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The standard ABEC 1 precision standard that almost all ball bearings are made to today has a deviation of -10 micrometers
UCPX15-47 Bearing Dimensions
Pulley Size: 2AK39H
Sprocket Size: 120A16
Weight (LBS): 2
40BS29 High-Performance Sprocket 1-3/16" Chain Size The standard ABEC 1 precisionThis 40BS29 sprocket featured a 1 3 16" finished bore with a key way and two set screws. It is a durable, high quality, and precision sprocket with hardened teeth. Sprockets that have hardened teeth last longer and are much more durable than those that don't. Something else that is notable about this sprocket is that it fully meets all ANSI Standards, which insures proper contact between the #40 roller chain and sprocket thus preventing premature wear
