7/8" Grinder Wheels on 5/8" Arbor?

[@newwb]

4" wheels with a 5/8" hole are meant to be used on a 4" pneumatic or 4" electric grinder with a 3/8" or M10 arbor (threads). The centering flange is 5/8". 4.5" angle grinders are meant to use 4.5" wheels with a 7/8" hole. They can also use thread on 5/8-11 attachments. The threads (arbor) are 5/8-11 but the centering flange is 7/8". Thicker 4" wheels with a 5/8" hole may fit on a 4.5" grinder but may be slightly off center as shown in the video. A 4" cutoff wheel will not center at all. Hope this helps someone out there.

[@Hoellewood_Solutions]

I have been digging hard to find a way to use 5/8 cutoff discs on my grinder and I can figure it out. Nothing I do can get enough grip. Normally, I understand that I’m not supposed to do that, but I have a bunch of 4” discs and only 4.5” grinders. So I’m trying to figure out a way to do this so they won’t go to waste. Ever heard of an adapter anywhere, or am I gonna have to invent one?

[@newwb]

@@Hoellewood_Solutions If you must, a workaround is to purchase a 5/8 washer to use as the upper flange. The washer is thinner than the stock upper flange allowing the wheel to center perfectly on the upper part of the arbor. Then flip over the bottom nut.

[@Hoellewood_Solutions]

@@newwb thanks, I did something a little similar, but I’ll have to keep trying different washers and arbor nuts, cause what I had didn’t work

[@JustMakeItNow]

Thanks for adding extra info!

[@jimmylovesbikes]

That did help clear my confustion, thank you!

[@jencstephens5452]

I spent nearly an hour reading Q&A online, still not finding a straight answer. Thankfully Google search suggested your video, and now All my questions have been answered. Thank you so much!!!

[@JustMakeItNow]

Glad I could help!

[@jshepard152]

Very helpful video. My instruction manual says that the "nut", which is really called the "outer flange" is raised on one side to give you more room to work with thick accessories. If the wheel you're using is thin, you'll use the flat side against the wheel (as you showed) to secure the wheel.

[@JustMakeItNow]

Thanks for your comment, this is helpful!

[@robertorodriguezmartinez6935]

Thank you ..... For so many years i been wondering how to use a 7/8 disc on a 5/8 arbor grinder. You gave me the answer .... that nobody was able to give me Muuuchas Gracias !!!

[@JustMakeItNow]

Glad I could help!

[@nathanwelsh2002]

So you just flip the flange around?

[@JeffEikenberry]

In Lowe's parking lot trying to figure all this out before buying one because I was so confused. Your video was VERY helpful to me! Thanks you!

[@JustMakeItNow]

Hey, I know the feeling ;) Glad I could help.

[@alanmcrae8594]

Thanks for this video. I was just trying to figure out how I was going to get a 7/8" wheel on my 5/8" arbor. This answers that question.

[@JustMakeItNow]

I knew I was not the only one with that questions ;)

[@crawlspacetechs5973]

Great video. Very informative. You answered the question I’ve been fighting all morning while I’m shopping for abrasive cut off wheels

[@JustMakeItNow]

I knew I was not the only one with this question ;)

[@Ebbyman413]

Just bought a 4 1/2" grinder and a bunch of flap disks last night, got home, and had the sloppy fit. Assuming I screwed up and bought the wrong parts, I figured I best search the issue first. KZbin University to the rescue again! Thanks for the video - this saves me a trip back to the store.

[@JustMakeItNow]

KZbin University is the best university! :)

[@dusk525]

Your video is very helpful thank you. I just bought a cordless dewalt 5/8 angle grinder and then realized when I got home I bought a bunch of 7/8 discs. Happy to find out I don't have to go exchange them.

[@JustMakeItNow]

Glad I could help

[@steven6068]

Good comprehensive video explaining about the two types of discs that fit the grinder.

[@JustMakeItNow]

Thanks! 👍

[@heinrichstrasser1064]

You are THE MAN my friend !! Exactly what I was searching for - Many Thanks !!!

[@JustMakeItNow]

Glad I could help!

