... Stronger Hardness, Abrasion Resistant, Corrosion Resistant. Standard Punch. Misumi standard Coil Springs Material60Si2MnA,60Si2CrA,60Si2CrV,etcWire diameter5mm~80mmFree hight10mm~1188mmhardness42HRC~52HRCDirection ... -Heavy Load)ApplicationExcavator, digger machine, car, train, shakeout machine,Steel Plants,Railway Bogies & Wagons,,etc.Painting and Coating Amino paint,Synthetic Enamel Paint ...