... .9 grade of Track bolt,plow bolt,segment bolt and nut We are professional manufacture of earthmoving fastener,all of our ... 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 ... soon as possible. 12.9 grade of earthmoving bolt and nut