Why Not?

Angle grinders are not designed for wood. Here’s why this is genuinely dangerous:

• Kickback risk: Wood is soft and will bind on the disc if grain alignment or knots are encountered. This causes sudden, violent kickback that can break wrists or arms.
• Disc shattering: High-speed grinding discs shatter if subject to the unpredictable binding forces from wood.
• No control: Unlike a circular saw (which is designed for wood with guards and brake systems), an angle grinder offers no protection.
• Specialised wood-cutting attachments exist (chainsaw-carving discs), but these are extremely high-risk and should only be used by experienced professionals with full PPE and training.

The Right Tools for Wood

Use the correct tool:

• Circular saw: For straight cuts on boards.
• Band saw or jigsaw: For curved cuts.
• Hand tools (saw, chisel): For fine detail work.

These tools are designed for wood, include safety features, and produce better results with less risk.

Complete Material Comparison Table

Material	Disc Type	Typical Cost per Disc	Cut Speed	Finish Quality	Safety Considerations
Mild Steel	Metal cutting (1.0–1.6 mm)	£0.80–£2.00	Very fast	Clean edge	Spark management, secure workpiece
Stainless Steel	Iron-free cutting (1.0–1.6 mm)	£1.20–£2.50	Moderate	Very clean, no contamination	Disc can bind; secure work
Cast Iron	Metal cutting (1.0–1.6 mm)	£0.80–£2.00	Moderate (slower than steel)	Clean edge	Fine dust (respiratory), secure work
Concrete	Segmented or turbo diamond	£8–£15	Moderate	Rough edge (expected)	Heavy dust (use mask), water spray option
Tile (ceramic)	Continuous rim diamond	£12–£20	Slow	Very smooth, minimal chipping (if done correctly)	Light pressure essential, wet cutting preferred
Granite/Stone	Continuous or turbo diamond	£10–£20	Slow	Very smooth	Wet cutting preferred, fine dust
Aluminium	Aluminium-specific disc or carbide	£1.50–£3.50	Moderate (heat management critical)	Clean edge if correct disc used	Heat generation, disc clogging, use light pressure
Plastic/PVC	Fine-tooth plastic cutting	£2.00–£3.50	Very slow (controlled)	Acceptable if done carefully	MUST reduce speed to 6,000–8,000 RPM, light pressure, heat risk
Wood	NOT RECOMMENDED — use a circular saw	N/A	N/A	N/A	Very high kickback risk, disc shattering risk. Use proper woodworking tools instead.

Watch: Video Guide

FAQ: Disc Selection by Material

Practical Toolkit Recommendation

If you’re building a toolkit for a home workshop or small site, here’s what you actually need:

• Metal cutting discs (1.0–1.6 mm), 10-pack: £8–£12. Standard steel cutting for 90% of jobs.
• Turbo diamond disc (125 mm): £10–£15. Covers concrete, brick, and tile in a pinch (not perfect for any, but acceptable for all).
• Flap disc assortment (60 & 80 grit), 8-pack: £12–£18. Grinding, weld cleanup, rust removal, finishing.

Total cost: £30–£45. With these three types, you can tackle cutting and grinding on almost any material a typical tradesperson or DIYer will encounter.

If you specialise in specific materials:

• Lots of tile work? Add continuous rim diamond discs (£12–£20 each).
• Cutting stainless regularly? Add iron-free stainless cutting discs (£1.50–£2.50 each).
• Cutting aluminium? Add dedicated aluminium discs (£1.50–£3.50 each).

Final Safety Reminders

• Always match the disc to the material. Using the wrong disc is the root cause of most angle grinder accidents.
• Inspect the disc before fitting. Discard any disc with visible cracks, missing chunks, or damage.
• Secure your workpiece. Never try to hold it by hand. Use a vice, clamp, or specialist holder.
• Wear appropriate PPE: Face shield (not just goggles), gloves, dust mask (especially for stone, concrete, and wood dust), and hearing protection.
• Know your grinder’s specifications. Maximum RPM, maximum disc size, and whether it’s rated for wet cutting. Check the manual.
• Never reduce pressure or speed below recommended minimums to hurry the job. Low speed with certain discs (especially cutting discs) can cause disc breakage.