Iiwasha ezisicaba zentsimbi engenastainless zizinto eziyimfuneko kwizicelo ezininzi zoomatshini kunye nezakhiwo. Zisetyenziselwa ukusabalalisa umthwalo we-threaded fastener, njenge-bolt okanye i-nut, phezu kwendawo enkulu, ukuthintela umonakalo kwizinto eziboshwe. Insimbi engenasici idla ngokuthandwa ngenxa yokunganyangeki kwayo kunye nokuqina kwayo, iyenza ifaneleke kwizicelo apho ukuvezwa kokufuma okanye iindawo ezirhabaxa ziyinkxalabo.