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Variable speed angle grinder buying guide

Updated: 22 October 2026

You are looking at nine corded angle grinders on amazon.co.uk, each listing claiming a dial or a speed selection, with shelf prices from £24.99 to £79.99. A variable speed angle grinder buying guide has to start with the socket in front of you, then the speed printed on the disc, and only then the dial. This page is that checklist. The [angle grinder with speed control comparison](/hub/tools/angle-grinder-with-speed-control) holds the matrix of disc size, watts and what each box actually names. Products Compared read those amazon.co.uk listings on 21 October 2026. We did not run a lab test. A qualifying purchase can earn us a commission at no extra cost to you.

You are looking at nine corded angle grinders on amazon.co.uk, each listing claiming a dial or a speed selection, with shelf prices from £24.99 to £79.99.

Our top picks

Bosch Professional Bosch GWS 9-115 S 230 V

Best overall

Bosch Professional Bosch GWS 9-115 S 230 V
8.6/10about £77.00
View offer
Bosch Professional Bosch GWS 9-115 S 110 V

Alternative

Bosch Professional Bosch GWS 9-115 S 110 V
6.5/10about £79.99
View offer
KATSU Tools KATSU 115 mm 750 W

Best value

KATSU Tools KATSU 115 mm 750 W
6.3/10about £24.99
View offer
On this page
  1. 1.Match the volts before the brand
  2. 2.Rate the disc to the top speed
  3. 3.A six-speed dial is not constant speed
  4. 4.Read the star line once

Match the volts before the brand

The supply decides the shortlist before any star line does. In this capture, 230 V is printed on the Bosch GWS 9-115 S part 0601396171 at £77.00 and on both POSENPRO listings at £33.99. 110 V is printed only on Bosch part 0601396161 at £79.99. KATSU, TOPWAY, TEENO, DEWINNER and LiunxDromic leave the voltage line blank. HSE’s construction guidance says site tools should be cordless or 110 V centre-tapped to earth, so the voltage to earth stays at or below 55 V. A 230 V tool on a site needs an RCD. A blank spec block is not a voltage you fill in from a review that mentions a plug. The 110 V or 230 V page works the two Bosch part numbers through.

Rate the disc to the top speed

The dial does not rewrite the speed the disc must be rated for. FEPA’s EN 12413 leaflet says the machine speed must not exceed the maximum marked on the wheel, and the guard stays on. A DeWalt variable-speed manual says the accessory’s rated speed has to be at least the tool maximum, whatever the dial is doing. Printed maxima here are 11,000 rpm on the KATSU and 12,000 rpm on TOPWAY, TEENO, both POSENPRO models, DEWINNER and LiunxDromic. The two Bosch amazon files say speed selection and do not print an rpm band, so you use the plate on the tool you receive. Turning the KATSU down does not make an underspeed disc legal. That listing says lower speed means lower power. FEPA also says not to grind with a cutting wheel.
Bosch Professional Bosch GWS 9-115 S 230 V

Testsieger

Bosch Professional Bosch GWS 9-115 S 230 V
8.6/10about £77.00
View offer

A six-speed dial is not constant speed

None of the nine raw files states constant-speed electronics, soft start, or restart protection. The Bosch Professional manual for the GWS 9-115 S describes a thumbwheel, restart protection and a speed range. Those lines live in the manual. They are not printed in the amazon raw files. KATSU states that a lower setting cuts power, with higher speeds advised for demanding tasks. TOPWAY prints six speeds and a 12,000 rpm maximum, with no numeric floor. TEENO, DEWINNER and LiunxDromic print 2,000–12,000 rpm. Both POSENPRO models print 3,000–12,000 rpm. A retailer guide updated on 24 September 2026 prices other variable-speed grinders around £212–£336 and talks about constant speed. Those tools are not in this basket.

