... steel 3.heat treatment 4.ISO 9001 excavator bucket Quality System CertificateISO 9001Dimension ToleranceCT7Surface RoughnessRa6.4~12.5Casting Weight0.05~500KGAnnual ... tons per yearInspection Chemical Composition Analysis, Tensile Test, Dimension Inspection, Hardness TestingSurface TreatmentHeat Treatment, Machine, Polishing, Chrome, Zinc, Nickel PlatingPackingCartons, Wooden ...