8.8,10.9,12.9 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 alloy steel,the surface hardness can reach HRC36-42,tensile strength is 170,000 P.S.I.There are 10.9,12.9 class of track bolt and nut,plow bolt and nut,segment bolt with nut,wheel bolt and nut.Also we could produce according to your ...