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compression spring Wire Size Range: 0.1-20mm Materialmusic wire, spring steel, stainless steel, phosphor bronze, brass, chrome vanadium, as well as any other required. FinishesZinc plate, black oxide, shot peen,, as well as any other required. A compression spring is an open-wound helical spring that exerts a load or force when compressed. The most common and least expensive form has closed ends that are unground. "Squared and ground" ends are used when there is a need for springs that stand upright without tipping. The Conical spring is one form of compression spring, tapering from top to bottom in the form of a cone. It is used in preference to a typical compression spring when there are requirements for such features as small Solid Height, variable Spring Rates, better lateral stability and reduced vibration or resonance. OEM and ODM are welcome. We can produce spring according to drawing, samples. If you demand such these, please contact me.