Bosch 125 mm angle grinder corded or cordless
Updated: 22 October 2026
You are stood between a socket and a shelf of blue Bosch batteries, trying to decide whether a lead or an 18 V body is the honest buy for 125 mm work. Corded tools in this set run as long as the supply does. The cordless price on amazon.co.uk is a bare GWS 18V-8, and the disc is extra on both paths. This page is the corded-or-cordless choice for a Bosch 125 mm angle grinder. It is not the 720 W versus 1,200 W argument; that stays on [GWS 7-125 vs GWS 12-125](/hub/tools/bosch-angle-grinder-125/sub/bosch-angle-grinder-125-7-vs-12). Shelves and stars are on the [Bosch angle grinder 125 comparison](/hub/tools/bosch-angle-grinder-125). Products Compared compared amazon.co.uk listings as of 19 October 2026 and did not lab-test runtime. Our links can earn a commission at no extra cost to you.
You are stood between a socket and a shelf of blue Bosch batteries, trying to decide whether a lead or an 18 V body is the honest buy for 125 mm work. Corded tools in this set run as long as the supply does.
You are stood between a socket and a shelf of blue Bosch batteries, trying to decide whether a lead or an 18 V body is the honest buy for 125 mm work. Corded tools in this set run as long as the supply does. The cordless price on amazon.co.uk is a bare GWS 18V-8, and the disc is extra on both paths. This page is the corded-or-cordless choice for a Bosch 125 mm angle grinder. It is not the 720 W versus 1,200 W argument; that stays on GWS 7-125 vs GWS 12-125. Shelves and stars are on the Bosch angle grinder 125 comparison. Products Compared compared amazon.co.uk listings as of 19 October 2026 and did not lab-test runtime. Our links can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Supply | Stated power | Listed weight | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Bosch Professional Bosch Professional GWS 7-125 | 230 V corded | 720 W | 2 kg | 9.2 | about £71.98 | View offer |
| Best value |  Bosch Professional Bosch Professional GWS 18V-8 | 18 V body only | 800 W | 1.22 kg body | 8.0 | about £89.44 | View offer |
| Alternative |  Bosch Professional Bosch Professional GWS 12-125 (240 V) | 220–240 V corded | 1,250 W | 2.4 kg | 5.4 | about £106.74 | View offer |
On this page
What the corded 125 mm listings are good at
A mains grinder does not sag after ten minutes because a pack is empty. In this comparison the corded choices are the GWS 7-125 at £71.98 (720 W, 11,000 rpm, about 2 kg on the amazon specification, 4.7 from 22,017 reviews), the 240 V GWS 12-125 at £106.74 (1,250 W on that listing, 2.4 kg, 3.4 from eight reviews), and the 110 V GWS 12-125 at £101.71 (1,200 W, 2.4 kg, 5.0 from four reviews). The first two are the home-mains pair. The third is for a site transformer, not a domestic 13 A socket.
That spread is the corded strength and the corded trap. You can pick a light 720 W body for short cuts or a heavier motor when the wheel bogs, and you can keep cutting while a cordless user is swapping packs. You also inherit a cable, a voltage, and, on the GWS 7-125, a plug check: two UK reviews report a two-pin plug and an adapter rather than a moulded BS 1363 plug. Electrical Safety First still wants an RCD on an extension lead, and the lead itself has to stay out of the wheel.
A UK review on the 110 V GWS 12-125 prefers corded site power over batteries for long cuts. Treat that as one person’s site, not a percentage. It does illustrate the case where cordless freedom is the wrong trade: a transformer is already in the setup, the cut is long, and a pack would be the part that stops first. Voltage order, if you are not sure you are even on 230 V, is the buying guide.
Where the GWS 18V-8 is the better shape
The GWS 18V-8 is listed at £89.44, 800 W on the amazon line, 1.22 kg, and 4.7 from 531 reviews. That weight is the practical win. Holding a 2.4 kg corded GWS 12-125 overhead to dress a bracket is a different afternoon from a body a kilo lighter, provided the pack on the tool is one you already own. There is no cable to route across a driveway, and you are not looking for a socket on a scaffold.
The listing is body only. No battery, no charger, and no disc. A UK review says there is no quick-release nut, so disc changes are a locking nut and a two-hole spanner, isolated, the same discipline as the corded tools. Listing copy says 115 mm. One UK review says 125 mm and quotes 11,000 rpm. The specification table states neither diameter nor rpm. Until you read the guard on the unit in your hand, do not buy a stack of 125 mm wheels for it, and do not assume it is the same disc as the GWS 7-125.
