... 3.material:carbon steel,alloy steel 4.OEM are welcome wheel gear for loaders Quality System CertificateISO 9001Dimension ToleranceCT7Surface RoughnessRa6.4~12 ... Composition Analysis, Tensile Test, Dimension Inspection, Hardness TestingSurface TreatmentHeat Treatment, Machine, Polishing, Chrome, Zinc, Nickel PlatingPackingCartons, Wooden Case, Steel Cases, PalletsAdvantage1 ...