1. Load-bearing capacity: Select bolts of corresponding strength according to the weight and strength of the object being carried.
2. Perforation diameter: Select appropriate bolts according to the required perforation diameter.
3. Pitch: The pitch is the distance of the thread. Select the appropriate pitch according to the required torque and speed.
4. Environmental conditions: Select bolts of corresponding materials according to the temperature, humidity, corrosion, etc. of the use environment.
5. Polymer materials: For polymer materials, bolts developed for polymers need to be selected.