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40A sprocket from Rolcon40A sprocket from Rolcon

40A12 sprockets are an ANSI standard size that has 12 teeth and works with #40 roller chain. These sprockets are known as a “Type A”, which is a hub less roller chain sprocket. Our 40A12 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. Stock bore, can be bored to your dimension.

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Fits ANSI Chain Size: #40
Number of Teeth: 12
Bore (D1): Stock bore
Pitch Diameter (dp): 1.932
Outside Diameter (de): 2.166
Sprocket Thickness (B1): 0.284
Material: 1045CD (Cold Drawn)
Hardened Teeth: Yes (HRC 40-50)
Type of Finish: Black Oxide
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