Nitro roller chain sprockets are manufactured from a quality carbon steel. The teeth on all sprocket styles are hardened to minimize tooth wear*. Sprockets are finished with black oxide to help against corrosion.
Finished Bore Sprocket (Type B/BS) - A Sprocket With A Hub, Keyway & 2 Setscrews (Most Common Style)
Flat Plate Sprocket (Type A) - Flat Hubless Sprocket With A Plain Bore
Idler Sprocket (Type BB) - Flat Sprocket With A Sealed Ball Bearing (Wide Inner Ring)
Weld On Sprocket (X Series) - Sprocket Works With Various Styles Of X Series Hubs - (Allows You To Build A Sprocket)
*Large tooth counts do not have hardened teeth. It's not required since there is enough chain wrap around the sprocket.