RECOMMENDED TAP DRILL HOLE SIZE
Nominalsize |
Drill dia |
JIS Class 2drillholedia |
JIS Class 2internal thread minor dia |
|
Min |
Max |
|||
M2×0.4 |
1.6 |
1.65(80%) |
1.567 |
1.679 |
M2.2×0.45 |
1.75 |
1.83(75%) |
1.713 |
1.838 |
M2.5×0.45 |
2.1 |
2.13(75%) |
2.013 |
2.138 |
M3×0.5 |
2.5 |
2.59(75%) |
2.459 |
2.599 |
M3.5×0.6 |
2.9 |
3.01(75%) |
2.850 |
3.010 |
M4×0.7 |
3.3 |
3.39(80%) |
3.242 |
3.422 |
M4.5×0.75 |
3.8 |
3.85(80%) |
3.688 |
3.878 |
M5×0.8 |
4.2 |
4.31(80%) |
4.134 |
4.334 |
M6×1.0 |
5 |
5.13(80%) |
4.917 |
5.153 |
M7×1.0 |
6 |
6.13(80%) |
5.917 |
6.153 |
M8×1.25 |
6.8 |
6.85(85%) |
6.647 |
6.912 |
M9×1.25 |
7.8 |
7.85(85%) |
7.647 |
7.912 |
M10×1.5 |
8.5 |
8.62(85%) |
8.376 |
8.676 |
M11×1.5 |
9.5 |
9.62(85%) |
9.376 |
9.676 |
M12×1.75 |
10.3 |
10.40(85%) |
10.106 |
10.441 |
M14×2.0 |
12 |
12.2(85%) |
11.835 |
12.210 |
M16×2.0 |
14 |
14.2(85%) |
13.835 |
14.210 |
M18×2.5 |
15.5 |
15.7(85%) |
15.294 |
15.744 |
M20×2.5 |
17.5 |
17.7(85%) |
17.294 |
17.744 |
M22×2.5 |
19.5 |
19.7(85%) |
19.294 |
19.744 |
M24×3.0 |
21 |
21.2(85%) |
20.752 |
21.252 |
M27×3.0 |
24 |
24.2(85%) |
23.752 |
24.252 |
M30×3.5 |
26.5 |
26.6(90%) |
26.211 |
26.771 |
M33×3.5 |
29.5 |
29.6(90%) |
29.211 |
29.771 |
M36×4.0 |
32 |
32.1(90%) |
31.670 |
32.270 |
M39×4.0 |
35 |
35.1(90%) |
34.670 |
35.270 |
M42×4.5 |
37.5 |
37.6(90%) |
37.129 |
37.799 |
M45×4.5 |
40.5 |
40.6(90%) |
40.129 |
40.799 |
M48×5.0 |
43 |
43.1(90%) |
42.587 |
43.297 |
M52×5.0 |
47 |
47.1(90%) |
46.587 |
47.297 |
M56×5.5 |
50.5 |
50.6(90%) |
50.046 |
50.796 |
M60×5.5 |
54.5 |
54.6(90%) |
54.046 |
54.796 |
M64×6.0 |
58 |
58.1(90%) |
57.505 |
58.305 |
M68×6.0 |
62 |
62.1(90%) |
61.505 |
62.305 |
Nominalsize |
Drill dia |
JIS Class 2drillholedia |
JIS Class 2internal thread minor dia |
|
Min |
Max |
|||
M2.5×0.35 |
2.2 |
2.22(75%) |
2.121 |
2.221 |
M3×0.35 |
2.7 |
2.72(75%) |
2.621 |
2.721 |
M3.5×0.35 |
3.2 |
3.22(75%) |
3.121 |
3.221 |
M4×0.5 |
3.5 |
3.59(75%) |
3.459 |
3.599 |
M4.5×0.5 |
4 |
4.09(75%) |
3.959 |
4.099 |
M5×0.5 |
4.5 |
4.59(75%) |
4.459 |
4.599 |
M5.5×0.5 |
5 |
5.09(75%) |
4.959 |
5.099 |
M6×0.75 |
5.3 |
5.35(80%) |
5.188 |
5.378 |
M7×0.75 |
6.3 |
6.35(80%) |
6.188 |
6.378 |
M8×1.0 |
7 |
7.13(80%) |
6.917 |
7.153 |
M8×0.75 |
7.3 |
7.35(80%) |
7.188 |
7.378 |
M9×1.0 |
8 |
