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Enter value, select the conversion and click on calculate. Result will be displayed. Above conversions are for Austenitic Stainless Steel and formulas as per ASTM E140. HRB = Rockwell Hardness, HB = Brinell hardness
Rockwell Superficial Hardness Scales
| Scale |
Indenter Type |
Minor Load
F0
kgf |
Major Load
F1
kgf |
Total Load
F
kgf |
Value of
E |
| HR 15 N |
N Diamond cone |
3 |
12 |
15 |
100 |
| HR 30 N |
N Diamond cone |
3 |
27 |
30 |
100 |
| HR 45 N |
N Diamond cone |
3 |
42 |
45 |
100 |
| HR 15 T |
1/16" steel ball |
3 |
12 |
15 |
100 |
| HR 30 T |
1/16" steel ball |
3 |
27 |
30 |
100 |
| HR 45 T |
1/16" steel ball |
3 |
42 |
45 |
100 |
| HR 15 W |
1/8" steel ball |
3 |
12 |
15 |
100 |
| HR 30 W |
1/8" steel ball |
3 |
27 |
30 |
100 |
| HR 45 W |
1/8" steel ball |
3 |
42 |
45 |
100 |
| HR 15 X |
1/4" steel ball |
3 |
12 |
15 |
100 |
| HR 30 X |
1/4" steel ball |
3 |
27 |
30 |
100 |
| HR 45 X |
1/4" steel ball |
3 |
42 |
45 |
100 |
| HR 15 Y |
1/2" steel ball |
3 |
12 |
15 |
100 |
| HR 30 Y |
1/2" steel ball |
3 |
27 |
30 |
100 |
| HR 45 Y |
1/2" steel ball |
3 |
42 |
45 |
100 |
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