Difference one, fastening tools are not the same

The screw generally uses the subclass tool, and the bolt generally uses the wrench class tool.

Difference two, fastening way is not the same

Bolts are usually used with nuts or screwed into the processed bolt holes. In addition to these two ways, screws also have self-tapping screws, which are screwed directly into the workpiece with soft material without processing the bolt holes.

Difference three, the appearance is not the same

The head of the screw is generally flush with the surface of the workpiece, and those bolts that are not self-tapping should also be machined on the surface of the workpiece with an inclined plane, just so that the screw head is flush with the surface of the workpiece.

The head of the bolt generally ADAPTS to the appearance of the tool, such as the hex bolt and the hex socket bolt, whose head is exposed outside the workpiece. In order to make the surface of the workpiece flat, it is necessary to hit the hollow and use the hex socket bolt.

Difference four, the structure is not the same

Screw: A type of fastener consisting of a head and a screw, which can be classified into three categories according to their use — machine screws, setting screws, and screws for special purposes.

Bolt: A type of fastener consisting of a head and a screw (the screw refers only to the threaded part, not the same concept as the drive screw) that is fitted with a nut for fastening two parts with through holes.