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single sealed vs shield ball bearings

single sealed vs shield ball bearings

single sealed vs shield ball bearings

(OP)
Hello everyone,
This may seem as too basic a question but nevertheless, I am having a problem in understanding what is the difference if any,  between a SEAL as opposed to a SHIELD bearing.

RE: single sealed vs shield ball bearings

Seal involves rubbing, usually made out of rubber or some other soft material.

Shield has no rubbing, just a close tolerance to minimize but not eliminate contamination (or keep the grease in, depending on what you think the function is).  Shield is made out of steel.

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RE: single sealed vs shield ball bearings

(OP)
Thanks a lot Electricpete, and what about if its either a single or double  seal or shield?
I was thinking that it was the number of points of sealing that determined  if  it was a single  or double.

RE: single sealed vs shield ball bearings

For a deep groove ball bearing (conrad bearing), there are two sides.  If you have shields on one side that's single-shielded.  If you have shields on both sides that's double-shielded.

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RE: single sealed vs shield ball bearings

Just to make (keep) it confusing the large German bearing manufacturer FAG refers to the enclosures on their precision spindle bearings as having "non-contact seals".
http://www.bardenbearings.com/PDF%20CD/MACHINET.PDF

That's an exception, not the rule.

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