I have always put the side without the metal towards the nut. My thinking is it will grip the nut better than the smooth metal and will tighten the nut whilst in use and less chance of the disc slipping.
But also when removing a disc it is often easier if the grippy bit is on the nut and the slidy bit on the spindle side.However, the nut will self tighten when rotating, so shouldn't matter.
Yes one way only but does not allow for a numpty.^^ I hear you.
I've had to bust one once to get off
My gear head lock was slipring a bit
The logical ones are cupped, and grinding of coarse can only go the one way.
Yep, some grinders with slitting disks don't tighten, so a washer is provided.Does anyone know about the plastic rings/washers or cardboard rings sometimes packed in with the discs?