T C Bolt, 1.Carbon Steel,SS,Alloy etc 2.M16-M30,Zinc,Black,etc 3 ... according to the request of customers;2.Material:Carbon steel or alloy steel;3.Standard: DIN,ANSI,ASME,ASTM,IFI,JIS ... galvanizing,Dacromet,etc;6.Usage: steel structures,such as multi-floor&high-rise steel structure buildings, wind turbine, industrial ... price. Welcome your inquiries! Tension Control Structural Bolt/Nut/Washer Assemblies