Type 1 all metal hexagonal locking nut (three-point compression)

　　Strength: 8 Material: carbon steel, alloy steel
　　Material: medium carbon steel
　　Material description: C 0.32-0.39, Mn0.50-0.80，Si0.17-0.37，Cr≤0.25，Cu≤0.25，Ni≤0.30，P≤0.035，S≤0.035， It is similar to American grade 1035, Japanese grade S35C, German, English, and French grade C35, and ISO standard C35E4
　　Surface treatment: trivalent blue white zinc
　　Surface treatment content: functional rust prevention, decoration, and improvement of corrosion resistance. Suitable materials for various types of steel parts. The appearance of the coating is blue and white according to the ASTM-B633-98 environmental protection standard. The neutral salt spray test is 96h and there is no red rust