[@jlubejesse]

Just read my dewalt Manuel and this is exactly correct what is said in video. It also has a picture of flange being placed both ways depending on size.

[@JustMakeItNow]

Good to know that at least 2 manufacturers mention that specifically. I know that in addition to Dewalt, Ryobi manual also states the same.

[@kingdommusic5456]

i would you say Its ok to do this on a 1/4 thick grinding wheel but not on a thin 1/8 or 1/16 cutting wheel

[@harleyfee364]

Thanks for the video! Made better sense than the other two vids I watched on it. Found the perfect angle grinder for me today, had it in my hands and went to buy the discs, they were all 7/8, the grinder was 5/8. Thought well damn, thats about worthless if I cant buy disks for it. Ill be going back tomorrow to go get it. Again hahaha

[@JustMakeItNow]

Ha, I know exactly what you're talking about ;)

[@bltefft]

Great video. I was wondering how in the world I could use a 7/8 disc on my 5/8 inch angle grinder. Now I know, thanks a lot.

[@JustMakeItNow]

No problem 👍

[@Man_on_the_Moon]

I just went through this whole problem trying to buy a grinder for masonry wheels and couldn't find a 7/8. Good to know to just flip it around I was seriously pulling hairs out over this looking for adapters and searching the specs of 20 different grinders and getting several hardware employees involved.

[@JustMakeItNow]

That's pretty much where I started ;)

[@rickie2sticky66]

Its so dumb that this isnt explained anyyyyywhere in the milwaukee grinder i just bought... a logical person would assume if u got a 5/8" arbor on the grinder that that is the size wheel you should get! Apparently not! Glad i found this video before i started using my grinder!

[@JustMakeItNow]

Glad I could help!

[@jassibrar8418]

Bro thanks for this video! I thought i bought wrong attachments but looks like im good! Thank you!!

[@JustMakeItNow]

No problem 👍

[@BlossomPainting]

Can you use a 7 inch wheel (with the 7/8 arbor) on a 4.5" with a 5/8th arbor. I can only think that the lower RPM on a 7inch may cause the disk to snap or break under the higher rpm (10,500rpm) of a 4.5" grinder? If the 7/8 disk does fit as shown then would a 7inch dust shroud be acceptable for safety purposes while gaining the vacuum feature also??

[@JustMakeItNow]

This sounds like a terrible idea. I can't see how you would fit 7" wheel in place of 4.5" - there is a guard that is way too small, and even if you remove it (terrible idea, again!) then there are just physical dimensions of the tool and ability to hold it without touching larger wheel. Even if you somehow manage to physically mate 7" wheel with 4.5" grinder, your suspicion of rpms causing problems is spot on. Max rated speed of 7" wheel is likely much lower than 4.5" grinder rpms. Overspeeding wheels can crack and shatter, potentially within minutes, and that is not the thing that you want to happen, ever. Just don't do it. If you really need work done with 7" wheel, get a proper grinder, or just rent it out if it's a one-off.

[@BlossomPainting]

@@JustMakeItNow The reasoning behind the inquiry is in the case of not having a rental place or supplier at hand. The arbour can interchange as far as I can see. The 4.5 guard can be switched to a 7inch dust shroud/guard. A variable speed 4.5 at 3000 rpm should meet 7" blade safety. Clearance on the hand is understood. I understand YOU WOULDN"T try this But I was hoping for someone who may have tried. I may be that person .. and of coarse I'll be as careful as can be triple checking so I can send you an update.

[@wildflower1542]

What a good explanation ...

[@JustMakeItNow]

Glad you think so!

[@matt7iron]

Seems like every rookie new to this angle Grinder thing has these 5/8 7/8 problems at the beginning until we get the hang of it, Question is there an adapter to extend the grinder out past the guard so I can sand some Ruff paint off my garage while holding the grinder flat against the wall

[@JustMakeItNow]

You don't need an adapter, you just need a right cup wheel, e.g. similar to what you can see in the thumbnail (this is for concrete and not paint stripping, but it works flat on the surface). Cut-off wheels (the ones you use on the edge) are not supposed to be used with these types of 4.5" grinders because their regular guards are not designed to cutoff wheels. But for cup wheels that shouldn't be an issue, that's what these grinders are designed for, you just need to find the right wheel for your application. . Or if all you want to do is to strip some loose paint (instead of sanding the wall), you may simply go with some kind of wirebrush, this should do the trick.

