Classification of Bolts

1.Sort by head shape:

(1)Hexagonal head bolt: This is the most common type of bolt. Its head is hexagonal, and it can be easily tightened or loosened with a hex wrench. Widely used in various industries such as mechanical manufacturing, automotive, and construction, such as the connection of automotive engine cylinder blocks.

DIN6914蓝白5

 

(2)Countersunk bolt: Its head is conical and can completely sink into the surface of the connected part, making the connection surface flat. This type of bolt is very practical in situations where appearance is required, such as in the assembly of some furniture, countersunk bolts are used to ensure a smooth and beautiful surface.

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(3)Pan head bolt: The head is disc-shaped, more aesthetically pleasing than hexagonal head bolts, and can provide a larger contact area when tightened. It is often used for connection parts that require high appearance requirements and also need to withstand certain tensile forces, such as fixing the outer shell of electrical equipment.

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2.Classified by thread profile
(1)Coarse thread bolt: Its thread pitch is larger and the thread angle is also larger, so compared to fine thread bolt, its self-locking performance is slightly worse, but it has high strength and is easy to disassemble. In some situations where high connection strength is required and high precision is not necessary, such as in building structural connections, it is often used.
(2)Fine thread bolt: Fine thread bolt has a small pitch and a small thread angle, so it has good self-locking performance and can withstand large lateral forces. It is commonly used in situations that require precise connections or withstand vibration and impact loads, such as the assembly of precision instruments.

3.Classified by performance grade
(1)Ordinary 4.8 bolts: have a lower performance level and are generally used in situations where the connection strength requirements are not particularly high, such as some ordinary furniture assemblies, simple metal frame connections, etc.
(2)High strength bolts: They have high strength and are usually used for structural connections that can withstand large tensile or shear forces, such as steel structure buildings, large bridges, heavy machinery, etc., to ensure the safety and stability of the structure.


Post time: Dec-18-2024