SKF Spherical Roller Bearing 22317 Cc ABEC-1

Grade 5 Chromium Steel Balls. High precision balls are within 5/1,000,000″ round. These are military level specification, used for precision equipment

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 

The 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, 9

The 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 

Jul 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 

There 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