[@BeboGama]

Thank you so much body, you helped me a lot. God bless you.

[@JustMakeItNow]

You're welcome!

[@Ottavisrepairs]

You hit major questions. Thanks 🙏

[@JustMakeItNow]

My pleasure!

[@peterbosch8112]

Surprisingly helpful.

[@JustMakeItNow]

Happy it was useful!

[@ProTechEpoxyFloors]

Took a while to get to the point but thanks. Just saved me a lot of aggravation

[@JustMakeItNow]

Glad I could help! ;)

[@mrhuron303]

I bought a HF Bauer 8 amp 4 1/2” angles grinder with 5/8” arbor.The directions say to use a disc with 5/8” arbor hole. - threaded and non-threaded discs? Also, says grinder is not to be used for cutting. Anyone know if the HF Bauer can be fitted with a Type 1 guard? Anyways, thanks for the video, and helpful comments.

[@JustMakeItNow]

Most of the cheap(er) 4 1/2" grinders are the same as in they don't have type 1 (cutoff) guard even as an option, and as such have a language in the manuals that states that you're not supposed to use it for cutoff operations. It is possible that some of the branded type 1 guards will fit (DeWalt, Milwaukee), or perhaps there are some universal ones on Amazon. Don't have first hand experience with those though.

[@KNESBEY]

Awesome explanation sir... Thank you for this video

[@JustMakeItNow]

Glad you liked it!

[@shamptown]

Thank you for posting this! Now can someone please explain why this information isn't in my user manual? Doesn't seem like common knowledge. I feel like the manufacturers want people to seriously injure themselves.

[@JustMakeItNow]

I know, right?!

[@mystictraveler8642]

Great video. Thank you.

[@JustMakeItNow]

Glad you liked it!

[@nonameno6690]

great video...thanks for this...so helpful!!!!

[@JustMakeItNow]

Glad it was helpful!

[@mantaszmenskis5619]

hey, is that madder growing over there?

[@JustMakeItNow]

I don't think there should be any madders in this corner of the yard, but it's been a while, so maybe? ;)

[@steveboone5480]

These so called indestructable disc come with 20mm bore? What to do about that?

[@JustMakeItNow]

I think blades for 20mm arbor are most likely for tile saws, not angle grinders. Though not sure about your particular discs.

[@garysites1528]

Excellent. Thanks you.

[@JustMakeItNow]

You're welcome!

[@xro5841]

Why can't there EVER be just a Standard size? No More 5/8 or No More 7/8 pick one and ALL Disks have to be the Standard. From Now on. Or is there SOMETHING I am missing? WHY are there two sizes?

[@JustMakeItNow]

Ha, 5/8" and 7/8" are not the only options, sometimes these are metric in several different sizes as well! ;)

[@waleadeyeye3176]

Thanks Sir

[@JustMakeItNow]

You are welcome!

[@meghrajbilwani2526]

Thanks

[@JustMakeItNow]

You're welcome!

[@Hoellewood_Solutions]

Do not buy 5/8” arbor cutoff discs for your 4.5” grinder. If the disc isn’t thick enough like a grinding disc or flap disc, then you won’t be able to properly center the disc. This can lead to high vibration in the disc, which will cause more damage to the piece you’re cutting and MORE IMPORTANTLY, It CAN cause the disc to Explode, which WILL DO more damage to things like your face. That being said, if anyone knows of a safe adapter to make those discs work on a 4.5” grinder, please let me know

[@JustMakeItNow]

More importantly, you need to use the right guard for cutoff operations.There are type 1 (flat) and type 27 (depressed center) wheels and corresponding guards. Usually cutoff wheels are type 1, but pretty much all 4.5" angle grinders come with type 27 guards. For some grinders you can switch guards to accommodate different wheel types. Not that people don't use type 27 guards for cutting off, but it is not particularly safe. If the wheel shatters, type 27 guard has the whole side unprotected (because it is meant for grinding flat where that side is protected by the workpiece).

