1. Requirements for fastener materials in terms of mechanical function, especially strength.

2. The requirements of the working conditions on the anti-corrosion function of the material.

3. The requirements of the operating temperature on the heat-resistant function of the material (high temperature, strength, anti-oxidation function).

4. Requirements for material processing functions in terms of production technology.

5. Other aspects, such as weight, price, and purchase factors, must be considered.

After considering these five aspects in a multi-faceted and generalized manner, it finally confessed to choose the trademark, variety, standard, and material standard of fasteners.