bolt [bolted, bolting, bolts](to connect pieces using a bolt) verb [UK: bəʊlt] [US: boʊlt]
screw [screwed, screwing, screws](to connect or assemble pieces using a screw) verb [UK: skruː] [US: ˈskruː]Before you screw on the nut, put a washer on it. = Antes de atornillar la tuerca, mete una arandela.
desatornillarverb
unscrew [unscrewed, unscrewing, unscrews](loosen a screw etc.) verb [UK: ʌn.ˈskruː] [US: ʌn.ˈskruː]If you want to unscrew these screws, you should use a screwdriver. = Si quieres desatornillar estos tornillos, deberías usar un destornillador.