... spike, dog spike,sharp-end spike and so on railway fastener(screw spike)A: B:Elastic bar, lock washer, fishplate, ... flange nut, slotted nut, high strength nut for bolt.3 Fastener Spring washer, flat washer, split pin4 Anti-loosen Fasteners ... -loosen, mechanical anti-loosen, screw anti-loosen types)5 Various Standard components: Fasteners for motor, diesel engine, mechanical vehicle, petrochemicals, ...