下表為各種洛氏硬度能測最小厚度及最低硬度的組合
| 硬度 H | ▽120°圓錐鑽石 | φ1/16in 鋼球 | φ1/16in 鋼球 | φ1/8in 鋼球 | |
|---|---|---|---|---|---|
| A.C.D 10×0.002（100−H） |
15N.30N.45N 10×0.001（100−H） |
15T.30T.45T 15×0.001（100−H） |
B.F.G 15×0.002（130−H） |
E.H.K | |
| 100 | – | – | – | 0.9 | |
| 95 | 0.1 | 0.05 | 0.075 | 1.05 | |
| 90 | 0.2 | 0.1 | 0.15 | 1.2 | |
| 85 | 0.3 | 0.15 | 0.225 | 1.35 | |
| 80 | 0.4 | 0.2 | 0.3 | 1.5 | |
| 75 | 0.5 | 0.25 | 0.375 | 1.65 | |
| 70 | 0.6 | 0.3 | 0.45 | 1.8 | |
| 65 | 0.7 | 0.35 | 0.525 | 1.95 | |
| 60 | 0.8 | 0.4 | 0.6 | 2.1 | |
| 55 | 0.9 | 0.45 | 0.675 | 2.25 | |
| 50 | 1.0 | 0.5 | 0.75 | 2.4 | |
| 45 | 1.1 | 0.55 | 0.825 | 2.55 | |
| 40 | 1.2 | 0.6 | 0.9 | 2.7 | |
| 35 | 1.3 | 0.65 | 0.975 | 2.85 | |
HRC、HRA、HRD測圓筒面應加補償值：
| 硬度 測定值 |
圓筒面半徑（mm） | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 3 | 5 | 6.5 | 8 | 9.5 | 11 | 12.5 | 16 | 19 | ||
| 20 | – | – | – | 2.5 | 2.0 | 1.5 | 1.5 | 1.0 | 1.0 | |
| 25 | – | – | 3.0 | 2.5 | 2.0 | 1.5 | 1.0 | 1.0 | 0.5 | |
| 30 | – | – | 2.5 | 2.0 | 1.5 | 1.0 | 1.0 | 0.5 | 0.5 | |
| 35 | – | – | 3.0 | 2.0 | 1.5 | 1.5 | 1.0 | 0.5 | 0.5 | |
| 40 | – | 2.5 | 2.0 | 1.5 | 1.0 | 1.0 | 0.5 | 0.5 | 0.5 | |
| 45 | 3.0 | 2.0 | 1.5 | 1.0 | 1.0 | 0.5 | 0.5 | 0.5 | 0.5 | |
| 50 | 2.5 | 2.0 | 1.5 | 1.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| 55 | 2.0 | 1.5 | 1.0 | 1.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| 60 | 1.5 | 1.0 | 1.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| 65 | 1.0 | 1.0 | 1.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| 70 | 1.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| 75 | 1.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| 80 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| 85 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| 90 | 0.5 | 0.5 | 0.5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | |