bolt on hub 
SM and BF hub
size:SM12,SM16,SM20,SM25,SM30-1,SM30-2
       BF12,BF16,BF20,BF25,BF30
We also make special SM bolt on hub according to your drawing to meet your spercial requirement.
Bolt on hub is designed for use with taper lock bushes,they provide a convenient means of securing impellers,agitators,fan motors and other devices firmly to shafts.The component is bolted onto the hub,and the hub is mounted the shaft using the appropriate taper bushing.