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1.torsional spring are helically wound springs which exert a torque or force in a radial direction.

2.Applications for torsional spring vary from the ordinary door hinge to the drive mechanism of locks. Each must be separately considered.

3.High service-life torsional spring have good hardness resistance to both high and low temperatures.
4.Surface Treatments of the torsional spring: Zinc Plating,Chrome Plating,Nickel Plating,etc.

5.OEM/ODM is welcome.