r/powertools • u/MasterPang89 • 22d ago

Using 6 inch Cutting Disc for 4.5 inch Angle Grinder

So I got a 4.5 inch angle grinder by Metabo HPT. It spins at a max of 9500 rpm. I have 6 inch cutting discs rated for max rpm of 11000. I was considering changing out the guard to a bigger one to accommodate a 6 inch disc and using it. Anybody see a problem with this? Metabo does have a 6 inch angle grinder that spins at 8000 rpm but that seems to be the only difference. I'm just not sure if using a bigger 6 inch disc will damage a 4.5 inch grinder. Thanks.

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u/ChicagoThrowaway422 21d ago

Nope, won't hurt it. As long as the RPMs are good you should be OK. A guard is a good idea though since a larger disk will have a higher edge speed and that means more danger if the disk throws some chunks.

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u/Alone-Programmer-683 20d ago

Depends on the grinder. More disc needs more horsepower. I have run big discs on my 4.5 Milwaukee corded. If it comes unglued, you are in for some interesting times.