B-Thread Screws to JIS standards - hole sizes
| Nom dia. | B-thread hole size for steels - Length of thread engagement | |||||||
|---|---|---|---|---|---|---|---|---|
| 0.6 | 0.8 | 1.0 | 1.2 | 1.6 | 2.0 | 2.6 | 3.2 | |
| 2.0 | 1.54 | 1.63 | 1.67 | 1.70 | 1.73 | 1.75 | 1.79 | - |
| 2.3 | 1.85 | 1.93 | 1.96 | 1.98 | 2.02 | 2.04 | 2.09 | - |
| 2.6 | 2.04 | 2.07 | 2.17 | 2.22 | 2.26 | 2.32 | 2.34 | 2.38 |
| 3.0 | 2.34 | 2.40 | 2.44 | 2.56 | 2.62 | 2.68 | 2.72 | 2.75 |
| 3.5 | 2.70 | 2.79 | 2.86 | 2.92 | 3.07 | 3.10 | 3.18 | 3.21 |
| 4.0 | 3.12 | 3.22 | 3.27 | 3.33 | 3.51 | 3.55 | 3.63 | 3.67 |
| 5.0 | - | 4.07 | 4.17 | 4.21 | 4.38 | 4.48 | 4.58 | 4.63 |
| 6.0 | - | - | 5.00 | 5.08 | 5.22 | 5.39 | 5.51 | 5.57 |
| 8.0 | - | - | 6.77 | 6.88 | 7.00 | 7.13 | 7.36 | 7.52 |