... Coil Spring 1) Material: 62Si2MnA, 65Mn, SK3,SK4, SK5, SUS301,304 2) Thickness: 0.1-3.0mm 3) Width: 3-80mm Carbon ... , gas, diesel oil , electrical machine ,start-up machine,etc.),constant force spring for door ,windows ,electric fans ,machines of lift and down ... ...).And are specialized in producing springs for various kinds of carbon and stainless steel products and supplies high elastic and heat ...