... nut We are professional manufacture of earthmoving fastener,all of our fastener are made by high grade alloy steel,the surface hardness can ... P.S.I. There are 10.9,12.9 class of track bolt and nut,plow bolt and nut,segment bolt ... Cat,Komatsu,ESCO,JCB....If you want to know more of our products,please feel free to contact with us,we ... reply you as soon as possible. 12.9 grade of earthmoving bolt and nut