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Quick release nut vs X-LOCK: which one you can actually fit

Updated: October 2026

You have seen a Bosch X-LOCK grinder change discs with a click, and you have also seen a nut that claims a tool-free swap on an ordinary M14 spindle. They solve the same annoyance, a lost pin spanner, with two mounts that do not share parts. A quick release nut replaces the outer clamp on a threaded spindle. X-LOCK replaces the spindle interface, so the disc clicks on and there is no flange nut to undo. If your grinder is already X-LOCK, none of the twelve nuts in our table will help. If it is a normal 115 mm or 125 mm M14 machine, X-LOCK discs will not click onto it either. We used Bosch Professional’s UK X-LOCK pages and the amazon.co.uk nut listings captured on 19 October 2026. We did not lab-test either system. The nut scores stay on the [angle grinder quick release nut comparison](/hub/tools/angle-grinder-quick-release-nut). A qualifying purchase can earn a commission at no extra cost to you.

You have seen a Bosch X-LOCK grinder change discs with a click, and you have also seen a nut that claims a tool-free swap on an ordinary M14 spindle.

Our top picks

Milwaukee Milwaukee FIXTEC 4932352473

Best overall

Milwaukee Milwaukee FIXTEC 4932352473
9.4/10about £13.79
View offer
SabreCut SabreCut GRNSCB SUPERLOK

Alternative

SabreCut SabreCut GRNSCB SUPERLOK
9.0/10about £10.99
View offer
Jesiah Jesiah quick release nut

Best value

Jesiah Jesiah quick release nut
7.3/10about £6.29
View offer
On this page
  1. 1.What X-LOCK changes on the grinder
  2. 2.When a nut upgrade still makes sense
  3. 3.A workshop that owns both
  4. 4.What to buy this week

What X-LOCK changes on the grinder

Bosch X-LOCK is a click mount. The disc locks onto the grinder and releases from a lever. Bosch’s UK description is a system without a flange nut, aimed at faster changes and at keeping the usual spanner out of the job. The disc has to be an X-LOCK disc. A standard 22 mm bore cutting or grinding disc, the kind you already buy for an M14 grinder, does not become an X-LOCK disc because you press harder. The grinder has to be an X-LOCK grinder. There is no adaptor nut in this comparison that turns one into the other. An X-LOCK owner who orders an M14 quick release nut, including the Milwaukee FIXTEC or a SabreCut SUPERLOK, has bought a clamp for a thread the tool does not use. The nut will not upgrade the click. The reverse is the same wall: an M14 grinder keeps its inner flange and its outer nut, whether that nut is the factory two-pin piece or a quick release replacement. You still isolate the power, you still keep the guard, and you still match the wheel’s maximum rpm to the grinder. At work, PUWER regulation 9 still expects training for people who use and mount the equipment. The click saves the spanner. It does not rate the wheel. If you are deciding whether your threaded grinder should get a nut at all, the checks are on the buying guide.

When a nut upgrade still makes sense

A nut upgrade makes sense only when you will keep the M14 grinder. You lose the pin spanner between jobs, you swap a cutting disc and a flap on a 115 mm or 125 mm tool, and you want the outer nut to undo by hand. In this set the top pick for that machine, if it has no brake, is Milwaukee’s small FIXTEC, article 4932352473, with a stated limit around 150 mm, about 8 mm thick, and pin holes if fingers lose. Milwaukee excludes that article from quick-stop grinders. It is not the universal 230 mm braking FIXTEC, which is a different product. SabreCut is the stated-size alternative. The slim GRNSCB is 45 mm and 8.9 mm, and it suits flaps and grinding discs better than a 1 mm cutter. The tall GRNSCA is 46 mm and 13.5 mm, for deep flaps and strippers, and reviewers say it often will not clamp a thin cutting disc. Jesiah’s two-pack is the best value when you want DIY spares and you will check the thread, with no published thickness. None of those options is a step toward X-LOCK. They leave you on M14 discs with a 22 mm bore. Choose the nut if the grinder stays. Choose X-LOCK only if you are ready to change the grinder and then buy X-LOCK discs for it.
Milwaukee Milwaukee FIXTEC 4932352473

Testsieger

Milwaukee Milwaukee FIXTEC 4932352473
9.4/10about £13.79
View offer

A workshop that owns both

Plenty of vans now have one X-LOCK grinder and one older M14 grinder. Treat them as two disc stocks, not as one box of abrasives with a clever nut on top. Label the X-LOCK discs and keep them with that tool. Label the 22 mm bore discs and keep the M14 nut, the inner flange, and a pin spanner with the threaded grinder. A single quick-change search returns both systems. The photos look alike because both show a bare disc and a hand. The metal behind the disc is different. The X-LOCK grinder does the disc changes where you already own X-LOCK wheels. Do not try to save a pound by forcing a standard cutting disc onto the click. The M14 grinder keeps a quick nut if you are tired of the spanner, using the small FIXTEC or a SabreCut only after you have confirmed M14×2.0 and rejected a brake the nut is not rated for. How to read that spindle, including the US 5/8"-11 imports that are neither system, is on the M14 thread page. A mixed box is how a cutting wheel ends up used for grinding, which HSE material tells you not to do. If the grinder in your hand is X-LOCK, do not buy a nut from this comparison.

