... carbon steel 3)Mechanical properties:GB/T10433, DIN, EN ISO,AN 1) High strength types of bolts and nuts use: Apply to railway ... price referring to your detail request.So please kindlyinform us of the standard,size,surface treament and other requirement.2) ... requirements,carry out "o" defect management, ensure the products of our company are quality,realiby,safety. 3) specifications and packing ...