ABEC is

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ABEC standard is the separation of different levels of precision bearings used in the manufacturing tolerances and design a set of standards. thrust ball bearing
This standard by the American Bearing Manufacturers Association (ABMA) Annular Bearing Engineering Society / Committee (the Annular Bearing Engineering Committeeor Council, the abbreviation is ABEC) to develop. American Bearing Manufacturers Association (ABMA), formerly known as the lubrication Bearing Manufacturers Association.china bearing
The bearings in the ABEC system is generally called precision bearings, numbered from 1-9, higher number, the higher the level of accuracy of bearing manufacture with. The standard requires that the ball size and tolerance, has nothing to do with the actual results of the bearing. At the same time, an important indicator of the materials, seals, bearings, frames, lubrication, friction tolerances, etc. have not made any provisions.
ABEC standards common misconception: ABEC-7 bearings than ABEC-1 standard bearings turn fast, long time use ABEC-7 standard bearings must only use the oil without grease, resin bearing frame than the brass good brass than steel.
angular contact ball bearing