40A21/2.5

40A21 sprockets are an ANSI standard size that has 21 teeth and works with #40 roller chain. These sprockets are known as a “Type A”, which is a hub less 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. Bored for 2-1/2 diameter tube.

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Fits ANSI Chain Size:	#40
Number of Teeth:	21
Bore (D1):	2.510
Pitch Diameter (dp):	3.35
Outside Diameter (de):	3.62
Sprocket Thickness (B1):	0.284
Material:	1045CD (Cold Drawn)
Hardened Teeth:	Yes (HRC 40-50)
Type of Finish:	Black Oxide