What to buy this week

If the nameplate or the mount is X-LOCK, buy X-LOCK discs and no nut from this table. If the spindle is M14×2.0 on a 115 mm or 125 mm grinder without a brake, use the main comparison: the small FIXTEC when you want pin holes and the large review file, a SabreCut when you need a stated 8.9 mm or 13.5 mm height, or a checked two-pack when you only need a spare. Confirm the thread before you pay. We will not claim either mount is safer. No lab test was done. Both still need a rated wheel, a guard, eye protection, and, at work, training under PUWER regulation 9. A quicker change does not mean a disc cannot come loose or break. Milwaukee’s own exclusion of the small FIXTEC from quick-stop grinders is a reminder that brakes and mounts are specified, not assumed.

Common questions

Is a quick release nut the same as X-LOCK?
No. A quick release nut is an outer clamp for a threaded M14 spindle. X-LOCK is Bosch’s click mount, and Bosch’s UK pages describe it without a flange nut. The discs are different. An M14 nut will not fit an X-LOCK grinder, and an X-LOCK disc will not mount on a standard inner flange with a nut. Same job, different machine.
Can I put an M14 quick release nut on my Bosch X-LOCK grinder?
No. The X-LOCK interface does not take an M14 clamp nut, branded or generic. Milwaukee, SabreCut, and the sub-£8 packs in this set are all threaded nuts. Ordering one for an X-LOCK tool gives you a spare for a different grinder, or a return. There is no thickness or star rating that changes that.
I own a normal M14 grinder. Should I move to X-LOCK instead of a nut?
Only if you are replacing the grinder and you are willing to buy X-LOCK discs from then on. A nut keeps your 22 mm bore discs and costs about £3.99 to about £13.79 in this set, with limits on brakes, diameter and thickness. X-LOCK is a tool change, not an £11 accessory. If the current grinder is sound, the nut is the smaller step.
Do X-LOCK discs fit if I remove the nut?
No. Taking the outer nut off an M14 grinder leaves the inner flange and a threaded spindle. An X-LOCK disc needs the X-LOCK mount. Running any wheel without the correct clamp and guard is a burst risk, not a workaround. Refit the proper nut or use the matching system.
Which system is safer?
We will not claim either is safer. No lab test was done for this comparison. Both still need a rated wheel, a guard, eye protection, and, at work, training under PUWER regulation 9. A quicker change does not mean a disc cannot come loose or break. Milwaukee’s exclusion of the small FIXTEC from quick-stop grinders shows that brakes and mounts are specified, not assumed.
What should I buy this week?
If the nameplate or the mount is X-LOCK, buy X-LOCK discs and no nut from this table. If the spindle is M14×2.0 on a 115 mm or 125 mm grinder without a brake, use the main comparison: the small FIXTEC when you want pin holes and the large review file, a SabreCut when you need a stated 8.9 mm or 13.5 mm height, or a checked two-pack when you only need a spare.

Related pages

Best angle grinder quick release nut

Angle grinder quick release nut

M14 quick release flange nut: checks before you buy

How to fit a quick release nut on an angle grinder

M14 angle grinder spindle thread: what UK tools use

Sources

Public UK sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the twelve amazon.co.uk listings captured on 19 October 2026. PUWER applies at work. It is not a certificate for a domestic disc change, and none of these nuts was laboratory tested.

  1. PUWER 1998, regulation 9 (retrieved 19 October 2026)
  2. HSE, HSG17 abrasive wheels (retrieved 19 October 2026)
  3. FEPA, EN 12413 bonded abrasives leaflet (retrieved 19 October 2026)
  4. HSE, SR21 eye protection (retrieved 19 October 2026)
  5. Power Tool World, Milwaukee 4932352473 (retrieved 19 October 2026)
  6. Bosch Professional UK, angle grinder spindles (retrieved 19 October 2026)
  7. Metabo, Quick flange nut M14 (retrieved 19 October 2026)
  8. SabreCut, GRNSCB 45 mm nut (retrieved 19 October 2026)