Nyongolotsi ndi zida za makina opera Nyongolotsi ndi shaft yozungulira, yokhala ndi ulusi wokhala ndi mpata wozungulira womwe umadulidwa pamwamba pake.zida za nyongolotsindi gudumu lokhala ndi mano lomwe limalumikizana ndi nyongolotsi, zomwe zimapangitsa kuti nyongolotsiyo iyende mozungulira kukhala yolunjika ya giya. Mano a giya la nyongolotsi amadulidwa pa ngodya yofanana ndi ngodya ya helical groove pa nyongolotsi.
Mu makina opera, zida za nyongolotsi ndi nyongolotsi zimagwiritsidwa ntchito kuwongolera kayendetsedwe ka mutu wa mphero kapena tebulo. Nyongolotsi nthawi zambiri imayendetsedwa ndi mota, ndipo ikazungulira, imalumikizana ndi mano a zida za nyongolotsi, zomwe zimapangitsa kuti giyayo iyende. Kuyenda kumeneku nthawi zambiri kumakhala kolondola kwambiri, zomwe zimathandiza kuti mutu wa mphero kapena tebulo liyike bwino.
Ubwino umodzi wogwiritsa ntchito zida za nyongolotsi ndi nyongolotsi mu makina opera ndi wakuti zimapereka ubwino waukulu wa makina, zomwe zimathandiza kuti injini yaying'ono iyendetse nyongolotsiyo pamene ikuyendetsa bwino. Kuphatikiza apo, chifukwa mano a nyongolotsizida Ngati mugwiritsa ntchito nyongolotsi pa ngodya yosaya kwambiri, palibe kukangana ndi kuwonongeka kochepa pa zigawo zake, ndipo gudumu la nyongolotsi ndi nyongolotsi zimapangitsa kuti ntchito ya dongosolo ikhale yayitali.