A bolt has a thread on its shaft, and is screwed into a nut which has a threaded hole. The bolt and the nut grip objects tightly. You can tighten […]

Screw anchors are used to fix objects to walls where screws do not work effectively. A common type of screw anchor, which is used for plasterboard walls (drywalls), is called […]

Screws have screw heads and threaded shafts. You can tighten or loosen them with a screwdriver. When a screw is driven into a material, it generates friction between the thread […]