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2AK56 Pulley 3/4" Dimensions
120R21 sprockets are bored to accept a R1 type taper bushing
40A15 sprockets with a stock bore comes with a 5/8" inside diameter plain hole and can be easily machine bored to custom sizes
2BK28 Pulley 1-1/8" Dimensions
40BS21 High-Performance Sprocket 1-1/2" 7" Stock Bore 2AK56 Pulley 3/4" DimensionsThis 40BS21 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 #40 roller chain and sprocket thus preventing premature wear
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