... /4'' We are professional manufacture of earthmoving fastener,all of our fastener are made by high grade alloy steel,the surface hardness can ... .I. There are 10.9,12.9 class of track bolt and nut,plow bolt and nut,segment bolt with nut,wheel bolt ... or sample. Except these fastener,we also can produce pins and locks,bushes for Cat,Komatsu,ESCO,JCB....If you want ...