8.13(80%) |
7.917 |
8.153 |
M9×0.75 |
8.3 |
8.35(80%) |
8.188 |
8.378 |
M10×1.25 |
8.8 |
8.85(85%) |
8.647 |
8.912 |
M10×1.0 |
9 |
9.13(80%) |
8.917 |
9.153 |
M10×0.75 |
9.3 |
9.35(80%) |
9.188 |
9.378 |
M11×1.0 |
10 |
10.13(80%) |
9.917 |
10.153 |
M11×0.75 |
10.3 |
10.35(80%) |
10.188 |
10.378 |
M12×1.5 |
10.5 |
10.62(85%) |
10.376 |
10.676 |
M12×1.25 |
10.8 |
10.85(85%) |
10.647 |
10.912 |
M12×1.0 |
11 |
11.13(80%) |
10.917 |
11.153 |
M14×1.5 |
12.5 |
12.62(85%) |
12.376 |
12.676 |
M14×1.0 |
13 |
13.13(80%) |
12.917 |
13.153 |
M15×1.5 |
13.5 |
13.62(85%) |
13.376 |
13.676 |
M15×1.0 |
14 |
14.13(80%) |
13.917 |
14.153 |
M16×1.5 |
14.5 |
14.62(85%) |
14.376 |
14.676 |
M16×1.0 |
15 |
15.13(80%) |
14.917 |
15.153 |
M17×1.5 |
15.5 |
15.62(85%) |
15.376 |
15.676 |
M17×1.0 |
16 |
16.13(80%) |
15.917 |
16.153 |
M18×2.0 |
16 |
16.2(85%) |
15.835 |
16.210 |
M18×1.5 |
16.5 |
16.62(85%) |
16.376 |
16.676 |
M18×1.0 |
17 |
17.13(80%) |
16.917 |
17.153 |
M20×2.0 |
18 |
18.2(85%) |
17.835 |
18.210 |
M20×1.5 |
18.5 |
18.62(85%) |
18.376 |
18.676 |
M20×1.0 |
19 |
19.13(80%) |
18.917 |
19.153 |
Nominalsize |
Drill dia |
JIS Class 2drillholedia |
JIS Class 2internal thread minor dia |
|
Min |
Max |
|||
M22×2 |
20 |
20.2(85%) |
19.835 |
20.210 |
M22×1.5 |
20.5 |
20.62(85%) |
20.376 |
20.676 |
M22×1 |
21 |
21.13(80%) |
20.917 |
21.153 |
M24×2 |
22 |
22.2(85%) |
21.835 |
22.210 |
M24×1.5 |
22.5 |
22.62(85%) |
22.376 |
22.676 |
M24×1 |
23 |
23.13(80%) |
22.917 |
23.153 |
M25×2 |
23 |
23.2(85%) |
22.835 |
23.210 |
M25×1.5 |
23.5 |
23.62(85%) |
23.376 |
23.676 |
M25×1 |
24 |
24.13(80%) |
23.917 |
24.153 |
M26×1.5 |
24.5 |
24.62(85%) |
24.376 |
24.676 |
M27×2 |
25 |
25.2(85%) |
24.835 |
25.210 |
M27×1.5 |
25.5 |
25.62(85%) |
25.376 |
25.676 |
M27×1 |
26 |
26.13(80%) |
25.917 |
26.153 |
M28×2 |
26 |
26.2(85%) |
25.835 |
26.210 |
M28×1.5 |
26.5 |
26.62(85%) |
26.376 |
26.676 |
M28×1 |
27 |
27.13(80%) |
26.917 |
27.153 |
M30×3 |
27 |
27.2(85%) |
26.752 |
27.252 |
M30×2 |
28 |
28.2(85%) |
27.835 |
28.210 |
M30×1.5 |
28.5 |
28.62(85%) |
28.376 |
28.676 |
M30×1 |
29 |
29.13(80%) |
28.917 |
29.153 |
M32×2 |
30 |
30.2(85%) |
29.835 |
30.210 |
M32×1.5 |
30.5 |
30.62(85%) |
30.376 |
30.676 |
M33×3 |
30 |
30.2(85%) |
29.752 |
30.252 |
M33×2 |
31 |
31.2(85%) |
30.835 |
31.210 |
