Home » Resources » Bearing FAQs » What are "precision" versus "high-precision" ball bearings?

Q9. What Are Precision vs. High-Precision Ball Bearings?

"Precision" and "high-precision" are generic bearing terms; however, there is no official definition for either in the bearing industry. Generally speaking, "precision" ball bearings comply with ABEC-1 and ABEC-3 tolerances while "high-precision" ball bearings comply with ABEC-5, ABEC-7, or ABEC-9 tolerances.

Some general purpose ball bearings intentionally do not comply with the ABEC precision tolerance specifications and are not graded or rated as such.


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