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Hot Bearings

On Wed, 22 Nov 2006 16:52:06 GMT, Dave August penned the following well considered thoughts to the readers of rec.crafts.metalworking:

Thoughts....

The new bearings are sealed (2-sides;SZZ)... and not, as some have suggested, shielded.

The (ABMA) C3 refers to internal clearance. The C3 clearance is looser than the (normal) C2 clearance. If you buy an off-the-shelf bearing, you're probably going to end up with a C3.

And the bearing is manufactured to the ABEC-1 tolerance.

I'd be curious to know if the bearing is actually (still) lubricated!

Reply to
Gene Kearns
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You are correct about the seals/shields. MRC elects to use Z to designate seals whereas most mfgs. use it to designate shields. C2 internal clearance is actually tighter than normal. Most mfgs. use no designation or C0 to designate normal with C3 being looser and C2 being tighter. Some mfgs. use EM to designate electric motor quality which will include C3 internal clearance or will designate it as C3. If it doesn't have one or the other or some other designation (C4 for example) you most likely have a normal clearance.

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