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Ball bearing sizes


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#1 Zippity

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Posted 12 January 2022 - 08:18 PM

Is there a standard end-bell bearing hole size?

 

I have noticed that there are two different diameter ball bearings available, 5 and 6mm.

 

Is there a preference for one size over the other?

 

Can the same ball bearings be used on the cans?


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Ron Thornton




#2 Bill from NH

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Posted 12 January 2022 - 08:35 PM

Originally 6 mm, now 5 mm. If you have old vintage C-cans, you'll probably want 6 mm.

 

I used GRW bearings in the '70s. The same bearing was used for can & endbell.


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#3 mreibman

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Posted 13 January 2022 - 05:37 AM

It seems not only do you need to realize 5mm vs 6mm, there's also different thicknesses.

For proslot endbells, I use 2x5x1.5mm unflanged. Koford aluminum endbells use this same size.
For redfox, I generally use 2x5x2.3mm unflamged.
I also use 2x5x2.5mm unflanged when they fit.

The 2x5x2.3 and 2.5 can also be used flanged or unflanged on cans. Although you can use the 1.5 unflamged, they are harder to install.

Anyway, those are the 3 sizes I use currently. I have 2x6x2.5 or 2.3, but only for older stuff.
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#4 Zippity

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Posted 13 January 2022 - 06:33 AM

Thanks Guys.

 

I really appreciate your responses :) 


Ron Thornton

#5 Bill Seitz

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Posted 13 January 2022 - 07:41 PM

The "F" setups, Hawk/Hawk6 and ProSlot 4002, add an extra twist. The endbell uses a 5mm bearing, and the can a 6mm. Mura/Champion C-cans and pre-"Rotor" Parma 16D used flanged 6mm on both ends. The newer C and D motors use 5mm on both ends, usually flanged. I keep some of each (flanged and unflanged 5 and flanged 6) in my parts box. I haven't found an instance yet where I couldn't use a thinner unsealed bearing on either end, although installing a thin, unsealed, unflanged bearing in the can end can be a bit tricky. Got to keep the solder out of the bearing.







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