... :GB/T10433, DIN, EN ISO,AN 1) High strength types of bolts and nuts use: Apply to railway and highway bridge ... kindlyinform us of the standard,size,surface treament and other requirement.2)we will give you some advice for reference about packing ... qualitytechnical requirements,carry out "o" defect management, ensure the products of our company are quality,realiby,safety. 3) specifications and packing ...