Angle Grinder Arbor Question

[Ridge Runner]

Kind of an embarrassing question, but I'm trying to order some wheels for my grinder and don't have access to it right now. Do both 5/8" and 7/8" hole abrasives fit 4 1/2" grinders or is it only one or the other? My Porter Cable came with a 7/8" grinding wheel and I'm having no trouble finding flap wheels, cut-off wheels, etc. for it, but all of the wire brush wheels listed on Lehigh Valley are for 5/8" arbor. Will the wire wheels fit my grinder as well or will I need an attachment or other grinder?

 

[zkling]

The arbor is threaded 5/8-11. The clearance ring on the backing flange should be 7/8" diameter.

The wire wheels you are looking at thread on where as most of the flap wheels, grinding wheels and cut off disks clamp between the back flange and the nut.

 

[Ridge Runner]

Muchas gracias.

 

[ChevyEFI]

On top of this question, is there any reason I should or shouldn't switch from 7/8" bore to 5/8-11 threaded discs?

Thinking about picking up SAIT 20060 or 20160.

I verified my grinder has a 5/8 hub, 5/8-11 above that, and a spacer with counter ridge making it work with 7/8 hub discs.

 

[Ign]

On top of this question, is there any reason I should or shouldn't switch from 7/8" bore to 5/8-11 threaded discs?

Thinking about picking up SAIT 20060 or 20160.

I verified my grinder has a 5/8 hub, 5/8-11 above that, and a spacer with counter ridge making it work with 7/8 hub discs.

Cost. The threaded discs are more expensive. Otherwise, go for it.

 

[tarbellb]

If given the same price, I like the 5/8" threaded = quicker change outs.

 

[zkling]

Price and balance issues. In my experience then attachments with non integrated threads tend to run smoother. If I could only find cup brushes without integral nuts. :

 

[sberry]

A wheel that has a 5/8 hole is usually for a 4 inch grinder.