LUCKY ABEC 5 Bearings : Skateboard  One (1) set of eight (8) Lucky Bearings Black Beauty Bearings from Lucky Bearings; Rating: Abec 5; Industry standard size: 608 with a 8mm core, 22mm outer What Are ABEC Ratings? | AST BearingsThere are five classes, going from widest tolerances to tightest: 1, 3, 5, 7, and 9. Higher ABEC classes provide better precision, efficiency, and greater speed 
ABEC scale - WikipediaThe ABEC scale is an industry accepted standard for the tolerances of a ball bearing. It was developed by the Annular Bearing Engineering Committee (ABEC) of the American Bearing Manufacturers Association (ABMA).  There are five classes from largest to smallest tolerances: 1, 3, 5, 7, 9The ABEC Myth | TransWorld SKATEboardingJul 13, 2002 - Most of what the skateboarding public knows about the ABEC rating of . selling bearings, mainly with ABEC 1, ABEC 3, ABEC 5, and ABEC 7 Abec vs. Skate Rated™ - Support - Bones BearingsThe answer is that "Bones Bearings are Skate Rated™ not ABEC rated." Bones®  The ABEC rating system includes grades 1,3,5,7, and 9. The higher the ABEC 5 | Enduro BearingsGrade 5 Chromium Steel Balls. High precision balls are within 5/1,000,000″ round. These are military level specification, used for precision equipment