Levels of Precision - Choose Wisely: How Fast Your BearingsAug 24, 2015 - The Annular Bearing Engineering Committee (ABEC) created a rating system that has become the industry standard for ball and roller bearing tolerances. ABEC includes five tolerances classes: 1, 3, 5, 7, and 9 with 1 being the widest and 9 the tightestWhat Are ABEC Ratings? | AST BearingsIt was developed by the Annular Bearing Engineering Committee (ABEC) of  There are five classes, going from widest tolerances to tightest: 1, 3, 5, 7, and 9
ABEC scale - WikipediaThe ABEC scale is an industry accepted standard for the tolerances of a ball bearing.  Due to these factors, an ABEC 7 classified bearing could perform better than an ABEC 3 bearing. Bearings not conforming to at least ABEC 1 cannot be The ABEC Myth | TransWorld SKATEboardingJul 13, 2002 - “An ABEC 1 or 3 is all you really need on a skateboard. In skateboarding, you're not using the precision of the bearing.” Heplar thinks the Abec vs. Skate Rated™ - Support - Bones BearingsThe ABEC rating system includes grades 1,3,5,7, and 9. The higher the ABEC rating, the tighter the tolerances are, making the bearing a more precision part. High precision and small tolerances are required for bearings to function at very high RPM, in products like high speed routers that must spin at 20 to 30,000 RPM