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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
For additional information or to get a quote on a inch series R12-ZZ bearing
This 40B33 sprocket is a durable
Pitch Diameter: 82
#200C35 sprockets have 35 teeth
50BS20 Sprocket With 1-1/2" Finished Bore 50B11 Sprockets The standard ABEC 1 precisionThis 50BS20 sprocket featured a 1 1 2" 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 #50 roller chain and sprocket thus preventing premature wear
