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Metal part, composed of a head and a partially or completely threaded shank, used to secure fastenings and assemblies.
Spiral protrusion on the shank’s surface, for driving the screw into a solid material by turning.
Nonthreaded part of a screw’s shank.
Notch in the head into which a corresponding screwdriver tip can be inserted.
Broadened end of the screw, whose shape and slot vary.
Part composed of a bolt with wings that deploy inside the wall to ensure a solid fastening.
The spring under the wing keeps it folded along the bolt as it passes through a hole made in the wall; it then opens and acts like a nut.
Part composed of a bolt in a sheath that bends when the bolt is inserted, then flattens out against the inside of the wall.