Carbon Steel Coil Spring 1) Material: 62Si2MnA, 65Mn, SK3,SK4, ... 0.1-3.0mm 3) Width: 3-80mm Carbon Steel Coil Spring1) Material: 62Si2MnA, 65Mn, SK3,SK4, SK5, ... a professional manufacturer specialized in producing all classes of springs for Industrial machine,(ie. garden hose reels, balancer ... fan, oven,etc...).And are specialized in producing springs for various kinds of carbon and stainless steel ...