M33×1.5 |
31.5 |
31.62(85%) |
31.376 |
31.676 |
M35×1.5 |
33.5 |
33.62(85%) |
33.376 |
33.676 |
M36×3 |
33 |
33.2(85%) |
32.752 |
33.252 |
M36×2 |
34 |
34.2(85%) |
33.835 |
34.210 |
M36×1.5 |
34.5 |
34.62(85%) |
34.376 |
34.676 |
M38×1.5 |
36.5 |
36.62(85%) |
36.376 |
36.676 |
M39×3 |
36 |
36.2(85%) |
35.752 |
36.252 |
M39×2 |
37 |
37.2(85%) |
36.835 |
37.210 |
M39×1.5 |
37.5 |
37.62(85%) |
37.376 |
37.676 |
M40×3 |
37 |
37.2(85%) |
36.752 |
37.252 |
M40×2 |
38 |
38.2(85%) |
37.835 |
38.210 |
M40×1.5 |
38.5 |
38.62(85%) |
38.376 |
38.676 |
M42×4 |
38 |
38.1(85%) |
37.670 |
38.270 |
M42×3 |
39 |
39.2(85%) |
38.752 |
39.252 |
M42×2 |
40 |
40.2(85%) |
39.835 |
40.210 |
M42×1.5 |
40.5 |
40.62(85%) |
40.376 |
40.676 |
Nominalsize |
Drill dia |
JIS Class 2drillholedia |
JIS Class 2internal thread minor dia |
|
Min |
Max |
|||
M45×4 |
41 |
41.1(90%) |
40.670 |
41.270 |
M45×3 |
42 |
42.2(85%) |
41.752 |
42.252 |
M45×2 |
43 |
43.2(85%) |
42.835 |
43.210 |
M45×1.5 |
43.5 |
43.62(85%) |
43.376 |
43.676 |
M48×4 |
44 |
44.1(90%) |
43.670 |
44.270 |
M48×3 |
45 |
45.2(85%) |
44.752 |
45.252 |
M48×2 |
46 |
46.2(85%) |
45.835 |
46.210 |
M48×1.5 |
46.5 |
46.62(85%) |
46.376 |
46.676 |
M50×3 |
47 |
47.2(85%) |
46.752 |
47.252 |
M50×2 |
48 |
48.2(85%) |
47.835 |
48.210 |
M50×1.5 |
48.5 |
48.62(85%) |
48.376 |
48.676 |
M52×4 |
48 |
48.1(90%) |
47.670 |
48.270 |
M52×3 |
49 |
49.2(85%) |
48.752 |
49.252 |
M52×2 |
50 |
50.2(85%) |
49.835 |
50.210 |
M52×1.5 |
50.5 |
50.62(85%) |
50.376 |
50.676 |
M55×4 |
51 |
51.1(90%) |
50.670 |
51.270 |
M55×3 |
52 |
52.2(85%) |
51.752 |
52.252 |
M55×2 |
53 |
53.2(85%) |
52.835 |
53.210 |
M55×1.5 |
53.5 |
53.62(85%) |
53.376 |
53.676 |
M56×4 |
52 |
52.1(90%) |
51.670 |
52.270 |
M56×3 |
53 |
53.2(85%) |
52.752 |
53.252 |
M56×2 |
54 |
54.2(85%) |
53.835 |
54.210 |
M56×1.5 |
54.5 |
54.62(85%) |
54.376 |
54.676 |
M58×4 |
54 |
54.1(90%) |
53.670 |
54.270 |
M58×3 |
55 |
55.2(85%) |
54.752 |
55.252 |
M58×2 |
56 |
56.2(85%) |
55.835 |
56.210 |
M58×1.5 |
56.5 |
56.62(85%) |
56.376 |
56.676 |
M60×4 |
56 |
56.1(90%) |
55.670 |
56.270 |
M60×3 |
57 |
57.2(85%) |
56.752 |
57.252 |
M60×2 |
58 |
58.2(85%) |
57.835 |
58.210 |
M60×1.5 |
58.5 |
58.62(85%) |
58.376 |
58.676 |
M62×4 |
58 |
58.1(90%) |
57.670 |
58.270 |
M62×3 |
59 |
59.2(85%) |
58.752 |
