Iibheringi ezizilungelelanisayo zinemiqolo emibini yeebhola ezinomdyarho oqhelekileyo ongqukuva kwiringi yangaphandle.Oku kunika iibheringi ipropati yazo yokulungelelanisa, evumela ukungahambi kakuhle kwe-angular shaft ngokumalunga nezindlu.Ngoko ke zifaneleke ngokukodwa kwizicelo apho ukungahambi kakuhle kunokuvela kwiimpazamo ekufakeni okanye ekuphambukeni kwe-shaft.Kwi-addiiton, iibheringi zebhola ezingatywinwanga ezizilungelelanisayo zineyona friction iphantsi yalo naluphi na uhlobo lokuthwala.