... spike, dog spike,sharp-end spike and s hex head screw spike(screw spike)A: B: ... , nylon yarn, rubber foot.2 Standard componentsA: Hex bolt, square bolt, steel structure bolt, torshear type ... carriage, handing down bolt, T type bolt, hinged bolt.B: Hex nut, square nut, hex flange nut, slotted nut ... of special equipments, etc. Standards for railway products: T B, UIC , AREA, etc. Standards for standard ...