
■ Unit : mm Unit : mm
| Size | Minor diameter of internal threads (D1) | Bored hole size ( ref.) |
| 18.1 | ||
| 18.6 | ||
| 19.09 | ||
| 19.6 | ||
| 20.1 | ||
| 20.6 | ||
| 21.09 | ||
| 21.1 | ||
| 22.1 | ||
| 22.6 | ||
| 23.09 | ||
| 23.1 | ||
| 23.6 | ||
| 24.09 | ||
| 24.6 | ||
| 24.1 | ||
| 25.1 | ||
| 25.6 | ||
| 26.09 | ||
| 26.1 | ||
| 26.6 | ||
| 27.09 | ||
| 26.6 | ||
| 27.1 | ||
| 28.1 | ||
| 28.6 | ||
| 29.09 | ||
| 30.1 | ||
| 30.6 | ||
| 29.6 | ||
| 30.1 | ||
| 31.1 | ||
| 31.6 | ||
| 33.6 | ||
| 32.1 | ||
| 33.1 | ||
| 34.1 | ||
| 34.6 |
| Size | Minor diameter of i | nternal threads (D1) | Bored hole size ( ref.) |
| 36.6 | |||
| 35.1 | |||
| 36.1 | |||
| 37.1 | |||
| 37.6 | |||
| 37.1 | |||
| 38.1 | |||
| 38.6 | |||
| 37.6 | |||
| 38.1 | |||
| 39.1 | |||
| 40.1 | |||
| 40.6 | |||
| 40.6 | |||
| 41.1 | |||
| 42.1 | |||
| 43.1 | |||
| 43.6 | |||
| 43.1 | |||
| 44.1 | |||
| 45.1 | |||
| 46.1 | |||
| 46.6 | |||
| 47.1 | |||
| 48.1 | |||
| 48.6 | |||
| M52×5 | 47.297 | 46.587 | 47.1 |
| M52×4 | 48.270 | 47.670 | 48.1 |
| M52×3 | 49.252 | 48.752 | 49.1 |
| M52×2 | 50.210 | 49.835 | 50.1 |
| M52×1.5 | 50.676 | 50.376 | 50.6 |
| M55×4 | 51.270 | 50.670 | 51.1 |
| M55×3 | 52.252 | 51.752 | 52.1 |
| M55×2 | 53.210 | 52.835 | 53.1 |
| M55×1.5 | 53.676 | 53.376 | 53.6 |
| M56×5.5 | 50.796 | 50.046 | 50.6 |
| M56×4 | 52.270 | 51.670 | 52.1 |
| M56×3 | 53.252 | 52.752 | 53.1 |
| M56×2 | 54.210 | 53.835 | 54.1 |
| M56×1.5 | 54.676 | 54.376 | 54.6 |