螺钉

Turn the screw clockwise to tighten it.

screw the parts together

cylinder-headed screw

round-head/square-head screw

loose screw

Phillips/cross-head screw

flat/flat-head screw

attachment screw

machine screw

steel/wood screw

coarse-thread/fine-thread screw

remove a screw

adjust a screw

fix a screw in place; drive in a screw

tighten/loosen a screw

a screw