... 12.9 grade of Track bolt,plow bolt,segment bolt and nut We are professional manufacture of earthmoving fastener,all of ... our fastener are made by high grade ... There are 10.9,12.9 class of track bolt and nut,plow bolt and nut,segment bolt with ... these fastener,we also can produce pins and locks,bushes for Cat,Komatsu,ESCO,JCB.... ...