... 55CrSi(SAE9254V) 60Si2MnA· Usage: engine valve spring, clutch spring, oil pump nozzle spring· Diameter: 0.7mm-8.0mm· Certificate: ... for engine valve spring, clutch spring, oil pump nozzle spring, auto belt tightening pulley spring. And supporting spring in piston ring ... quenching steel, die with spring steel wire, twist spring wire, spring wire, spring wire, tension spring steel wire, used for ...