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Rockwell Blocks
Diameter
Nominal Hardness Values
Variation
NIST Traceable
HRA
64mm
56, 65, 71, 75, 78, 81, 83, 85, 87
+/-0.3
No
HRB
32, 42, 52
+/-0.5
62, 72, 82, 90, 95, 100
+/-0.4
HRC
10, 20, 25, 30, 35, 40
+/-0.15
Yes
45, 50, 55, 60, 62, 64, 67, 70
+/-0.1
HR15N
75, 80, 85, 87, 90, 92
+/-0.45
HR30N
41, 50, 60, 67, 73, 78, 81, 83
HR15T
78, 82, 87
HR30T
32, 42, 52, 62, 72, 78
HRE
90
HRL
92, 118
HRM
67, 107
HRR
105, 123
51mm
20, 25, 30, 35, 40, 45
50, 55, 60, 62, 64, 67