I have repeatedly faced hurdles removing/replacing blades on my (two) grinders. I do have the two-prong tool to turn counterclockwise. But usually that's not sufficient. The underside apparently needs to be vice-gripped - according to comments from another question How to cut rebar with an angle grinder- I presume in the green rectangular area ?

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I don't have any wrench that fits that description that is both:

  • wide enough ~2 inches
  • thin enough to fit below the blade and above the lower nut/bracket

How have folks done this: is there a special wrench for this - or other approach?

  • 3
    There usually is a lock button that locks the spindle on grinders. Would be somewhere on the housing above the spindle. Push it in and then the two prong tool can loosen the nut.
    – crip659
    Jul 19, 2021 at 22:45
  • The lock button is also used to tighten the nut on the wheel, so the wheel stays tight on the spindle.
    – crip659
    Jul 19, 2021 at 22:55
  • @crip659 ah see that now . pls make that an answer Jul 19, 2021 at 23:23
  • @Ecnerwal I added those pics to the accepted answer below Jul 20, 2021 at 3:46
  • Classic XY problem, you asked about how to implement a solution to your problem (how to clamp backside of wheel with vice grip) instead of asking about your problem (how to stop disc from spinning free). Jul 20, 2021 at 5:41

1 Answer 1


Hand grinders have a button to lock the spindle to remove or tighten a grinder wheel. It is usually on the housing above the wheel. Usually just a push button, that pushes a steel rod into a hole in the spindle, to lock it from turning. For safety should unplug grinder from power when changing grinder wheels.

Original Poster here I am adding a picture of the spindle lock to this accepted answer for full clarity.

No Name Grinder

No Name Grinder

Bosch Grinder

Bosch Grinder

  • In addition to this, it's not unusual that the nut has self-tightened during use. Be prepared to hit the 2-pin wrench with something heavy to loosen it. Also be prepared for hitting the 2-pin wrench to knock the wrench flying - apply more force progressively!
    – Graham
    Jul 20, 2021 at 7:42
  • Also be prepared that on no-name grinders the act of hitting wrench will likely cause the locking pin to break the aluminum casting, thus ruining the grinder.
    – jnovacho
    Jul 20, 2021 at 9:04

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