Summus qualitas per virgas
| Steel Gradus | Usus | Rockweell duritia | Exsequens Standard |
| 45 (SAE1045,S45C/S48C) | Pro Grade 8.8 | HRC28-32 | GB/T 699 |
| 40Cr (SAE5140, SCr440) | Pro Grade 10.9 | HRC32-39 | GB/T 3077 |
| 35CrMo (SAE4135,SCM432/SCRRM3) | Pro Grade 12.9 | HRC39-42 | GB/T 3077 |
| 42CrMo (SAE4140, SCM440) | Pro Grade 12.9 | HRC39-42 | GB/T 3077 |
Materiam pondus et longitudinem
