| 呼 び |
ドリル径 |
めねじ内径
JIS 2B
（注1） |
| Max. |
Min. |
| No. 0‐80UNF |
1.25 |
1.305 |
1.182 |
| No. 1‐64UNC |
1.55 |
1.582 |
1.425 |
| No. 1‐72UNF |
1.55 |
1.612 |
1.474 |
| No. 2‐56UNC |
1.80 |
1.871 |
1.695 |
| No. 2‐64UNF |
1.85 |
1.912 |
1.756 |
| No. 3‐48UNC |
2.1 |
2.146 |
1.941 |
| No. 3‐56UNF |
2.1 |
2.197 |
2.025 |
| No. 4‐40UNC |
2.3 |
2.385 |
2.157 |
| No. 4‐48UNF |
2.4 |
2.458 |
2.271 |
| No. 5‐40UNC |
2.6 |
2.697 |
2.487 |
| No. 5‐44UNF |
2.7 |
2.740 |
2.551 |
| No. 6‐32UNC |
2.8 |
2.895 |
2.642 |
| No. 6‐40UNF |
2.9 |
3.022 |
2.820 |
| No. 8‐32UNC |
3.4 |
3.530 |
3.302 |
| No. 8‐36UNF |
3.5 |
3.606 |
3.404 |
| No.10‐24UNC |
3.9 |
3.962 |
3.683 |
| No.10‐32UNF |
4.1 |
4.165 |
3.963 |
| No.12‐24UNC |
4.5 |
4.597 |
4.344 |
| No.12‐28UNF |
4.6 |
4.724 |
4.496 |
| No.12‐32UNEF |
4.7 |
4.826 |
4.623 |
| 1/4 ‐20UNC |
5.1 |
5.257 |
4.979 |
| 1/4 ‐28UNF |
5.5 |
5.588 |
5.360 |
| 1/4 ‐32UNEF |
5.6 |
5.689 |
5.487 |
| 5/16 ‐18UNC |
6.6 |
6.731 |
6.401 |
| 5/16 ‐24UNF |
6.9 |
7.035 |
6.782 |
| 5/16 ‐32UNEF |
7.1 |
7.264 |
7.087 |
| 3/8 ‐16UNC |
8.0 |
8.153 |
7.798 |
| 3/8 ‐24UNF |
8.5 |
8.636 |
8.382 |
|
 |
| 呼 び |
ドリル径 |
めねじ内径
JIS 2B
（注1） |
| Max. |
Min. |
| 3/8 ‐32UNEF |
8.7 |
8.864 |
8.662 |
| 7/16 ‐14UNC |
9.4 |
9.550 |
9.144 |
| 7/16 ‐20UNF |
9.9 |
10.033 |
9.729 |
| 7/16 ‐24UNS |
10.1 |
10.210 |
9.957 |
| 7/16 ‐28UNEF |
10.2 |
10.337 |
10.135 |
| 1/2 ‐13UNC |
10.9 |
11.023 |
10.592 |
| 1/2 ‐20UNF |
11.5 |
11.607 |
11.329 |
| 1/2 ‐24UNS |
11.7 |
11.811 |
11.557 |
| 1/2 ‐28UNEF |
11.8 |
11.938 |
11.710 |
| 1/2 ‐32UN |
11.9 |
12.039 |
11.837 |
| 9/16 ‐12UNC |
12.2 |
12.446 |
11.989 |
| 9/16 ‐18UNF |
12.9 |
13.081 |
12.751 |
| 9/16 ‐20UN |
13.0 |
13.208 |
12.904 |
| 9/16 ‐24UNEF |
13.2 |
13.385 |
13.132 |
| 5/8 ‐11UNC |
13.6 |
13.868 |
13.386 |
| 5/8 ‐18UNF |
14.5 |
14.681 |
14.351 |
| 5/8 ‐20UN |
14.6 |
14.782 |
14.504 |
| 5/8 ‐24UNEF |
14.8 |
14.986 |
14.732 |
| 3/4 ‐10UNC |
16.6 |
16.840 |
16.307 |
| 3/4 ‐16UNF |
17.5 |
17.678 |
17.323 |
| 3/4 ‐20UNEF |
17.8 |
17.957 |
17.679 |
| 7/8 ‐ 9UNC |
19.6 |
19.761 |
19.177 |
| 7/8 ‐14UNF |
20.5 |
20.675 |
20.270 |
| 7/8 ‐20UNEF |
21.0 |
21.132 |
20.854 |
| 1 ‐ 8UNC |
22.3 |
22.606 |
21.971 |
| 1 ‐12UNF |
23.3 |
23.571 |
23.114 |
| 1 ‐14UNS |
23.6 |
23.825 |
23.445 |
| 1 ‐20UNEF |
24.1 |
24.307 |
24.029 |
|