Nyongolotsi ndi zida zamakina ophera Nyongolotsi ndi tsinde lozungulira, la ulusi lomwe limadulidwa pamwamba pake. Thezida za nyongolotsindi gudumu lokhala ndi mano lomwe limalumikizana ndi nyongolotsi, kutembenuza mayendedwe a nyongolotsi kukhala mzere wozungulira wa giya. Mano pa giya nyongolotsi amadulidwa pa ngodya yomwe ikugwirizana ndi ngodya ya helical groove pa nyongolotsi.
Mu makina amphero, nyongolotsi ndi nyongolotsi zimagwiritsidwa ntchito kuwongolera kusuntha kwa mutu wamphero kapena tebulo. Nyongolotsi nthawi zambiri imayendetsedwa ndi mota, ndipo ikazungulira, imalumikizana ndi mano a giya ya nyongolotsi, zomwe zimapangitsa kuti zida ziyende. Kusuntha kumeneku nthawi zambiri kumakhala kolondola kwambiri, kulola kuyika bwino mutu wa mphero kapena tebulo.
Ubwino umodzi wogwiritsa ntchito nyongolotsi ndi nyongolotsi pamakina ogaya ndikuti umapereka mwayi wamakina apamwamba, kulola kuti injini yaying'ono kuyendetsa nyongolotsiyo ikugwirabe bwino. Komanso, chifukwa mano a nyongolotsizida kuchita ndi nyongolotsi pa ngodya osaya, pali mikangano yochepa ndi kuvala pa zigawo zikuluzikulu, nyongolotsi & gudumu nyongolotsi kumabweretsa moyo wautali utumiki kwa dongosolo.