816-030-01 Roll Ring Tensioner 60B47 Sprockets This 60BS49 sprocket features a

This 60BS49 sprocket features a 2-7/16" finished bore including a key-way and two setscrews

20B Roller Chain Sprockets

41BS25 3/4" Finished Bore Sprocket Dimensions

Bearing Insert: UE 207-20

816-030-01 Roll Ring Tensioner 60B47 Sprockets This 60BS49 sprocket features a816 030 01 Roll Ring Tensioner is a high quality, maintenance free, and self adjusting chain tensioner. The chain tensioner installs in seconds and even works in reversing applications. The 816 030 01 size tensioner works with 80B chain, and features 30 teeth. It's manufactured out of a specially formulated polymer that has a resistance to ultra violet rays, radiation, temperatures, a wide range of chemicals, abrasion, and doesn't change chemically