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| Rockwell hardness D | |||
| Rockwell hardness, D | |||
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| Rockwell hardness C | |||
| твёрдость по Роквеллу, шкала: 25 phrases in 10 subjects |
| Drilling | 2 |
| General | 2 |
| Metallurgy | 7 |
| Military | 1 |
| Polymers | 1 |
| Quality control and standards | 4 |
| Sakhalin | 1 |
| Seismology | 2 |
| Technology | 4 |
| Transport | 1 |