... 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 ... -loosen types)5 Various Standard components: Fasteners for motor, diesel engine, mechanical vehicle, petrochemicals, ... equipments, etc. Standards for railway products: T B, UIC , AREA, etc. Standards for standard components: GB, ...