Guide
To ABEC Rated Skate Bearings
Fountain
Valley Skating Center's pro shop offers the best quality skate gear
at affordable prices. Our highly-trained staff is available for
consultation to provide the best product for your specific needs.
What Does ABEC Mean?
The
ABEC scale is a system for rating the manufacturing tolerances of
precision bearings. The system was developed by the Annular Bearing
Engineering Committee or Council (ABEC) of the American Bearing
Manufacturers Association (ABMA). The American Bearing Manufacturers
Association was formerly known as the Anti-Friction Bearing Manufacturers
Association.
Bearings
rated under the ABEC system are typically called "precision
bearings", and they are rated with a number from 1 to 9, with
the higher number assigned to bearings manufactured against a higher
standard of precision (high number = tighter tolerances = more expensive
bearing).
What
Does Tolerance Mean?
Tolerance
is the amount of variation from an absolute exact measurement that
is permitted during the manufacturing process.
Other
Rating Systems:
ABEC
is only one system for rating bearing tolerances. The International
Standards Organization (ISO) and the German National Standards Organization
(DIN) use similar scales to rate the precision of bearings. In the
ISO and DIN systems, a smaller number means a tighter tolerance
and a larger number means a looser tolerance. This is just the opposite
of the ABEC system. See the following table for equivalents.
| ABEC |
ISO |
DIN |
| ABEC
1 |
Normal |
P0 |
| ABEC
3 |
Class
6 |
P6 |
| ABEC
5 |
Class
5 |
P5 |
| ABEC
7 |
Class
4 |
P4 |
| ABEC
9 |
Class
2 |
P2 |
|
Key:
ABEC = ABMA system for rating ball bearing tolerances
ISO = International Standards Organization
DIN = German National Standards Organization |
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