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Picture may not depict actual tooth count
Picture may not depict actual tooth count

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

Item ID: 40A21
Availability: 98 In Stock
Price: $7.41
Retail Price:$9.80
Your Savings:$2.39(24%)

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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 diagram

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