Rail tunnel bolt, metro bolt
Product Description
Rail bolt/Metro bolt/Tunnel bolt
Standard: UIC, DIN, BS, ASTM
Raw material: Q235, 35K, 45#, 40Mn2, 20MnSi, 35CrMo, 40Cr, 42CrMo, etc
Grade: 4.6, 4.8, 5.6, 8.8, 10.9, 12.9
Surface: plain (oil), black, zinc, hdg, etc
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