... nuts screws: 1Materials:steel 2Size:M20*145 3Standard:AS. 4Certificate:ISO9001:2008,SGS AS M20*145 railway sleeper screw/ fastners bolts nuts ... Details of the product:1Materials: Carbon steel2Size: M20*145 3Standard: AS, (ASME, DIN,J IS, GB, ISO, BS, ANSI, etc . )4Grade ... they are being used. We exported to world markets, such as U.S.A., Canada, Cuba, Germany, Japan, Singapore, Malaysia and ...