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zinc plated torsion spring Most torsion springs are made of round wire with straight legs.Henp Spring manufacturescustom torsion springs in different lengths and degrees of tension to suit yourspecifications. product category compression spring,extension spring,torsion spring,shaped spring,wire product Wire Diameter We manufacture extension springs with a wire diameter of 0.08mm to 14.0mm Wire Selection rectangular, round, square or special-section. Round being the most adaptable. Wire Material carbon steel,stainless steel, manganese steel wire, nickel wire, galvanized wire,alloys arethe most common materials we use to manufacture extension springs Applications Our torsion springs go into many applications for diverse industries that require highquality coil springs,auto, motorcycle, electronics, machinery, sports goods, equipment, toys,etc surface treatment spray-painted,zinc,nickel,chrome,gold,silver,tin,etc