Ho ile ha khethoa li-ball bearings tse tloaelehileng tse nang le khabone le chromium, 'me tsa thatafatsoa ho mamella khatello e matla lipakeng tsa ntho e bilikang le mehele e belehang.
Carbonitriding ka mehele ea ka hare le ea ka ntle ke mokhoa oa motheo oa ho thatafatsa bafani ba bangata ba libolo tsa TPI.Ka phekolo ena e khethehileng ea mocheso, ho thatafala holim'a sebaka sa peiso hoa eketseha;e fokotsang ho roala ka tsela e nepahetseng.
Litšepe tse hloekileng haholo li fumaneha ho tse ling tsa lihlahisoa tsa lihlahisoa tsa TPI standard ball bearing hona joale, khanyetso e phahameng ea ho sesa e fumanoa ka nepo.Kaha mokhathala oa ho kopana hangata o bakoa ke li-inclusions tse thata tse se nang tšepe, li-bearings matsatsing ana li hloka maemo a ikhethang a bohloeki.