Read the star line once

A high count is only useful if the reviews belong to that listing and to the United Kingdom. The 230 V Bosch is 4.6 from 205, and the 50 saved blocks are UK reviews. They praise speed selection and they also include burnout, oil seeping, and a disc that stuck. The 110 V Bosch is 4.4 from 22, with five UK blocks. The two POSENPRO pages both show 4.2 from 160, and the review text is the same block, so you count it once. TEENO shows 4.2 from 143, but only six of the first 50 blocks are from the United Kingdom. TOPWAY is 3.3 from five, including a head that came away from the housing. KATSU is 3.4 from 14. 115 mm is the KATSU and both Bosch names. 125 mm is both POSENPRO models, TEENO, DEWINNER and LiunxDromic. TOPWAY’s title says 115 mm and 125 mm, and the bullet says 125 mm.

Common questions

Do I need variable speed if I only cut steel?
For short cuts in mild steel, a fixed-speed grinder is enough and a dial is optional. In this set the dial is why the nine listings sit together. KATSU still says demanding work wants the higher speeds, because the low setting cuts power. Slowing the dial does not make an underspeed disc legal. None of these raw files claims constant-speed electronics.
Is 115 mm or 125 mm the default?
Hilti’s UK guide treats 115 mm as the size for tighter reach and 125 mm as the common general size. Screwfix’s retailer table puts about 500–900 W against 115 mm and about 700–1200 W against 125 mm. That table is not a test of these motors. Here the 115 mm names are the KATSU at 750 W and both Bosch models at 900 W. TOPWAY’s title prints both diameters and the bullet says 125 mm.
Will any of these run on a building site?
Only Bosch part 0601396161, at £79.99, prints 110 V. HSE points site tools toward 110 V centre-tapped to earth, or cordless tools. The 230 V Bosch and both POSENPRO listings print 230 V. The other five print no voltage, so they are not a site choice until the listing or the tool shows one.
Why do two POSENPRO pages show the same 4.2 from 160?
The review text for B0BPBR4P93 and B0GLN17T49 is the same block, and both pages show 4.2 from 160. That is one sample, not 320 people. The 1200 W file also prints both 2.51 kg and a 1.8 kg bullet, and it disagrees about a grinding wheel. Count the stars once.
What does the KATSU listing admit about low speed?
The bullet calls the controller cost-efficient and says lower speed means lower power, and that the low setting is not for heavy-duty work. The printed maximum is 11,000 rpm, with no numeric floor. That warning makes the £24.99 row readable. It is not a claim that the motor holds power when you slow a pad.
Can I trust TEENO’s 143 reviews as British?
The listing is 4.2 from 143. Of the first 50 blocks, six are from the United Kingdom, and two of those six say the switch did not stay off or the tool turned itself on. The other blocks are from other countries and are not UK opinion. One UK note that the low setting helped on stone does not turn 143 into a British sample.

Related pages

How to use an angle grinder with speed control

Polishing with an angle grinder

Best angle grinder with speed control

Angle grinder with speed control

110 V or 230 V angle grinder for a UK socket or site

Sources

Public UK sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the nine amazon.co.uk listings captured on 21 October 2026. HSE site-voltage guidance and PUWER apply at work. They are not a certificate for a domestic grinder. Restart protection and the 2,800–11,000 rpm band are Bosch manual facts, not amazon bullets.

  1. HSE, HSG17 Safety in the use of abrasive wheels (retrieved 21 October 2026)
  2. HSE, Electrical supplies for construction sites (retrieved 21 October 2026)
  3. BSI, BS EN IEC 62841-2-3:2021+A11:2021 (retrieved 21 October 2026)
  4. FEPA, EN 12413 bonded abrasives safety leaflet (retrieved 21 October 2026)
  5. Electrical Safety First, Angle grinders (retrieved 21 October 2026)
  6. GOV.UK, UKCA and CE marking in Great Britain (retrieved 21 October 2026)
  7. Bosch, GWS 9-115 S manual (retrieved 21 October 2026)
  8. amazon.co.uk listings for the nine ASINs (retrieved 21 October 2026)