59.252 |
M62×2 |
60 |
60.2(85%) |
59.835 |
60.210 |
M62×1.5 |
60.5 |
60.62(85%) |
60.376 |
60.676 |
M64×4 |
60 |
60.1(90%) |
59.670 |
60.270 |
M64×3 |
61 |
61.2(85%) |
60.752 |
61.252 |
M64×2 |
62 |
62.2(85%) |
61.835 |
62.210 |
M64×1.5 |
62.5 |
62.62(85%) |
62.376 |
62.676 |
Nominalsize |
Drill dia |
JIS class 2 internal thread minor dia |
BSW internal thread minor dia |
|||
Line A (Hard materials) |
Line B (Soft materials) |
Min |
Max |
Min |
Max |
|
※W1/8-40 |
2.55 |
2.45 |
- |
- |
2.362 |
2.591 |
※W3/16-24 |
3.7 |
3.6 |
- |
- |
3.406 |
3.774 |
※W1/4-20 |
5.1 |
5.0 |
4.914 |
5.204 |
4.724 |
5.156 |
W5/16-18 |
6.6 |
6.5 |
6.340 |
6.670 |
6.129 |
6.588 |
W3/8-16 |
8.0 |
7.9 |
7.733 |
8.113 |
7.493 |
7.988 |
W7/16-14 |
9.4 |
9.3 |
9.048 |
9.508 |
8.791 |
9.332 |
W1/2-12 |
10.7 |
10.5 |
10.310 |
10.830 |
9.990 |
10.589 |
W9/16-12 |
12.3 |
12.0 |
11.898 |
12.418 |
11.575 |
12.176 |
W5/8-11 |
13.7 |
13.5 |
13.257 |
13.817 |
12.918 |
13.558 |
W3/4-10 |
16.6 |
16.5 |
16.178 |
16.778 |
15.800 |
16.484 |
W7/8-9 |
19.5 |
19.3 |
19.031 |
19.691 |
18.613 |
19.354 |
W1-8 |
22.4 |
22.0 |
21.814 |
22.514 |
21.336 |
22.148 |
W1 1/8-7 |
25.0 |
24.8 |
24.469 |
25.229 |
23.927 |
24.831 |
W1 1/4-7 |
28.3 |
28.0 |
27.644 |
28.404 |
27.102 |
28.006 |
W1 3/8-6 |
30.5 |
30.3 |
30.123 |
30.923 |
- |
- |
W1 1/2-6 |
33.8 |
33.5 |
33.298 |
34.098 |
32.680 |
33.703 |
W1 5/8-5 |
36.0 |
35.7 |
35.529 |
36.409 |
- |
- |
W1 3/4-5 |
39.2 |
39.0 |
38.704 |
39.584 |
37.943 |
39.136 |
W1 7/8-4 1/2 |
41.8 |
41.5 |
41.237 |
42.227 |
- |
- |
W2-4 1/2 |
45.0 |
44.7 |
44.412 |
45.402 |
43.571 |
44.876 |
Nominalsize |
Drill dia |
JIS class 2drill holedia. |
JIS class 2 internal thread minor dia |
Nominalsize |
Drill dia |
JIS class 2drill holedia. |
JIS class 2 internal thread minor dia |
||
Min |
Max |
Min |
Max |
||||||
SM 1/16-80 |
1.25 |
1.28(75%) |
1.211 |
1.281 |
SM 1/4-24 |
5.20 |
5.25(80%) |
5.086 |
5.266 |
SM 5/64-64 |
1.55 |
1.58(80%) |
1.513 |
1.593 |
SM 9/32-28 |
6.10 |
6.20(80%) |
6.066 |
6.256 |
SM 3/32-100 |
2.10 |
2.15(70%) |
2.081 |
2.156 |
SM 9/32-20 |
5.70 |
5.82(80%) |
5.631 |
5.824 |
SM 3/32-56 |
1.85 |
1.91(80%) |
1.841 |
1.936 |
SM 5/16-28 |
6.90 |
6.00(80%) |
6.860 |
7.050 |
SM 1/8-44 |
2.50 |
2.58(80%) |
2.485 |
2.605 |
SM 5/16-24 |
6.70 |
6.84(80%) |
6.674 |
