
Unit : mm unit: mm
Bored hole size Bored hole size Minor diameter of internal threads (D ) Bored hole size
Nominal size Size 1
( ref.) ( ref.) Max. Min.
| STI M 2 ×0.4 | 2.15 | STI No. 2 | - 56 UNC | 2.440 | 2.284 | 2.40 |
| STI M 2.5×0.45 | 2.66 | STI No. 4 | - 40 UNC | 3.180 | 2.985 | 3.13 |
| STI M 2.6×0.45 | 2.76 | STI No. 4 | - 48 UNF | 3.121 | 2.962 | 3.08 |
| STI M 3 ×0.5 | 3.18 | STI No. 5 | - 40 UNC | 3.487 | 3.315 | 3.44 |
| STI M 4 ×0.7 | 4.27 | STI No. 6 | - 32 UNC | 3.878 | 3.678 | 3.83 |
| STI M 5 ×0.8 | 5.29 | STI No. 6 | - 40 UNF | 3.817 | 3.645 | 3.77 |
| STI M 6 ×1 | 6.38 | STI No. 8 | - 32 UNC | 4.523 | 4.339 | 4.48 |
| STI M 8 ×1.25 | 8.47 | STI No. 8 | - 36 UNF | 4.498 | 4.321 | 4.45 |
| STI M10 ×1.5 | 10.56 | STI No. 10 | - 24 UNC | 5.283 | 5.055 | 5.23 |
| STI M10 ×1.25 | 10.47 | STI No. 10 | - 32 UNF | 5.184 | 4.999 | 5.14 |
| STI M10×1 | 10.38 | STI No. 12 | - 24 UNC | 5.943 | 5.715 | 5.89 |
| STI M12×1.75 | 12.66 | STI | 1/ - 20 UNC | 6.868 | 6.625 | 6.81 |
4
STI M12×1.5 12.56 STI 1/ - 28 UNF 6.720 6.546 6.68
4
STI M12×1.25 12.47 STI 5/ - 18 UNC 8.488 8.243 8.43
16
STI M14×2 14.75 STI 5/ - 24 UNF 8.351 8.167 8.31
16
STI M14×1.5 14.56 STI 3/ - 16 UNC 10.126 9.868 10.06
8
STI M14×1.25 14.47 STI 3/ - 24 UNF 9.931 9.754 9.89
8
STI M16×2 16.75 STI 7/ - 14 UNC 11.783 11.507 11.71
16
STI M16×1.5 16.56 STI 7/ - 20 UNF 11.584 11.387 11.53
16
STI M18×2.5 18.93 STI 1/ - 13 UNC 13.393 13.122 13.33
2
STI M18×1.5 18.56 STI 1/ - 20 UNF 13.172 12.975 13.12
2
STI M20×2.5 20.93 STI 5/ - 11 UNC 16.672 16.376 16.60
8
STI M20×1.5 20.56 STI 5/ - 18 UNF 16.385 16.180 16.33
8
STI M22×2.5 22.93 STI 3/ - 16 UNF 19.608 19.393 19.55
4 STI M22×1.5 22.56 STI M24×3 25.11 STI M24×1.5 24.56