... Hardness, Abrasion Resistant, Corrosion Resistant. Standard Punch. Misumi standard Coil Springs Material60Si2MnA,60Si2CrA,60Si2CrV,etcWire diameter5mm~80mmFree hight10mm~1188mmhardness42HRC~52HRCDirection of ... coilsDeted By Drawing / Data.Load Bearing Capacity Yellow( Lightest Load ) Blue(Light Load ) Red(Medium Load )Green(Heavy Load) Brown(EX-Heavy Load)ApplicationExcavator, digger machine, car ...