5 Inch Cutting Disc (125mm): Uses, Specs & Advantages

Aug 17,2026

Bill Saint-Gobain

A 5 inch cutting disc (125 mm) mounts on 5" angle grinders and provides noticeably more cutting depth than a 4.5 inch disc while remaining compact and easy to control. It is a favorite among professional fabricators who cut thicker pipe and profiles but still want a light, agile tool.

Main Uses of a 5 Inch Cutting Disc

Cutting medium-wall steel and stainless pipe up to ~35 mm depth
Fabrication shop work: angle iron, channel, box section
Installation work where a 4.5" disc cannot finish the cut in one pass
Metal roofing, fencing and frame construction

Advantages Over Smaller Discs

More depth: ~35 mm cutting depth vs ~25 mm on 4.5", so many workpieces are cut in a single pass.
Longer service life: larger diameter means more abrasive material — more cuts per disc.
Efficiency: at 12,230 RPM and 80 m/s, cutting speed remains high.
Same thin-kerf options: available from 1.0 mm ultra-thin INOX to 2.5 mm heavy-duty.

Specifications

Size (mm)	Size (inch)	Max RPM	Max Speed
125 × 1.0 × 22.2	5" × 1/24" × 7/8"	12,230	80 m/s
125 × 1.2 × 22.2	5" × 3/64" × 7/8"	12,230	80 m/s
125 × 1.6 × 22.2	5" × 1/16" × 7/8"	12,230	80 m/s
125 × 2.0 / 2.5 × 22.2	5" × 5/64"–1/10" × 7/8"	12,230	80 m/s
125 × 3.0 × 22.2 (T42)	5" × 1/8" × 7/8"	12,230	80 m/s
125 × 6.0 × 22.2 (T27 grinding)	5" × 1/4" × 7/8"	12,230	80 m/s

How to Choose

Confirm your grinder is a 5" (125 mm) model — a 5 inch disc must never be mounted on a 4.5" grinder with the guard removed.
Match abrasive to material: brown fused alumina for carbon steel; white alumina or single crystal corundum INOX discs for stainless.
1.0–1.2 mm for speed and finish; 2.0–2.5 mm for safety margin and durability on heavy work.

FAQ

Can I use a 5 inch cutting disc on a 4.5 inch angle grinder?

No. The guard and spindle of a 4.5" grinder are designed for 115 mm discs. Using an oversize disc is dangerous and violates safety regulations.

5 inch vs 4.5 inch cutting disc — which should I buy?

If your grinder accepts 125 mm discs and you regularly cut pipe or profiles over 25 mm, the 5 inch disc saves time. For sheet metal and light work, 4.5 inch is sufficient and cheaper.

What thickness is best for stainless steel?

A 1.0 mm ultra-thin INOX disc gives the cleanest cut with the least heat discoloration and material loss.

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