... , two-end spike, dog spike,sharp-end spike and coach screw (rail fasteners)A: B:Elastic bar, lock washer ... mechanical anti-loosen, screw anti-loosen types)5 Various Standard components: Fasteners for motor, diesel engine, mechanical vehicle, petrochemicals, ... and electric power, etc. 6 Mechanical processing components thread spinner fittings, auto fittings, and full set of special ...