Union bolt full thread

　　Strength: 8.8 Material: carbon steel, alloy steel

　　Material: medium carbon steel

　　Material description: C 0.42-0.50, Mn0.50-0.80，Si0.17-0.37，Cr≤0.25，Cu≤0.30，Ni≤0.30，P≤0.035，S≤0.035， It is similar to American grade 1045, Japanese grade S45C, German, British, and French C45, and ISO standard C45E4

　　Surface treatment: colored zinc

　　Surface treatment content: Galvanized, requires passivation for better corrosion resistance. Passivation with colored passivation solution can obtain colored zinc.