... various types of high strength bolts used in the construction or maintainning of railway, subway and bridges. Shanghai Suyu Railway Fasteners Co., ... , T-bolts, fish bolts, switch & crossing bolts, high tensile strength bolts for rail bridges etc.3, Various type and sizes ... , welded shoulders and rail anchors.5, Standard fasteners.6, Nuts, flat washers and spring washers, plastic pads, nylon insulator, ...