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

Nitro 40A21 Sprocket - Type A Plate Sprocket

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 (30-45 Rc)
• Type Of Finish: Black Oxide

Interchange Numbers

• 40A21H