... . 4Certificate:ISO9001:2008,SGS AS M20*145 railway sleeper screw/ fastners bolts nuts screws Details of the product:1Materials: Carbon steel2Size: M20*145 ... 3Standard: AS, (ASME, DIN,J IS, GB, ISO, BS, ANSI, etc . )4Grade: 4.6, 5 ... are being used. We exported to world markets, such as U.S.A., Canada, Cuba, Germany, Japan, Singapore, Malaysia and Africa ...