Vijiti vya ubora wa juu
| Daraja la chuma | Tumia | Ugumu wa Rockwell | Utekelezaji wa Kiwango |
| 45 (SAE1045,S45C/S48C) | Kwa Daraja la 8.8 | HRC28-32 | GB/T 699 |
| 40Kr (SAE5140,SCr440) | Kwa Daraja la 10.9 | HRC32-39 | GB/T 3077 |
| 35CrMo (SAE4135,SCM432/SCRM3) | Kwa Daraja la 12.9 | HRC39-42 | GB/T 3077 |
| 42CrMo (SAE4140,SCM440) | Kwa Daraja la 12.9 | HRC39-42 | GB/T 3077 |
Kukata nyenzo kwa uzito na urefu
