What is the difference between bolts and screws

Different definitions of bolts and screws
Bolts: Bolts are cylindrical threaded fasteners that are paired with nuts during use. It is mainly used to fasten and connect two parts with through holes. This connection form is called bolt connection.
Screws can also be called screws. A screw is a tool that uses the physics and mathematics principles of the oblique circular rotation of the object and the friction force to cyclically fasten objects and parts. The set screw is used to fix the relative position of the machine parts. Screw the set screw into the screw hole of the part to be tightened, and press its end against the surface of another part, that is, fix the former part on the latter part.

Bolts and screws have different shapes and structures

Bolt: A type of fastener consisting of a head and a screw (cylinder with external threads). The head is mostly hexagonal, which is generally larger.
Screw: A type of fastener composed of two parts: a head and a screw. The heads are mostly flat and cross grooves, and there are many internal and external hexagons, which are generally small.

Bolts and screws have different applications

Bolts: Generally used in pairs with nuts, for through holes, easy to replace after damage.
Screws: usually do not need a nut, directly matched with two objects (generally, the connecting piece needs to be drilled and tapped), which is mostly used for blind holes, and the connected piece is rarely removed.

Bolts and screws use different tools

Bolts generally use wrench-like tools.
Screws generally use screwdriver tools.

The tightening of bolts and screws is different

Bolts are generally used in conjunction with nuts or screwed into machined bolt holes.
In addition to the two fastening methods of bolts, there are self-tapping screws, which are directly screwed into a soft workpiece without processing bolt holes. For example, the wood screw we call is this kind of screw

The use of bolts and screws are different

Bolts and screws are used in different places. Bolts do not require high precision. Unless there is a matching requirement, bolts are generally easy to disassemble, have low machining accuracy, and are not limited by connecting materials. They are widely used. Bolts that require matching can withstand transverse directions. Load: The screw is compact in structure, but cannot be disassembled frequently and cannot withstand large forces.