... spike,variable thread screw spike, drive spike, two-end spike, dog spike,sharp-end spike and ... bolt, square bolt, steel structure bolt, torshear type high strength plain washer, high strength bolt for ... flange bolt, bolt for carriage, handing down bolt, T type bolt, hinged bolt.B: Hex nut, square nut ... of special equipments, etc. Standards for railway products: T B, UIC , AREA, etc.Standards for standard ...