Iiwasha zerabha zihlala phakathi kwe-fastener kunye nomphezulu wayo ukuze kuqinisekiswe ukuhanjiswa kobunzima kunye nokukhusela umphezulu ukusuka kwi-vibration kunye ne-friction.Nangona iiwasha zinokwahluka ngobukhulu, ubume, kunye noxinaniso, ngokuqhelekileyo zithatha imo yeeringi zerabha eziqinileyo ezinomngxuma osembindini wesibophelelo.
