1.raw material:40Cr,35CrMo 2.mechanical grade :8.8,10.9,12.9 3.size:1/2-1.1/4;M12-M36 4.case hardening:HRC29-HRC36 excavator parts square nut1.raw material:40Cr,35CrMo2.mechanical grade :8.8,10.9,12.93.size:1/2-1.1/4;M12-M364.case hardening:HRC29-HRC36A.Factory information: China Minda Machine Manufacturing Co.,ltd B. Quality CertificateC.Detailed DescriptionMaterial40Cr/35CrMoGrade8.8/10.9/12. ...