Bosch 125 mm angle grinder buying guide
Updated: 22 October 2026
You have already decided on a 125 mm disc and a blue Bosch Professional body, then amazon.co.uk shows four listings that are not interchangeable. One is a 720 W corded grinder, one is a heavier 240 V corded model, one is the same family built for a 110 V site transformer, and one is an 18 V body with no battery in the box. This Bosch 125 mm angle grinder buying guide puts voltage first, then what the shelf price omits, then wattage. The four-ASIN table, with prices in GBP, sits on the [Bosch angle grinder 125 comparison](/hub/tools/bosch-angle-grinder-125). Listings below were read on amazon.co.uk for 19 October 2026. We did not run a lab test. A purchase through our links can earn a commission at no extra cost to you.
You have already decided on a 125 mm disc and a blue Bosch Professional body, then amazon.co.uk shows four listings that are not interchangeable.
You have already decided on a 125 mm disc and a blue Bosch Professional body, then amazon.co.uk shows four listings that are not interchangeable. One is a 720 W corded grinder, one is a heavier 240 V corded model, one is the same family built for a 110 V site transformer, and one is an 18 V body with no battery in the box. This Bosch 125 mm angle grinder buying guide puts voltage first, then what the shelf price omits, then wattage. The four-ASIN table, with prices in GBP, sits on the Bosch angle grinder 125 comparison. Listings below were read on amazon.co.uk for 19 October 2026. We did not run a lab test. A purchase through our links can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Supply | Stated power | Disc on the listing | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Bosch Professional Bosch Professional GWS 12-125 (110 V) | 110 V | 1,200 W | 125 mm stated | 6.4 | about £101.71 | View offer |
 Bosch Professional Bosch Professional GWS 7-125 | 230 V | 720 W | 125 mm stated | 9.2 | about £71.98 | View offer | |
| Best value |  Bosch Professional Bosch Professional GWS 18V-8 | 18 V body only | 800 W | 115 or 125 mm | 8.0 | about £89.44 | View offer |
On this page
Start with the socket or the transformer
Match the supply before you compare watts. On a normal UK ring main you want a 230 V or 220–240 V tool and a plug that actually fits a BS 1363 socket. In this set that is the GWS 7-125, listed at 230 V, or the GWS 12-125 ASIN whose item type is 220–240 V (model 06013A6170). The other GWS 12-125, model 06013A6160 at £101.71, is specified at 110 V for transformer-fed site practice. Plugging that one into a domestic socket is the wrong tool for the supply, not a minor label quirk.
The cordless row is a third supply. The GWS 18V-8 is an 18 V Professional body. It does not plug into the wall, and it does not take green POWER FOR ALL packs. If your Bosch batteries are the green DIY rail, they are a different system; the wider blue-versus-green split is on the Bosch angle grinder comparison. If you own neither blue packs nor a site transformer, the honest start is a corded 230 V or 240 V listing.
A worked example: you are cutting a few lengths of box section in a garage on a 13 A socket. The 110 V ASIN and the body-only 18 V tool both fail that sentence, even if the titles all say Bosch and 125 mm class. Once the supply is settled, wattage is the next argument, and that comparison lives on Bosch GWS 7-125 vs GWS 12-125.
What each amazon.co.uk price leaves out
None of these four shelf prices is a ready cutting kit. The GWS 7-125 at £71.98 lists guard, auxiliary handle, flange, nut and spanner in the carton, not a cutting or grinding disc. The two GWS 12-125 listings follow the same pattern, though they add a keyless protection guard and a plastic clip-on cutting guard in the box story. The GWS 18V-8 at £89.44 is explicit about the gap: no battery and no charger. A locking nut and a two-hole spanner are in the included line; a UK review says there is no quick-release nut.
Discs are a separate spend on every row. Buy a wheel whose diameter matches the guard you receive and whose maximum speed is at least the tool’s no-load speed. The GWS 7-125 states 11,000 rpm. The GWS 12-125 amazon tables in this set do not print a no-load speed, so take rpm from the disc and from Bosch’s documentation for that order number, not from a guess. Electrical Safety First also expects an RCD on extension leads for corded grinders, which is another item the £71.98 figure does not include.
The plug is the other omission that only shows up after delivery on one ASIN. The GWS 7-125 specification says 230 V, but two verified UK reviews report a two-pin plug and an adapter rather than a moulded BS 1363 plug. Check the carton before you rely on it. The 240 V GWS 12-125 is the home-mains sibling; do not solve a plug complaint by ordering the 110 V model instead.
