... .4mm~80mm 4.OEM and Customize stainless steel compression helical springs Details as follows: Material55CrSi,60Si2Mn,60Si2MnA ... Tons. (per pc.)ApplicationExcavator, Digger Machine, Vehicle, Motorcycle, Train, Ship, Shakeout Machine, Oscillation Absorber, etc.Painting and Coating ... , Red, Yellow, Gray, etc.Production MethodHot Formed,Cold FormedNoteThe materials and specifications can be decided by the ...