12.9 Grade of segment bolt and nut,9W9265-8H5724,3S8182-7H3607,3S0336-7H3608,5P0233-2M5656,7T1248-7H3609,1542712320-0180332228 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 ...