... 4.Surface:Smooth,Double Grooved alloy spring steel barSpecification1) Grade:60Si2Mn,SUP7,55CrMnA,SUP9,50CrVA,SUP10,65Mn2) Standard: JIS G4801:2005, GB/T ... character of high quality and competitive price.According to customers' requirements, we can produce nonstandard customized sizes of width, lenght and thickness.With excellent ...