... spike, two-end spike, dog spike,sharp-end spike and coach screw (rail fasteners)A: B:Elastic bar, lock washer, fishplate ... square nut, hex flange nut, slotted nut, high strength nut for bolt.3 Fastener Spring washer, flat washer, split pin4 Anti ... -loosen, screw anti-loosen types)5 Various Standard components: Fasteners for motor, diesel engine, mechanical vehicle, petrochemicals, and electric power, ...