Wattage at 125 mm, after voltage is settled
At 125 mm, 720 W and the 1,200 W class are different jobs, not badge tiers. The GWS 7-125 is 720 W, a fixed 11,000 rpm, and about 2 kg on the amazon specification (Bosch’s UK page quotes about 1.9 kg and a slim 176 mm grip). Reviewers use that shape for light metal and awkward cuts where a flat head matters. It has no variable-speed dial. If the wheel bogs as soon as you lean on thicker steel or you are grinding for long stretches, the motor is telling you the class is small.
The 240 V GWS 12-125 prints 1,250 W on amazon.co.uk and 2.4 kg. You pay £106.74, about £35 more than the GWS 7-125, for that headroom and for faster guard moves. The star line is 3.4 from eight reviews. That is too small a UK sample to treat as a quality verdict, so judge this ASIN on the specification and on Bosch’s documentation, not on the average. The 110 V GWS 12-125 is 1,200 W on its own table, also 2.4 kg, at £101.71, with 5.0 from four reviews. Same heavy corded idea, different supply. Do not add its stars to the 240 V listing and call that a combined score.
Three short routes
If you work at home on 230 V and you will open the box to confirm the plug, the GWS 7-125 is the route with the deepest UK record: 4.7 from 22,017 reviews at the lowest shelf in this set. You still buy a rated 125 mm disc, and you still accept a fixed speed. It is the wrong route if the site supply is 110 V or if you want a keyless guard as a daily habit.
If you already run a centre-tap transformer and you want corded power that does not fade with a battery, the 110 V GWS 12-125 is the only listing here built for that. Skip it for a house. If you already own blue Professional 18 V packs and the work moves around where a lead is a nuisance, price the GWS 18V-8 as body plus packs plus disc, not as £89.44 finished. Listing copy says 115 mm and one UK review says 125 mm; the specification table states neither. Read the guard on the unit you receive before you buy wheels.
Stop and get someone trained when you are mounting wheels at work and you have not been shown how, when the tool smokes or trips the supply repeatedly, or when you are grinding masonry and you have no dust control. HSE guidance on abrasive wheels (HSG17) is about guards, speed and training at work. It is not a claim that any of these four ASINs is the safest grinder.
Common questions
Do I need 720 W or 1,200 W at 125 mm?
For short cuts in thin metal and odd angles, 720 W on the GWS 7-125 is the listing most UK reviewers have actually used. Step toward the 1,200–1,250 W GWS 12-125 class when the smaller motor bogs or you want the keyless guard, and only on the voltage that matches your supply. More watts do not fix a 110 V tool in a 230 V socket.
Which GWS 12-125 is for a home 230 V socket?
The 220–240 V ASIN, model 06013A6170, at £106.74. The other GWS 12-125 in this comparison, model 06013A6160, is 110 V. Titles look alike, so read the voltage line on the amazon page before you order. The 240 V listing’s 3.4 from eight reviews is too thin to treat as a long UK quality score.
When is 110 V the right buy?
When the job already runs from a 110 V site transformer and you want a corded 125 mm Bosch with a keyless guard in that voltage. It is not a cheaper way to get the GWS 12-125 for a domestic ring main. The amazon line shows 5.0 from four reviews, which is too few texts to read as proof.
Does the GWS 18V-8 include a battery?
No. The listing is body only, at £89.44, without a charger. You need a compatible blue Professional 18 V pack, and you still need a disc. Green POWER FOR ALL batteries are a different Bosch rail and are not the assumption on this page.
Will the GWS 7-125 plug fit a UK socket?
The specification table says 230 V, which is the right mains voltage, but two UK verified reviews report a two-pin plug supplied with an adapter. That is not the same as a moulded BS 1363 plug. Check what arrives, and use an RCD if you are on an extension lead.
Are discs in the box?
No cutting or grinding disc is listed in included components for these four ASINs. The GWS 12-125 rows do include a plastic clip-on cutting guard. Budget for a 125 mm wheel whose speed rating suits the tool, and do not mount a 125 mm disc on a 115 mm guard from another grinder.
Is eight reviews enough to judge the 240 V GWS 12-125?
No. Eight reviews at 3.4 stars can be skewed by one or two orders. Use the wattage, the keyless guard, the weight and Bosch’s UK documentation for 06013A6170. Use the GWS 7-125’s 22,017 reviews when you want a statistical picture of a small blue Bosch, not as a proxy score for the heavier model.
Related pages
Sources
Public UK sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the four amazon.co.uk listings captured on 19 October 2026. HSE HSG17 and PUWER apply at work. They are not a certificate for a domestic garage.
- HSE, HSG17 Safety in the use of abrasive wheels (retrieved 19 October 2026)
- Electrical Safety First, Angle grinders (retrieved 19 October 2026)
- Bosch Professional, GWS 7-125 (retrieved 19 October 2026)
- Bosch Professional, GWS 12-125 (retrieved 19 October 2026)
- Screwfix, Angle grinder buying guide (retrieved 19 October 2026)