What can a 115mm cordless grinder actually cut?

Rebar, bolts, sheet and box section, slabs and block (with the right disc), plus grinding, chasing, weld cleaning and rust stripping. The 115mm class trades cut depth for control and weight; deep masonry cuts belong to bigger machines.

Why does a paddle switch matter on a grinder?

It's a dead-man's control: the disc only drives while your hand holds the paddle, so a slip, snag or drop stops the tool instead of launching it. On the tool class with the highest mishap potential in the kit bag, that's the single feature we'd insist on.

What batteries does it need?

The Pro 18V system's — realistically the 5.0Ah packs (£54.98 each), because grinding consumes charge faster than any other Pro tool. That's why PKIT-4 bundles two 5.0Ah cells and why we'd never pair this tool with 2.0Ah packs for real work.

Is this the same as the cheaper JCB 18V grinder I've seen?

No - that's the older DIY-line 21-18AG-B on a different battery system. This is the Pro-range JCB-18PAG-115: brushless, paddle switch, digital speed control, Pro 18V batteries, 3-year warranty. Check the model code before buying either.

JCB Pro 18V Angle Grinder Review (JCB-18PAG-115)

Power Tools › JCB Pro 18V › Reviews

JCB Pro 18V Angle Grinder Review (JCB-18PAG-115): The Safety-First Grinder That Completes the Kit

By Mark Moore, Power Tools Editor · Updated 16 October 2026 · 9 min read

How we review: Based on detailed analysis of JCB Tools' official specifications, the published user manual, retailer listings and verified owner feedback. Prices verified July 2026 and subject to change.

⚡ Quick Verdict — 4.4/5

A brushless 115mm grinder built around its safety hardware: paddle-switch start, a tool-free 2-in-1 guard for cutting and grinding, anti-vibration design and digital 4-speed control up to 9,000rpm . Grinders are the tools that punish corner-cutting, and this one's feature list reads like it was specified by someone who's used cheap ones. Buy it inside PKIT-4 (£314.99, with the compact drill and two 5.0Ah packs), or bare onto an existing Pro battery estate.

The angle grinder is the last of the four tools in JCB's Pro 18V kit line-up to get our full treatment - and in some ways the most telling one, because grinders are where budget ranges usually betray themselves. Sparks, dust, shattered-disc risk and hand-arm vibration are the daily realities of the tool; the difference between trade-grade and cheap is mostly in what protects you from those. The JCB-18PAG-115's spec sheet spends its money in exactly those places.

(System overview in the Pro 18V buying guide; kit maths in the PKIT comparison.)

Specifications

Model	JCB-18PAG-115
Motor	18V brushless, up to 9,000rpm no-load
Disc	115mm (4.5")
Control	Digital 4-speed control; paddle-switch start
Guard	2-in-1 safety guard, tool-free switch between cutting and grinding
Ergonomics	Anti-vibration design; tool-free blade change
Applications	Cutting, grinding, chasing, cleaning — metalwork, welding prep, farm, construction (per JCB)
Warranty	3 years tool / 2 years batteries (subject to terms)
Price	£125.99 bare · £314.99 in PKIT-4 (with 75Nm drill, 2× 5.0Ah, charger, soft bag)

📕 Download the JCB 18PAG 115 Manual b2c32437 4bac 4967 a78d 6b2f35f0b6fc (5.2 MB) ⬇

The safety hardware, decoded

Four features here do real protective work, and it's worth knowing why. The paddle switch is a dead-man's control: release your grip and the disc stops driving - no locked-on trigger spinning a dropped grinder across the floor. The 2-in-1 guard converts tool-free between grinding and cutting configurations, which matters because the honest failure mode of guards is being left in the wrong mode (or in the van) when swapping discs mid-job; make it effortless and it stays fitted. The anti-vibration design addresses hand-arm vibration - the slow-burn injury of grinding trades (vibration white finger is no joke on long fence-cleaning or weld-prep days). And digital 4-speed control lets you run flap discs and wire wheels at the gentler speeds they want instead of everything at 9,000rpm. None of this is exotic, it's just rarely all present at £125.99.

Performance and the battery truth

Brushless drive to 9,000rpm is proper 115mm-class performance for cutting bar, bolt and slab, chasing, weld cleaning and rust stripping - the farm-and-fabrication jobs JCB names. The physics caveat we've made throughout this series applies double here: grinders are the hungriest tool on any battery platform. Sustained cutting devours amp-hours, which is why PKIT-4 ships with 5.0Ah packs and no kit pairs this tool with 2.0Ah cells. Budget for big 5.0Ah batteries or accept short sessions - and feed it decent consumables: JCB's own grinding/cutting disc and DIAMONDTECH diamond ranges exist for exactly this tool, and discs, not the grinder, determine cut quality. Standard grinder discipline still applies: guard fitted, disc rated above the tool's rpm, eye/face/ear protection, and let cutting discs cut without side-loading them.

Know which JCB grinder you're buying

Two clarifications that save returns. First, JCB's catalogue also contains an older DIY-line 18V grinder (the 21-18AG-B) at a lower spec and price, a different tool from a different battery line; this review is the Pro 18PAG-115. Second, the Pro range now includes a sibling worth knowing: the flat-head 125mm JCB-18PFAG-125, whose slim head reaches into angles down to 39° - the pipe-trimming and tight-corner specialist. Bigger disc, tighter access; if your grinding lives in awkward spaces, price that one before deciding. For general bench, site and farm work, the 115 reviewed here is the standard pick.

The kit question

Bare at £125.99, this slots onto an existing Pro battery estate cleanly. Starting fresh with cutting in your week, PKIT-4 is the vehicle: this grinder, the 75Nm compact drill, two 5.0Ah E-TECH packs, the fast charger and a soft bag for £314.99 - a modest saving on buying the pieces individually, and a far simpler order. (Why a soft bag? Because grinders and hard cases have never got along; it's the honest choice.) Buying direct wraps the Pro tools in the 12-month free Loxa accidental damage & theft insurance.

✔ Pros

Paddle switch, tool-free 2-in-1 guard, anti-vibration - the safety trio at value money · brushless to 9,000rpm with 4-speed control · tool-free disc change · bundled sensibly with 5.0Ah packs in PKIT-4 · 3yr/2yr warranty + Loxa insurance direct

✘ Cons

Genuinely needs 5.0Ah packs - runtime on small batteries disappoints · 115mm class limits cut depth · JCB's two 18V grinder lines invite confusion - check the model code · tight-access users may prefer the flat-head 125

🏆 Mark's Verdict — 4.4/5

Grinders reveal a range's priorities, and this one's are right: the safety hardware first, the brushless performance second, the price a distant surprise. Feed it 5.0Ah packs and decent discs and it completes the Pro 18V story — four kit tools reviewed, not a dud among them. Cutting trades: PKIT-4. Everyone else: bare, when the platform's already yours.

Check the grinder at JCB Tools (£125.99 bare) →

Or PKIT-4 with drill & 5.0Ah batteries (£314.99) →

About the Author

Mark Moore covers power tools and workshop equipment for Garden Review, with a focus on cordless platforms and trade value. His reviews are based on detailed product research, specification analysis and verified owner feedback rather than manufacturer claims.

Garden Review is reader-supported. Links to JCB Tools on this page are affiliate links — we may earn a commission on qualifying purchases at no extra cost to you. This does not influence our advice or ratings. Prices verified July 2026 and subject to change. Always use discs rated for the tool's speed, keep guards fitted, and wear appropriate protective equipment.