Bolt-on Hubs e etselitsoe tšebeliso ea lihlahla tsa taper, ho kenyeletsoa mofuta oa BF le SM.
Ba fana ka tharollo e bonolo ea ho boloka li-rotor tsa fan, li-impellers, agitators le lisebelisoa tse ling tse tlamehang ho tlamelloa ka thata ho li-shafts.