Can you tell the difference between a bolt and a screw?

In the field of fasteners, bolts and screws are the most commonly used, because they are composed of screws and heads, and the head shape is basically the same, so they are often confused.

Bolts are cylindrical threaded fasteners that are used in the process of use and paired with nuts. Their connection form is called bolt connection, which is mainly used to connect two parts with through holes. Screws, which are often said to be screws, are tools that use the circular rotation and friction of the inclined plane of the object to tighten the workpiece gradually and cyclically.

The structure of bolts and screws is composed of the head and screw, there are many kinds of head types, but the head of the bolt is more hexagonal, the general size is relatively large, and the head of the bolt is not necessarily with a groove, the screw is strictly cylindrical, mainly to facilitate the assembly of nuts; The head of the screw is mostly with a groove for fastening or inner hexagon, inner plum, etc., the screw is not only cylindrical, but also conical, with pointed head and so on.

Bolts are generally used in through holes, and are mostly used in pairs with nuts, easy to replace after damage; Screws generally do not need to be equipped with nuts, you can directly connect two objects, the connecting parts need to drill and tap the thread, screws are mostly used for blind holes, and the connected parts are rarely removed.

Bolts are basically installed with a wrench type tool; Screws are tools that use screwdrivers and screwdrivers.

The fastening method of the bolt is to cooperate with the nut or directly screw into the processed bolt hole; In addition to screws and nuts or directly screwed into the hole, there are self-tapping screws that can be directly screwed into the workpiece with soft material, without first processing the bolt hole, such as wood screws.

Bolt connections are generally removable, and the accuracy requirements are not high, suitable for all kinds of material connectors, but also can withstand lateral load; The structure of the screw is more compact than the bolt, but it can not be removed often, and the force is limited. It is mostly used for blind hole connection and not much disassembly.