40BS23 High-Performance Sprocket 1-7/16" UCFCSX00 4-Bolt Set Screw Flange Bearing This 40BS12 sprocket featured a

This 40BS12 sprocket featured a 7/8" finished bore with a key-way and two set screws

While the phosphate coated and then painted finish adds corrosion resistance to the 10C240M sheave

Recommended Maximum Bore: 1-3/16"

Dimension (F): 2-1/2"

40BS23 High-Performance Sprocket 1-7/16" UCFCSX00 4-Bolt Set Screw Flange Bearing This 40BS12 sprocket featured aThis 40BS23 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