12.9 grade of plow bolt and nut from 5/8'' to 1 1/4'' We are ... earthmoving fastener,all of our fastener are made by high grade alloy steel,the surface hardness can reach HRC36-42,tensile ... 9 class of track bolt and nut,plow bolt and nut,segment bolt with nut,wheel bolt and nut.Also we could ... sample. Except these fastener,we also can produce pins and locks,bushes for Cat,Komatsu,ESCO,JCB....If you want ...