布氏钢球压头技术条件
| 球直径mm | 极限偏差mm | 硬度值不低于HV10 |
| 10 | ±0.005 | 850 |
| 5 | ±0.004 | 850 |
| 2.5 | ±0.003 | 850 |
| 2 | ±0.003 | 850 |
| 1 | ±0.003 | 850 |
洛氏用钢球压头技术条件
| 洛氏硬度标尺 | 钢球直径mm | 直径允差mm | 圆度允差mm |
| B、F、G | 1.5875 | ±0.002 | 0.002 |
| E、H、K | 3.175 | ±0.004 | 0.004 |
