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abec 5 Bearing

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 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