compression spring professional manufacturer OEM service with competitive price high quality and quick delivery&ISO9001:2008 Industrial compression spring ,electric lift spring ,Specifications:1.ISO9001:20082.Material:60Si2CrA,60Si2CrVA,60Si2MnA,stainless steel .3.Wire diameter:1mm~80mm4.Free height:15mm~1088mm5. hardness:42HRC~52HRC or as Standards of EN ,DIN.etc.6. Direction of coils:Right, ...