Bolt in the mechanical structure or building components for jointing or fastening, solid in the mechanical parts are usually categorized as fasteners. Bolts in the vast majority of cases is in accordance with the relevant national or international standards of manufacturing, so in the business of circulation, bolts and other parts are also produced according to the mandatory standards are categorized as standard parts. Bolts, screws and nuts (also known as nuts) in many areas or non-specialized narratives commonly known or commonly known as screws.

The difference between the bolt and the screw lies in two aspects: one is the shape, the bolt's stud part is strictly required for the cylindrical, for the installation of nuts, but the screw's stud part is sometimes conical or even with the top; on the other hand is the use of the function, the screw screws into the object of the target material instead of the nut. Many occasions in the use of the bolt is also a separate work, was screwed directly into the pre-drilled threaded hole, do not need a nut with its cooperation, this time the bolt from the function is categorized as a screw.

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