40A21 Type "A" Plate Sprocket 5/8" Stock Bore

40A21 Sprocket Description

40A21 sprockets are a ANSI standard size that has 21 teeth and works with #40 roller chain. These sprockets are known as a "Type A", which is a hubless roller chain sprocket. Our 40A21 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.

40A21 Sprocket Dimensions

• Fits ANSI Chain Size:#40
• Number Of Teeth:21
• Bore (D1):5/8"
• Pitch Diameter (dp):3.355"
• Outside Diameter (de):3.618"
• Sprocket Thickness (B1):0.284"
• Material:1045CD (Cold Drawn)
• Hardened Teeth:Yes (HRC 40-50)
• Type Of Finish:Black Oxide

Interchange Numbers

• 40A21H