The most used, the most feared · review
The machine that cuts its own motor when the disc jams — which is the moment a grinder throws itself out of your hands.
Where we come out The complete safety set, on the most powerful machine here. Priced accordingly.
Two hundred and seven euros, 1,900 W, and the only machine on this page with all three safety systems: a brake, anti-restart, and jam detection.
Active Feedback sensing Technology watches for the sudden speed drop that means the disc has bound — in a closing kerf, on an edge, in a burr. When a grinder jams, the disc stops and the motor does not, so the whole machine tries to rotate about the disc, and 1,900 W is enough to take it out of a two-handed grip. AFT cuts the motor in a fraction of a second.
It does not undo the jam. It stops the machine from driving through it, which is where the injuries come from.
Anti-restart, so a switched-on machine does not come alive when the supply returns. A brake, so the disc stops rather than free-spinning for the several seconds that make people set a running tool on a bench.
Makita does not publish a stopping time for the brake — the FLEX below does, at 3.5 seconds, and a published number is worth more than the word « brake ».
Nineteen hundred watts in a 125 mm (4.92 in) machine is a lot of torque. That is exactly why the safety electronics matter here more than on the €46 machine at the top of this page: the same jam, four times the energy behind it.
Power, disc diameter, brake, anti-restart, AFT, speed adjustment, switch type and part number come from the manufacturer’s published specification. No brake stopping time is stated there, and none is invented here. Market availability was verified per market on the EAN.
Prices quoted in this text were read on 2026-08-13. The live price is at the top of the page.
| Power | 1,900 W |
|---|---|
| Disc diameter | 125 mm (4.92 in) |
| Brake | Yes |
| Anti-restart | Prevents starting after a supply interruption |
| AFT | Active Feedback sensing Technology — stops the motor when the tool jams |
| Speed | Adjustable by dial |
| Switch | Slide switch, with electronics |
| Part number | GA5091X01/2 |
| Amazon reference | B0C7LKVPVK |
| EAN | 0088381768450 |
A sudden loss of motor speed — the signature of a disc binding in a cut or catching an edge. When that happens the machine’s reaction torque goes into the operator’s wrists, which is how grinders end up across a workshop or into a leg. Cutting the motor within a fraction of a second does not undo the jam, but it stops the machine driving through it.
It is more than most people need and exactly what a professional cutting heavy section wants. The consideration is control: a machine with that torque and a jammed disc is genuinely dangerous, which is why this one has jam detection and a brake. Power and safety electronics belong together — a 1,900 W machine without them would be the wrong buy at any price.
8.1/ 10
The complete safety set, on the most powerful machine here. Priced accordingly.
A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom, United States. Listed is not the same as in stock — availability changes daily.
Details checked on August 13, 2026.
Daily cutting and grinding, where the jam that throws the tool is a question of when
Here because the consumable states this machine by name.
Specifications: the manufacturer sheet for welding and metalworking machines and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
1,400 W · constant electronic · soft start · €100
The same 1,400 W as the Metabo beside it, with a soft start it does not have and a quick-change nut it does.
Best for: Steady, heavy grinding where the machine runs for minutes at a time
900 W · 2,800–11,000 rpm · speed preselection · €61
Variable speed at €61 — which matters because stainless, paint and thin sheet all want a slower disc than steel.
Best for: Mixed work — stainless, painted steel, thin sheet — where full speed is the wrong answer
720 W · 176 mm (6.93 in) grip · flat gear head · €46
The cheapest professional-line grinder here, bought for its 176 mm (6.93 in) grip and its flat head rather than its power.
Best for: Light dressing, deburring and short cuts, where the tool is picked up and put down all day
