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Basic knowledge of screws
2021.03.25

1. Related terms of screws


●The difference between screws, screws, bolts and fasteners.


●Common English expressions: Screw; Bolt; Fastener.


● Definition of thread: Thread is a shape with a uniform spiral protrusion on the outer or inner surface of a solid.

2. The role of thread


●Tightening and connection: suitable for most screw products at this stage.

●Transmission function (displacement effect): such as a micrometer for QC to check the size.

●Sealing effect: such as the connection sealing of the pipeline.

3. Processing method of screws


●Turning: Turn the material to the desired shape by removing the material.


Advantages: high processing accuracy, no mold restrictions.


Insufficient: high production cost and slow processing speed.


●Forging: Forging material by external force to deform it to achieve the desired shape.


Advantages: fast production speed, low cost, suitable for mass production.


Insufficient: The forming is limited by the mold, and the mold cost of complex products is high.


4. Cold heading process


●Cold heading: It is the process of squeezing and deforming the metal wire rod by external force without heating the metal wire.


●The cold heading process is only one type of forging process.


5. Commonly used raw materials for manufacturing screws


●Metal and non-metal.


●Metal: iron Fe, copper Cu, aluminum AI.


● Iron: Carbon Steel, Alloy Steel, Stainless Steel.


●The form of raw materials (wire and bar).


●Processing technology of raw materials.


●Current sources of metal materials: Japan/Korea, Taiwan, Mainland China.


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