... 1Materials:steel 2Size:M20*145 3Standard:AS. 4Certificate:ISO9001:2008,SGS AS M20*145 railway sleeper screw/ fastners bolts nuts screws Details ... they are being used. We exported to world markets, such as U.S.A., Canada, Cuba, Germany, Japan, Singapore, ... head, square head, wabbler head screw, dog spike.Railway bolts: T-bolt, Fish bolt, Track bolt, Square bolt, Rail anchor bolt, etc. Nuts: Hex head, ...