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25B40 sprockets with a stock bore comes with the standard 1/2" ID hole with no keyway or setscrews and can be easily machine bored to custom sizes
R18-2RS Ball Bearing Dimensions
Attachment Width (M): 34
HCTB207 Bearing Dimensions
40A50 Sprocket Stock Bore ANSI 40A50 #100 Weld-On Hub Sprockets 25B40 sprockets with a stockThis 40A50 sprocket is a durable, high quality, and precision A Plate sprocket that is manufactured out of high quality steel. 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 or breakage. This sprocket is also evenly coated with black oxide, which adds resistance to to the environment and will prevent
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