What is the hardness of a Grade 8 bolt?

Materials - Medium Carbon Steel Bolts in SAE J429 (Grades 2, 5 and 8)
GradeNominal size, inchesCore hardness, Rockwell
2¾ - 11/2 inchB70 to B100
5¼ - 1 inchC25 to C34
1 - 1-1/2 inchesC19 to C30
8¼ - 1-1/2 inchesC33 to C39

Updated: 26th August 2018

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