Power on the box is not a promise that it out-pulls a 1,250 W mains motor. 800 W is the listing’s figure for the cordless class, and it only exists while the pack can deliver it. A full blue Professional pack on a short cut can feel ample. The same body on a tired 2 Ah pack, leaned into thick steel, will slow down. That slowdown is the moment to stop, not to load the wheel harder. Green POWER FOR ALL packs are a different Bosch system; if that is what you own, this ASIN is not your cordless path. The parent Bosch angle grinder comparison is where those rails are separated.
What the shelf prices hide
Put the three money figures in one sentence. The cheapest complete-looking corded tool here is £71.98 and still needs a disc. The dearest corded tool is £106.74 and still needs a disc. The cordless body is £89.44 and needs a disc plus at least one compatible pack and a way to charge it. If you already paid for those packs for a drill, the marginal cost is the body and the wheels. If you own none, the cordless route is a battery system with a grinder attached, and the GWS 7-125 is the lower cash outlay for the same first cut.
Five-year cost is not something these listings measure. A rule of thumb, labelled as one: a corded tool’s ongoing spend is discs, and occasionally a lead or an RCD. A cordless tool’s ongoing spend is discs plus packs that age. Nobody on these amazon pages has published a five-year bill, so do not treat £89 versus £72 as the whole story in either direction. What you can say is that the body-only price is not a kit price.
Review depth is lopsided and should stay in the decision. 22,017 reviews on the GWS 7-125 and 531 on the GWS 18V-8 are both usable UK samples. Eight and four reviews on the two GWS 12-125 listings are not. Choosing the 240 V corded tool over cordless because it is more grinder can be right on motor size and still be a thin quality file. Choosing cordless because 4.7 looks like the GWS 7-125’s 4.7 ignores the fact you may still need to buy batteries.
The choice in one situation
If you do not own blue Professional 18 V packs, buy corded. For a home socket that is the GWS 7-125 after you confirm the plug, unless you already know you need the heavier 240 V GWS 12-125. If the only supply is a 110 V transformer, the cordless body does not replace the 110 V GWS 12-125.
If you do own those packs, and the jobs are short, awkward, and away from a lead, the GWS 18V-8 is the better shape, after the guard diameter is confirmed. If the job is a long grind that would flatten a pack, stay on mains even if the batteries are in the van. None of this is a lab ranking, and none of the shelf prices includes the wheel that actually touches the metal.
Common questions
Is the cordless model lighter for overhead work?
The GWS 18V-8 listing weight is 1.22 kg for the body. The corded GWS 7-125 is about 2 kg on amazon, and both GWS 12-125 listings are 2.4 kg. A battery adds mass the 1.22 kg figure does not include, so the overhead advantage shrinks once a large pack is fitted, and it disappears if you have to hold a spare pack as well.
Will my Bosch battery fit the GWS 18V-8?
Only if it is a blue Professional 18 V pack for this platform. Green POWER FOR ALL batteries are the other Bosch rail and are not assumed to fit. The listing itself contains neither a battery nor a charger, so a photo of a pack on a different Bosch drill is not proof.
Does corded always beat cordless on power?
No. The 240 V GWS 12-125 prints 1,250 W, which is more motor than the GWS 18V-8’s stated 800 W, and it does not fade with state of charge. The GWS 7-125 is 720 W, which can sit under that 800 W figure on paper and still win on a long cut because the lead does not go flat. Match the comparison to the corded ASIN you would actually buy.
Which is cheaper over five years?
The listings do not show a five-year cost. On day one, £71.98 plus a disc is less cash than £89.44 plus a disc plus batteries and a charger. If the packs are already on the shelf, the gap narrows to the body and the wheels. Packs that need replacing later are the cordless cost the shelf price hides.
Can the GWS 18V-8 do the same 125 mm jobs?
Only if the guard you receive is for 125 mm discs. Amazon copy on this ASIN says 115 mm, and one UK review says 125 mm. The corded tools in this set state 125 mm. Do not buy discs for the cordless body until that conflict is settled on the tool, not in the title.
When is corded the sensible default for a long grind?
When the cut or the grind would outlast a pack, or when you have no blue packs at all. A site reviewer on the 110 V listing preferred corded power for long cuts; that is an anecdote, and it matches the simple limit that a battery is a fuel tank. Use the 110 V corded ASIN only on a proper 110 V supply, not as a general home recommendation.
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)