... plactic tuber Railway FastenersA: Railway bolt, square head screw spike, T type bolt, 70 rail spike, spiral spike, dog spike, turnout ... spike, hexagon flange bolt, bolt for carriage, handing down bolt, T type bolt, hinged bolt.B: Hex nut, square nut, hex flange nut ... full set of special equipments, etc. Standards for railway products: T B, UIC , AREA, etc. Standards for standard components: GB, DIN, ...