A screw with a Phillips head.

A steel pile having a wide helical blade attached at the foot; it is twisted into soft ground in order to provide a large bearing area

(engineering) A screw cut on a solid whose sides are arcs of the periphery of a wheel into whose teeth the screw is intended to work.

(nautical) A form of jack screw for lifting large bodies and assisting in launching. / A long screw formerly used to fasten a bedpost to one of the adjacent side pieces.

plural of bed screw

plural of Archimedes' screw

plural of Archimedean screw

(engineering) A screwlike device invented by Greek mathematician Archimedes, ca. 200 B.C.E., which when twisted inside a cylinder, raises water from a lower level to a higher level, allowing irrigation of fields.

A breech pin.

plural of breech screw