Our 40BS21H sprocket is an ANSI standard sprocket with a 1-1/2" finished bore that has a keyway & 2 setscrews. 40BS21 sprockets are a 21 tooth sprocket that works with ANSI #40 roller chain. These sprockets are manufactured from 1045CD carbon steel material. The sprocket teeth are hardened for increased wear resistance.
Stay up-to-date with new products releases, news and promotions.