Iindidi ezahlukeneyo ze-screws, nganye inoyilo oluthile kunye nomsebenzi wayo.Ezinye iintlobo eziqhelekileyo ziquka izikrufu zomatshini, izikrufu zokuzicofa, kunye nezikrufu zentsimbi.
Isikrufu sentloko ye-hex sinentloko enamacala amathandathu eyenzelwe ukujikwa ngesikrufu okanye isiseko.Ezi zikrufu zisetyenziswa ngokuqhelekileyo kulwakhiwo, oomatshini, kunye nezinye izicelo apho i-torque ephezulu ifuneka ukuqinisa amacandelo.Zifumaneka ngokobukhulu obahlukeneyo kunye nemathiriyeli ukuze zihambelane neemfuno ezahlukeneyo.