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, SUS301 ... , electrical machine ,start-up machine,etc.),constant force spring for door ,windows ,electric fans ,machines of lift and ... are widely use all kinds of home appliances uesed auto recover of wire (ie. Vacuum Cleaner, electric cooker ...