Ibhola elijwayelekile lensimbi yensimbi enokuqukethwe kwekhabhoni ne-chromium kwakhethwa futhi kulungiswe ukumelana nokucindezela okukhulu phakathi kwento egoqayo nezindandatho.
I-Carbonitrididing kuzo zombili izindandatho zangaphakathi nangaphandle iyinqubo eyisisekelo yokuqina kwama-TPI ibhola abahlinzeki bebhola. Ngale ndlela ekhethekile yokushisa, ubunzima emphakathini womjaho uyanda; okunciphisa ukugqoka ngokufanele.
Insimbi ehlanzekile ye-Ultra iyatholakala kwamanye ama-TPI ajwayelekile we-Ball Bearlings 'Series manje, ukumelana nokugqokwa okuphezulu kutholakala ngokufanele. Njengoba ukukhathala kokuxhumana kuvame ukubangelwa ukufakwa okuqinile okungekho kwensimbi, ama-bearings kulezi zinsuku adinga amazinga akhethekile wokuhlanzeka.