20B-2 hub sprockets have two tooth rims and work with duplex 20B-2 chain of 1 1/4" (31.75 mm) pitch to DIN 8187 / ISO 606. They are used in drives in which a simplex 20B chain runs at the limit of its strength.
20B-2 sprocket - strengthening the drive without rebuilding the machine
A second chain strand increases the transmitted power at the same sprocket diameter, which lets you strengthen the drive without rebuilding the machine. You bore out the pilot bore for your shaft, and selected larger sprockets are available in grey cast iron, which dampens vibration well.
20B-2 duplex sprockets with a hub to be bored out
20B-2 duplex hub sprockets in C45 steel with unhardened teeth, and selected grey cast iron sprockets. 20B duplex sprockets with induction-hardened teeth are in the Hardened hub sprockets group.
Frequently asked questions about sprockets for 20B-2 chain
Which sprocket in the drive wears faster?
Usually the driving sprocket - it has fewer teeth and makes more revolutions. That is why it is worth choosing a version with hardened teeth for the driving sprocket.
