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50B56 sprockets with a stock bore comes with the standard 1" inside diameter hole with no keyway or setscrews and can be easily machine bored to custom sizes
UCF211-34 Bearing Dimensions
Sprocket Size: 60BS29
Bearing Size: 6003-2RS
the 6802-ZZ bearing features raceways that are precision honed to a superb finish
80BS23 Sprocket With 2-7/16" Finished Bore filter_80BS21-FB 50B56 sprockets with a stockThis 80BS23 sprocket features a 2 7 16" finished bore with a key way and two set screws. It is a durable, high quality, and precision sprocket with 23 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 #80 roller chain and sprocket thus preventing premature
