ユニファイねじ用(No. 0‐80UNF〜1‐20UNEF)
(注1)UNEF、UN、UNSの2Bめねじ内径はANSI B1.1によっています。
単位 mm
  シタアナドリル径 めねじ内径
呼 び JIS 6H(2級)
(注1) (注2)
  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 1.8 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 2.74 2.551
No. 6‐32UNC 2.8 2.895 2.642
No. 6‐40UNF 2.9 3.022 2.82
No. 8‐32UNC 3.4 3.53 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 5.36
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 8.153 7.798
3/8 ‐24UNF 8.5 8.636 8.382
3/8 ‐32UNEF 8.7 8.864 8.662
7/16 ‐14UNC 9.4 9.55 9.144
7/16 ‐20UNF 9.9 10.033 9.729
7/16 ‐24UNS 10.1 10.21 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 11.71
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 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 16.84 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 20.27
7/8 ‐20UNEF 21 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