
| Main size | designatio | n and spec | ification | |||||
| ① metric | ② unified | L | `ℓ` | `ℓ`n | `ℓ`s (reference) | Ds | K | `ℓ`k |
| M2×0.4 | 45 | 8 | - | 32 | 2.8 | 2.1 | 5 | |
| M2.2×0.45 | 45 | 9 | - | 32 | 2.8 | 2.1 | 5 | |
| M2.3×0.4 | 45 | 9 | - | 32 | 2.8 | 2.1 | 5 | |
| M2.5×0.45 | 50 | 8 | 15 | 33 | 2.8 | 2.1 | 5 | |
| M2.6×0.45 | 50 | 8 | 15 | 33 | 2.8 | 2.1 | 5 | |
| M3×0.5 | `№`4-40UNC `№`4-48UNF | 56 | 9 | 18 | 34 | 3.5 | 2.7 | 6 |
| M3.5×0.6 | `№`6-32UNC `№`6-40UNF | 56 | 11 | 20 | 32 | 4 | 3 | 6 |
| M4×0.7 | `№`8-32UNC `№`8-36UNF | 63 | 13 | 21 | 38 | 4.5 | 3.4 | 6 |
| M4.5×0.75 | `№`10-24UNC `№`10-32UNF | 70 | 14 | 24 | 39 | 6 | 4.9 | 8 |
| M5×0.8 | 70 | 14 | 25 | 39 | 6 | 4.9 | 8 | |
| M6×1 | 80 | 15 | 30 | 45 | 6 | 4.9 | 8 | |
| 1/4-20UNC 1/4-28UNF | 80 | 15 | 30 | 42 | 7 | 5.5 | 8 | |
| M8×1.25 | 5/16-18UNC | 90 | 19 | 35 | 47 | 8 | 6.2 | 9 |
| 3/8-16UNC | 100 | 23 | 39 | 54 | 9 | 7 | 10 | |
| M10×1.5 | 100 | 23 | 39 | 52 | 10 | 8 | 11 |