... 8,10.9,12.Bolts and nuts:Mechanical Properties1, Material: 40 Cr.2, Tensile strength: Mpa quartile 1220 (magnitude 12.9) ... to the international standards including ANSI, ASTM (America), DIN (Germany), GB (China), UNI, JIS (Japan), ISO and TCVN (Vietnam). steel ... bolts & nutsstandardASTM, BS, UIC864-1, JIS, GOST, DIN, AS, GB and so on.sizesAccording to clientsClassAccording to clientsShape of headSquare ...