First grade quality. Alloy steel. 12.9 grade . High strength. Had been ... countires. 1.Product imformation: The mechanical grade is 12.9, case hardening HRC 38-42, Material is ... : NAME OF SAMPLEPLOW BOLTDESCRIPTIONDIAMETER >16MARKS RAW MATERIAL40CrGRADEGRADE:12.9QUANTITY4NBISJB/T 5932.5-1991THE BOLT IS USED ... 195-32-11210,D85,D65,D6C,D8K Sell 40Cr high strength 12.9 grade plow bolt cutting edge bolt ...