1 مکانیک:: کمیته مهندسین یاتاقانهای مدور
Annular Bearing Engineering Committee (ABEC) of the Antifriction Bearing the precision for ball bearings: ABEC grades 1, 5, 7, and 9. ABEC 1 is a standard for most normal applications. to -0.0005 in. is suffcient for ABEC grade 1, while 0.00000 to -0.00010 in. is required for ABEC grade 9.
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