... fastener,all of our bolt and nut made by 40Cr or 35CrMo,hardness HRC38-42 We have 8.8,10. ... nut,segment bolt and nut.Besides the OEM parts,we also accept customer's drawing or samples.Grade 8.8 120, ... bolt and nut,from diameter 7/16'' to 1 1/4'',from M12 to M27,if you have any inquiry,please ... feel free to send here.Thank you ! 8.8-12.9 Grade of track bolt with nut for excavator