Izinhlobo eziyisishiyagalombili zama-thrust ball bearings ziyingxenye ebalulekile futhi ebalulekile kumishini yesimanjemanje.Umsebenzi wayo oyinhloko ukusekela umzimba ojikelezayo wemishini, ukunciphisa ukungqubuzana ngesikhathi sokunyakaza kwawo, ukuqinisekisa ukunemba kwawo kokujikeleza.Idlala indima ebalulekile ekwandiseni impilo yomshini.