50A21 Type "A" Plate Sprocket 3/4" Stock Bore

50A21 sprockets are a ANSI standard size that has 21 teeth and works with #50 roller chain. These sprockets are known as a "Type A", which is a hubless roller chain sprocket. Our 50A21 plate sprockets are a durable, high strength sprocket that is manufactured from 1045CD carbon steel. After manufacturing, the teeth are hardened to help minimize wear, then a black oxide finish is applied for corrosion resistance.

50A21 Sprocket Dimensions

• ANSI Chain Size:50
• Bore (B):3/4''
• Tooth Count:21
• Pitch Diameter (PD):4.193''
• Outside Diameter (D):4.521''
• Sprocket Thickness (T):0.343''
• Material:1045CD
• Hardened Teeth:Yes (HRC 40-50)
• Type Of Finish:Black Oxide

All dimensions listed are nominal values.