... properties:GB/T10433, DIN, EN ISO,AN 1) High strength types of bolts and nuts use: Apply to railway and ... railway and highway bridge,bolier steel structure,industrial workshop,high-rise civil building,tower Mast structure,lifting machinery and ... requirements,carry out "o" defect management, ensure the products of our company are quality,realiby,safety. 3) specifications and packing style1 surface ...