Tunnel bolt, metro bolt
USD $0.85 - $0.85 /Ton
Min.Order:5000 Tons
Suzhou Suyu Railway Material Co., Ltd
Rail bolt/Metro 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