1. Tooth front and pitch of comparison items:
2. According to the standard naked eye, the teeth are sharp, evenly spaced and bright.
3. Hand feeling: the tooth front is smooth, the processing depth is standardized, the core wall is uniform, and the flow parts are smooth.
4. It has been mechanically treated before leaving the factory, and the surface is free of inclusions and debris.
5. Low carbon content, corrosion resistance, oxidation resistance, strong toughness, and strong resistance to pressure.
6. Rough construction, unfavorable and thick tooth front, irregular tooth pitch, occasional damage to the tooth front, and easy water leakage
7. The thread can't see the luster, and the dark feel is bad.
8. The core is crooked, the wall thickness is uneven, and the fluid is easy to block after the flow.
9. Coarse, untreated surface, easy to be oxidized
10. High carbon content, not resistant to corrosion, poor toughness, and weak tensile strength.
