... ,000KM Timing ChainMaterial: Link Plate, 65Mn; Pin, SUJ2 or SCr440; Bush, 20CrMnMoProcess: Link Plate, hot treatment; Pin, carbonitriding treatmentLink Plate Surface ... , Yellowing, Copper-plated, Zinc-plated, Nickel-plated, Chrome-platedPin and Bush with polishing treatment, and pin with accurate grindingHardness: Pin, RC60 ...