Coach Screw 1.Material: Q235, 35# 2.Type: Ss5, Ss8, Ss25, ... , 5.6, 8.8 4.Surface: Plain, Black, Zinc, HDG Coach Screw, also named Sleeper Screw, Screw Spike or Railway Screw ... . It's a type of rail fastenings and is mainly used in rail construction. Shanghai SUYU Railway Fastener Co.,Ltd is ...