The Difference between Bolts and Screws

Bolt: A type of fastener consisting of a head and screw (a cylinder with a male thread) that needs to be paired with a nut to fasten and connect two parts with through holes. This form of connection is called bolt connection, such as the nut from the bolt spin down, but also can make the two parts separate, so the bolt connection is a removable connection.

Screws: Also consists of a two-part type of head and screw fasteners, according to the use can be divided into three categories of ——— machine screws, tight screws and special-purpose screws. Machine screws are mainly used for a part with an inner threaded hole, a fastening connection with a part with a through hole, and does not require a nut fit (this form of connection is called a screw connection, also a removable connection; it can also be used with a nut for a fastening connection between two parts with a through hole). The clamping screws are mainly used to secure the relative position between the two parts. Special purpose screws have ring screws for lifting parts.

Bolts and screws are used in different places, bolts on the accuracy requirements are not high, unless there is a requirement, the general bolt removal is convenient, low processing accuracy, not limited by the connection material, widely used, required to cooperate with the bolt, can withstand lateral loads.

The screws are compact in structure, but cannot be removed often and cannot withstand large forces.

In addition, their fastening tools are not the same, bolts are generally used with wrench-type tools, and screws generally use sub-type tools; Tapping screws, is directly screwed into the material is soft workpieces, do not process bolt holes, such as we call the wooden screws are such screws; Its head is exposed outside the workpiece, to make the surface of the workpiece flat, it is necessary to sink, with the inner hexagonal bolts, and the head of the screw is generally flush with the surface of the workpiece, those bolts that are not self-tapping also need to work on the surface of the workpiece to process a slope, just so that the screw head and the workpiece surface flush.