Types of screws can be classified in many ways, such as their use, shape, and material.
Classification by use
Self-tapping screws: Suitable for thin sheet materials such as metal and plastic, can be drilled and tapped directly on the material, and are often used to connect thin sheet materials.
Machine screws: Need to drill holes in the material first and then screw in, usually used in steel structure construction and equipment manufacturing and other fields.
Wood screws: Mainly used to connect wooden products such as furniture, doors and windows.
Set screws: A tightening effect is achieved by screwing into the hole in the material, and is often used in automobiles and mechanical equipment and other fields.
Eyebolt screws: Used for load-bearing during installation and transportation, cannot be tightened with tools, and loads perpendicular to the plane of the eyebolt are not allowed to act on it.
Classification by shape
Round head screws: The head is round, and is often used in furniture and wood products and other fields.
Cone head screws: The head is conical, and is mainly used in steel structure construction and equipment manufacturing.
Semi-circular head screws: The head is semi-circular, and is commonly used in automobiles and mechanical equipment and other fields.
Countersunk screw: The head is flat and is mainly used in furniture and wood products.
Hexagonal screw: The head is hexagonal, which is convenient for loading and unloading with a wrench. It is often used in mechanical equipment and electronic products.
Classification by material
The materials of screws include carbon steel, stainless steel, alloy steel, copper, aluminum, etc. Different materials have different strengths and corrosion resistance and are suitable for different working environments.
Common types and their uses
Slotted ordinary screws: Used for connecting smaller parts, there are pan head screws, cylindrical head screws, semi-countersunk screws and countersunk screws.
Hexagon socket and hexalobular socket screws: Suitable for connections that require compact structure and smooth appearance.
Cross slot ordinary screws: Similar to slotted ordinary screws, but the slot strength is higher and the appearance is beautiful.
Self-tapping locking screws: With self-tapping action and high locking performance, they are often used to connect thinner metal plates.
These classifications and types allow screws to find suitable solutions in various application scenarios.
