Bolt-on Hubs ua mamanuina mo le faʻaogaina o vao taper, e aofia ai BF ma SM ituaiga. Latou te tuʻuina atu se fofo faigofie o le faʻamautinoaina o rotors fan, impellers, agitators ma isi masini e tatau ona faʻamaumau faʻamau i shafts.