80BS17 Sprocket With 1" Finished Bore 2AK104 Pulley This 40BS39 sprocket features a

This 40BS39 sprocket features a 7/8" finished bore including a key-way and two setscrews

Bearing Insert: HC 204

40A57 sprockets with a stock bore comes with a 23/32" inside diameter plain hole and can be easily machine bored to custom sizes

Sprocket Size: 50B16

This 41SH25 sprocket is a durable

80BS17 Sprocket With 1" Finished Bore 2AK104 Pulley This 40BS39 sprocket features aThis 80BS17 sprocket features a 1" finished bore with a key way and two set screws. It is a durable, high quality, and precision sprocket with 17 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 wear