Carbon Steel Coil Spring 1) Material: 62Si2MnA, 65Mn, SK3,SK4, SK5, ... 0.1-3.0mm 3) Width: 3-80mm Carbon Steel Coil Spring1) Material: 62Si2MnA, 65Mn, SK3,SK4, SK5, ... , electrical machine ,start-up machine,etc.),constant force spring for door ,windows ,electric fans ,machines of lift ... oven,etc...).And are specialized in producing springs for various kinds of carbon and stainless steel products and ...