With the rapid development of technology nowadays, people's daily lives are almost inseparable from the use of hardware products. When consumers purchase A3-70 bolts or A3-70 screws, they often confuse the two due to their limited understanding of screws and bolts. In the fastener industry, there is no strict distinction between screws and bolts. But smaller ones are often called screws. For example: self tapping screws, fastening screws, wooden screws, etc; Larger screws are called bolts, such as hexagonal bolts, expansion bolts, car bolts, etc. Below, the Shanghai Yaluo Bolt Manufacturer's editor will take you to see the differences between A3-70 bolts or A3-70 screws.
1. Screw is a type of fastener consisting of a head and a screw, which can be divided into three categories according to their use: machine screws, set screws, and special-purpose screws. The connection of screws requires tapping to form threaded holes on the connected parts, usually used for connecting thinner and thicker parts.
2. A bolt is a type of fastener consisting of a head and a screw, which requires a nut to be used in conjunction with it. Only a light hole is needed on the connecting part, and it is generally used when the thickness of the connection between two parts is similar. In terms of head shape, the head of a bolt is generally flat, while the head of a screw can have various forms depending on the applicable situation. Screws and bolts are both considered as connections and fasteners in terms of functionality. Structurally, bolts come in various styles of "heads"; The bolt has no "head"; There are also various styles of "heads" for screws, but the structure of the "head" is different. The "head" of a screw usually has a fastening groove and six internal screws, and screws that can be tightened by hand will be located on the "head"
Roll up the pattern. This makes the size of the screw smaller. In terms of application, bolts and nuts are usually used in pairs for holes, and can be easily replaced if damaged; Studs are generally used in conjunction with nuts, more often than blind holes, and when the connected parts need to be disassembled frequently; Screws are also commonly used for blind holes when disassembling the connecting components. Externally, their fastening tools are different. Bolts usually use wrench tools, while screws usually use screwdriver tools; There are differences in fastening methods. Bolts are usually used in conjunction with nuts or screwed into pre processed bolt holes. In addition to these two methods, screws also have self tapping screws, which can be directly screwed into softer workpieces without machining bolt holes. For example, the wood screws we refer to are this type of screw; The appearance is different, and the head of the bolt is generally adapted to the shape of the tool, such as hexagonal bolts and internal hexagonal bolts. The head is exposed outside the workpiece, and to make the surface of the workpiece flat, it needs to be sunk. For hexagonal bolts, the head of the screw is usually flush with the surface of the workpiece. For bolts that are not self tapping, a slope should be machined on the surface of the workpiece to make the screw head flush with the surface of the workpiece.
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