revolving nut 1.Material:mildsteel,45#steel,40Cr,35CrMo 2.Grade:4.8,8.8,10.9,12.9 3.Finish:black oxide,phospahte,zinc... MaterialGradeSurfaceSelling pointsSupply abilityCertificateSAE10454.8/8.8black oxiderealiable quality2000 tons/monthISO9001:2000SAE514010.9phosphatinggood service SCM43212.9galvanizationreasonable pricedelivery timeHRC42CrMo12.9dacromenttimely delivery35-45days/container28- ...