... ,12.9 grade of Track bolt,plow bolt,segment bolt and nut We are professional manufacture of earthmoving fastener,all of ... fastener are made by high grade alloy steel,the surface hardness can reach HRC36-42,tensile strength is 170,000 P ... or sample. Except these fastener,we also can produce pins and locks,bushes for Cat,Komatsu,ESCO,JCB....If you want ...