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, li-agitator le lisebelisoa tse ling tse lokelang ho tlamelloa ka thata ho li-shafts.