[@Hoellewood_Solutions]

@@JustMakeItNow amen! Man I’ve had a disc explode in my face cause the guy I was working with didn’t have a guard, I was lucky there was no damage, but it really did hurt. Thank goodness for sunglasses

[@jeffe7327]

@@JustMakeItNow It is really hard to find Dewalt Type1 guards (I have the DCG415 model) as each model has different latching designs and they don't put the part #'s (N311439 for this model!) in the owner manuals making a Google search mostly fruitless. And the major retailers don't sell them nor does Dewalt show them on their company website. I finally found a phone number for a company service center who had someone help me order it after Dewalt 800# gave me the wrong part #. I have emailed Dewalt saying the grinders should really come packaged with both guards as they aren't that expensive compared to the tool and it is a safety issue as you describe. At least get the retailers to sell the Type 1 guards if they are going to sell the grinders with other accessories like the various wheels that require them.

[@JustMakeItNow]

@@jeffe7327 This is very true, these Type 1 guards are hard to find. And DeWalt is notorious for having these guards specific to the grinder model and sometimes even generation of the model. But at least they do manufacture them. Some brands just flat out do not have them AFAIK (Hi Ryobi!). There is some interchangeability with the other brands though, I believe some Milwaukee guards fit Ridgid grinders.

[@shtika]

I would not use the 5/8 grinder disk, you should use 7/8 for this grinder. The 5/8 threads are not going to center a 5/8 grinder disk. The only 5/8 you shoulod be using is the ones that thread on.

[@JustMakeItNow]

Thick surface grinding wheels would center just fine on 5/8 threads. Not sure about thin cutoff discs, but you're not supposed to use these anyway with this grinder due to the guard being open.

[@shtika]

@@JustMakeItNowJust remake the video after you read the instructions.

[@Kwuiz]

You guys really need to be careful using 4” & 5” disks on your 4 1/2” grinders. Just because it can fit doesn’t mean that it should, make sure that the disks your using are under the RPM rating of the grinder that you’re using.. so don’t go using a 11,000 RPM rated 4” disk on a 13,000 RPM 4 1/2” grinder… Grinders really aren’t as dangerous as everyone makes them out to be, it’s just the people that pick them up and have no idea what they’re doing.

[@JustMakeItNow]

I agree in general, but have you seen any discs like that in this video? Also, I don't think you can fit a 5" disc on 4 1/2" grinder unless you remove the guard, and you're not supposed to do that in the first place, that's the main safety feature. Using smaller diameter discs is _usually_ fine, as bigger discs normally meant for lower rpms, but you need to see rpm ratings obviously. I think much more common safety issue with regular grinders is using Type 1 (flat) discs when only Type 27 (depressed center) are supported. Most (?) non-pro 4 1/2" grinders are like that, and many people just remove the guard and still use flat cut off discs. This is not safe as guards for Type 1 are different, and most these grinders don't even have this as an option.

[@bartrademakers2486]

Fine explanation, but the bigger disc was no longer inside or flush with the guard…

[@JustMakeItNow]

This is a cup wheel meant to be used with its flat side rather than the edge. Cup wheels have to stick out of the guard or you can't use them properly, would just drag the guard on the surface.

[@ypure3859]

still sketchy...use an adapter ring to be safe

[@WoodCutr1]

Not sketchy, this is how the grinder is made to be used

[@JustMakeItNow]

Indeed so!

[@chriswilliams5699]

Great video. Earlier today my brain was melting as I looked at all my 5,8,7 stuff thinking I had something wrong. I was further confused at the hardware store that did not have a 5/8 arbor cutting wheel but had it in the grinding ones. Now it all makes sense and I know I don’t have to trash the 7/8 stuff.

[@jshepard152]

@@chriswilliams5699 Had the same problem. I knew something was wrong when the arbor was locked but the wheel spun freely.