Nuts And Bolts

Bolts are one of the most common elements used in construction and machine design. They hold everything together – from screws in electric toothbrushes and door hinges to massive bolts that secure concrete pillars in buildings.

Nut, in technology, fastening device consisting of a square or hexagonal block, usually of metal, with a hole in the centre having internal, or female, threads that fit on the male threads of an associated bolt or screw. A bolt or screw with a nut is widely used for fastening machine and structural components.