50 Chain Sprocket, 21 Tooth, 1 3/8 Finished Bore With Keyway And Set Screws, Model 50BS21-1 3/8, Durable Precision Machined Sprocket For Reliable Power Transmission And Easy Installation

21-Tooth #50 Chain Sprocket with 1-3/8 Bore, BS, single unit
✔️ 21 teeth, bore 1-3/8 in, BS, keyway 5/16 x 5/32, 2 set screws

This is a #50 chain sprocket with a 1-3/8 finished bore and a precision keyway. It’s built for dependable power transmission in conveyors, industrial machinery, agricultural equipment, and other drive systems that use #50 roller chain.

✅ Teeth: 21
✅ Bore: 1-3/8 in (34.93 mm) finished bore
✅ Bore Style: BS
✅ Keyway: 5/16 x 5/32 in (7.94 x 3.97 mm)
✅ Mounting: Includes 2 set screws for secure fit

💡 What is a chain sprocket with a finished bore and keyway used for in power transmission? A handy reference for buyers looking at sprockets. - Transfers rotational motion from a drive shaft to a chain in conveyors, machinery, and farming equipment. - Helps maintain accurate alignment thanks to the keyway and set screws. - Works with #50 roller chain for reliable performance in rugged environments. - Pairs with compatible bearings and lubrication for longer service life.