40BS25 High-Performance Sprocket 1-1/4" filter_35B42-SB While the phosphate coated and

While the phosphate coated and then painted finish adds corrosion resistance to the 2BK25 pulley

you identify the chain pitch to confirm that you are using this on a #40 roller chain

Sprocket Size: 35BS16

100B40 sprockets with a stock bore come with the standard 1-1/4" inside diameter hole with no keyway or setscrews and can be easily machine bored to custom sizes

40BS25 High-Performance Sprocket 1-1/4" filter_35B42-SB While the phosphate coated andThis 40BS25 sprocket featured a 1 1 4" 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