This 9 tooth chain sprocket is used with size #40, #41, and 420 chain found on 20 & 30 Series torque converters. It uses the common 5/8" bore (inside) diameter that matches up to the 5/8" axle shafts on many popular models.

This is a Type C sprocket where the 5/8" thick hub is centered equally on both sides. (Type B sprockets have the hub offset to one side.) In addition, the shaft key is an integral (or "broached") part of the sprocket.

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