Rockwell Hardness Conversion Chart (HR_A-HR_C)

We make it easy for you to convert between Rockwell A (HR_A) and Rockwell C (HR_C) values.

Rockwell “A”	Rockwell “C”
91.8-92.8	79.5-81.5
91.5-92.5	79.0-81.0
90.5-91.5	77.0-79.0
90.2-91.2	76.5-79.5
89.8-90.8	75.6-77.6
89.0-90.0	74.0-76.0
88.5-89.5	73.0-75.0
88.0-89.0	72.0-74.0
87.5-88.5	71.0-73.0
87.0-88.0	71.0-72.0
86.0-87.0	69.0-71.0
83.0-84.5	63.0-66.0
81.5-83.0	61.0-63.0

← Hardness Conversion Scales

← Resource Center

Rockwell Hardness Scale (PDF)

Vickers Hardness Scale (PDF)

← Hardness Conversion Scales