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76 mm mini grinder vs 115 mm angle grinder

Updated: 22 October 2026

You have two tabs open. One is a cordless 3 inch cutter. The other is a 4½ inch grinder that a hire page also calls mini. The 76mm vs 115mm angle grinder choice is which format to buy before you compare brands. If the cut is a bolt, a stud or thin pipe in a gap, start with the 76 mm cutter. If you need to grind, sand, or cut deeper than about the mid-20s of millimetres, start with the 115 mm grinder. The ten kits are the small format only, on the [mini angle grinder comparison](/hub/tools/mini-angle-grinder). A qualifying purchase can earn a commission at no extra cost to you.

You have two tabs open. One is a cordless 3 inch cutter. The other is a 4½ inch grinder that a hire page also calls mini. The 76mm vs 115mm angle grinder choice is which format to buy before you compare brands.

Our top picks

INGCO INGCO CAGLI76012

Best overall

INGCO INGCO CAGLI76012
9.2/10about £55.99
View offer
TEENO TEENO TEENO-3608

Best value

TEENO TEENO TEENO-3608
8.6/10about £39.99
View offer
Normodic Normodic 0HGPA

Alternative

Normodic Normodic 0HGPA
6.0/10about £25.99
View offer
On this page
  1. 1.Two tools, one nickname
  2. 2.Discs, spindles and depth
  3. 3.Which job is which
  4. 4.If you already own one of them

Two tools, one nickname

A 76 mm mini grinder here is a cordless cut-off tool for a disc of about 75 mm or 76 mm. A 115 mm angle grinder is the general DIY machine: a larger disc, a deeper cut, and the usual home for flap discs and weld work. The nickname is the trap. Rapid Hire advertises a "Mini Grinder 115mm" for pipe, rust, weld beads and mortar. Hire that, and you have hired the 4½ inch class. A DCA 115 mm, 860 W corded grinder was removed from this set as a misfit.

Discs, spindles and depth

The discs do not swap. A usual disc on these 76 mm tools has a 10 mm bore. Rivlox states M5. INGCO's title states M6. A 115 mm disc uses a 22.23 mm bore on M14. Published figures put about 16 mm on a 76 mm tool, usually under 20 mm, and about 28 mm on 115 mm. Normodic's listing says 20 mm. Screwfix's 115 mm line is about 30 mm. Removing the guard to fit a 115 mm disc on the small tool is the refusal.
INGCO INGCO CAGLI76012

Testsieger

INGCO INGCO CAGLI76012
9.2/10about £55.99
View offer

Which job is which

Choose the 76 mm cutter when the metal is a bolt, a stud or thin pipe in a void, and a 115 mm guard would hit the bracket first. Choose the 115 mm grinder when you need to grind a weld, run a flap disc, or go deeper than about the mid-20s of millimetres. That band comes from the published 16 mm to 20 mm small-tool figures and Screwfix's about 30 mm for 115 mm. It is not a line we cut. A dearer 76 mm trade tool is still the small format.

If you already own one of them

If you already own 115 mm discs, keep them on a 115 mm grinder. The bore and the guard are wrong. You would still need 75 mm or 76 mm discs with a 10 mm hole, marked for the small tool's speed. That cost sits on top of a kit which runs from £22.94 to £55.99. If you already own only the small cutter, leave it on the short metal cuts it can finish.

Common questions

Which one cuts a bolt behind a bracket?
The 76 mm cutter, when the shank is thin enough and the guard still fits. A 115 mm guard often hits the bracket first. Reviews here describe short chassis cuts, and stalling if the load is heavy. If the bolt is deeper than the small disc can reach, use 115 mm, provided it can enter. Neither size is a reason to take the guard off.
Which one grinds a weld or runs a flap disc?
The 115 mm grinder. Weld beads and flap discs are that format's work. A 76 mm cutter is for a short cut in a gap. INGCO includes grinding discs, and reviews still say it can stall under a heavy load. Those discs do not make it a weld grinder. If grinding is the job, buy the larger format rather than a dearer 76 mm cutter.
Can I put a 115 mm disc on a mini tool if I remove the guard?
No. The bore is wrong, about 22.23 mm against 10 mm, and the spindle is M14 against M5 or M6. Removing the guard takes away the part that contains fragments. HSE guidance and Electrical Safety First both say to keep the guard and not to turn the tool into something else. A smaller disc can be easier in a gap. It is not safer with the guard gone.
What bore and spindle change between the two?
Small tools here use about a 10 mm bore. Rivlox states M5. INGCO states M6. Bosch's GWS 12V-76 page also states 10 mm and M5. A 115 mm disc is 22.23 mm on M14. Worx's WX801 page states 9.5 mm, so 10 mm is not universal even among 76 mm tools. A blank bore on an Amazon listing is a reason to wait.
Is cordless the difference, or is size the difference?
Size is the difference. This capture is cordless 76 mm tools, and a hire 115 mm grinder is often corded, but either format can be cordless. Diameter, bore and job decide it. A 12 V pack does not make a tool right for a weld. A mains lead does not make 115 mm right for a bolt behind a bracket. Choose the format first.
How deep can each one go?
Published figures, not our measurement, put 76 mm at about 16 mm and usually under 20 mm. Normodic's listing says 20 mm. The same sources put 115 mm at about 28 mm, and Screwfix states about 30 mm. Use the mid-20s of millimetres as the band where the larger format is the honest start. A thin bolt in a gap stays with the smaller figure, if the guard can enter.

Related pages

Mini angle grinder buying guide

Mini angle grinder cutting bolts

How to use a mini angle grinder

Mini angle grinder

Best mini angle grinder UK: a shortlist, not a crown

Sources

Public UK sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the ten amazon.co.uk listings captured on 21 October 2026. HSE vibration limits and PUWER apply at work. They are not a certificate for a domestic kit.

  1. HSE HSG17 (retrieved 21 October 2026)
  2. Control of Vibration at Work Regulations 2005 (retrieved 21 October 2026)
  3. HSE INDG175 (retrieved 21 October 2026)
  4. Electrical Safety First, Angle grinders (retrieved 21 October 2026)
  5. BSI BS EN IEC 62841-2-3:2021+A11:2021 (retrieved 21 October 2026)
  6. GOV.UK OPSS PSA2 (retrieved 21 October 2026)
  7. Bosch GWS 12V-76 (retrieved 21 October 2026)
  8. Toolstation Worx WX801 (retrieved 21 October 2026)