First grade ,Alloy steel ,12.9 Bolt/nut for for Construction machine: ... ,Dawoo , 1.Product imformation:1)raw material:40CR,35CRMO 2)Grade:10.9,12.9 3)Finish color: grey, black 4 ... ,572,583186V1792+1S1860955,963,973,977191S8804/154-32-11210D80A-8 Sell 40Cr 12.9 grade high strength bolt and nut