Fasteners yog wildly siv nyob rau hauv lub tsev, tsheb, nkoj, aircraft, machinery, rooj tog thiab lwm yam khoom.Screws uas ua tau raws li ASME lossis ISO (yav tas los DIN) cov lus qhia ua raws li cov qauv ntsuas no.Sib piv cov xov sib nrug ntawm mating Cheebtsam.Coarse threads yog cov qauv kev lag luam;xaiv cov screws yog tias koj tsis paub lub suab lossis xov ib nti.Cov xov zoo thiab cov xov zoo ntxiv yog nyob ze kom tsis txhob xoob ntawm kev co;qhov zoo dua cov xov, qhov zoo dua qhov tsis kam.