... , stud, timber spike, hexagon flange bolt, bolt for carriage, handing down bolt, T type bolt, hinged bolt.B: Hex nut, square nut ... , hex flange nut, slotted nut, high strength nut for bolt. 3 ... full set of special equipments, etc. Standards for railway products: T B, UIC , AREA, etc. Standards for standard components: GB, DIN, ASTM/ANSI ...