25B40 Sprocket With Stock Bore #120 BTB Type Sprockets What sets this 6903-ZZ bearing

What sets this 6903-ZZ bearing apart from others is the ABEC 3 precision standard that this bearing is made to

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Sheave Weight: 121 LBS

Maximum Bore: 4-1/4"

the 6806-ZZ bearing features raceways that are precision honed to a superb finish

25B40 Sprocket With Stock Bore #120 BTB Type Sprockets What sets this 6903-ZZ bearingThis 25B40 sprocket is a durable, high quality, and precision sprocket that is manufactured to ANSI Specifications. Something else that is notable about this sprocket is that it fully meets all ANSI Standards, which insures proper contact between the #25 roller chain and sprocket which prevents premature wear or breakage. This sprocket is also black oxide coated which increases resistance to the environment and will prevent early rust build up. 25B40