The disc on this angle grinder was jamming against the guard. It has a recess in the centre, like this enter image description here Should the hollow part be facing away or towards the open side of the grinder, or is the rule that the side with writing on always faces up? My Bosch manual doesn't even say which side should face up, can anybody provide trustworthy references to mounting a disc

  • 2
    I've always mounted those with the hollow facing out, irrespective of where the writing is.
    – brhans
    Aug 4, 2016 at 14:39
  • @brhans That's what I suspected suspected, since originally the wheel was mounted with the hollow facing down which jammed it up
    – Nic
    Aug 4, 2016 at 14:41

1 Answer 1


The hollow is meant to be mounted outward. This is so that the nut sits at or below flush, allowing the grinding face to be used without obstruction.

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