40BS21 High-Performance Sprocket 1-7/16" filter_35B21-SB This 35BS21 sprocket features a

This 35BS21 sprocket features a 3/4" finished bore including a key-way and two setscrews

Length Through Bore: 8-1/2"

Sheave Size: 25V520SDS

Sprocket Weight: 212lbs

35BB20H idler sprocket is categorized as a ball bearing idler sprocket due to the ball bearing inserted

40BS21 High-Performance Sprocket 1-7/16" filter_35B21-SB This 35BS21 sprocket features aThis 40BS21 sprocket featured a 1 7 16" 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