| Uundaji Ulioimarishwa Awali | |||||
| Kategoria | Daraja | Vipimo | Kiwango cha utendaji | ||
| Unene | Upana (mm) | Urefu (mm) | |||
| Vyombo na vyuma vya ukungu | P20H/1.2311H/718H/1.2738H | ≥200 | 800~2000 | ≤4000 | GB/T 1299-2014 |
| 1.2312H | 800~1500 | ||||
| Uundaji Ulioimarishwa Awali | |||||
| Kategoria | Daraja | Vipimo | Kiwango cha utendaji | ||
| Unene | Upana (mm) | Urefu (mm) | |||
| Vyombo na vyuma vya ukungu | P20H/1.2311H/718H/1.2738H | ≥200 | 800~2000 | ≤4000 | GB/T 1299-2014 |
| 1.2312H | 800~1500 | ||||