The strength classification below is divided into four levels: I, II, III, and IV. The classification principle is to evaluate the bellows' wall thickness, outer diameter, pressure resistance, and other parameters. The higher the grade, the greater the strength. The specific classification is as follows:
1. I grade: The bellows wall thickness is 0.2mm, the outer diameter is 8mm, and the pressure resistance is 1.0MPa and below.
2. II grade: The bellows wall thickness is 0.25mm, the outer diameter is 10mm, and the pressure resistance is 1.0-2.0MPa.
3. III grade: The bellows wall thickness is 0.3mm, the outer diameter is 12mm, and the pressure resistance is 2.0-3.0MPa.
4. IV grade: The bellows wall thickness is 0.35mm and above, the outer diameter is 14mm and above, and the pressure resistance is 3.0MPa and above.

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