6.864 |
SM 1/8-40 |
2.45 |
2.52(80%) |
2.421 |
2.551 |
SM 5/16-18 |
6.30 |
6.38(85%) |
6.254 |
6.444 |
SM 9/64-40 |
2.85 |
2.91(80%) |
2.818 |
2.948 |
SM 3/8-28 |
8.50 |
8.58(80%) |
8.447 |
8.637 |
SM 11/64-40 |
3.65 |
3.71(80%) |
3.612 |
3.742 |
SM 3/8-18 |
7.90 |
7.97(85%) |
7.843 |
8.053 |
SM 3/16-32 |
3.90 |
3.94(80%) |
3.820 |
3.980 |
SM 7/16-28 |
10.10 |
10.17(80%) |
10.034 |
10.224 |
SM 3/16-28 |
3.70 |
3.82(80%) |
3.684 |
3.844 |
SM 7/16-16 |
9.30 |
9.36(85%) |
9.220 |
9.440 |
SM 7/32-32 |
4.70 |
4.73(80%) |
4.614 |
4.774 |
SM 1/2-28 |
11.70 |
11.76(80%) |
11.622 |
11.812 |
SM 15/64-28 |
4.90 |
5.01(80%) |
4.875 |
5.055 |
SM 1/2-20 |
11.30 |
11.38(80%) |
11.190 |
11.410 |
SM 1/4-40 |
5.60 |
5.69(80%) |
5.596 |
5.726 |
SM 1/2-12 |
10.30 |
10.36(85%) |
10.180 |
10.420 |
SM 1/4-28 |
5.30 |
5.41(80%) |
5.272 |
5.452 |
SM 9/16-20 |
12.90 |
12.90(85%) |
12.778 |
13.018 |
Nominalsize |
Drill dia |
JIS Class 2B drill hole dia |
JIS Class 2B internal thread minor dia |
|
Min |
Max |
|||
No.1-64 UNC |
1.55 |
1.57(65%) |
1.425 |
1.582 |
No.2-56 UNC |
1.8 |
1.86(65%) |
1.695 |
1.871 |
No.3-48 UNC |
2.1 |
2.14(65%) |
1.941 |
2.146 |
No.4-40 UNC |
2.3 |
2.36(70%) |
2.157 |
2.385 |
No.5-40 UNC |
2.6 |
2.69(70%) |
2.487 |
2.697 |
No.6-32 UNC |
2.8 |
2.86(75%) |
2.642 |
2.895 |
No.8-32 UNC |
3.4 |
3.52(75%) |
3.302 |
3.530 |
No.10-24UNC |
3.9 |
3.91(80%) |
3.683 |
3.962 |
No.12-24UNC |
4.5 |
4.57(80%) |
4.344 |
4.597 |
1/4-20 UNC |
5.1 |
5.25(80%) |
4.979 |
5.257 |
5/16-18 UNC |
6.6 |
6.72(80%) |
6.401 |
6.731 |
3/8-16 UNC |
8.0 |
8.15(80%) |
7.798 |
8.153 |
7/16-14 UNC |
9.4 |
9.5(80%) |
9.144 |
9.550 |
1/2-13 UNC |
10.8 |
11.0(80%) |
10.592 |
11.023 |
9/16-12 UNC |
12.2 |
12.3(85%) |
11.989 |
12.446 |
5/8-11 UNC |
13.6 |
13.8(85%) |
13.386 |
13.868 |
3/4-10 UNC |
16.5 |
16.8(85%) |
16.307 |
16.840 |
7/8-9 UNC |
19.5 |
19.6(85%) |
19.177 |
19.761 |
1-8 UNC |
22.2 |
22.5(85%) |
21.971 |
22.606 |
1 1/8-7 UNC |
25.0 |
25.2(85%) |
24.638 |
25.349 |
1 1/4-7 UNC |
28.2 |
28.4(85%) |
27.813 |
28.524 |
1 3/8-6 UNC |
30.8 |
31.0(85%) |
30.353 |
31.115 |
1 1/2-6 UNC |
34.0 |
34.2(85%) |
33.528 |
34.290 |
1 3/4-5UNC |
39.5 |
39.8(85%) |
38.964 |
39.827 |
2-4 1/2UNC |
45.2 |
45.3(90%) |
44.679 |
45.593 |
Nominalsize |
Drill dia |
JIS Class 2B drill hole dia |
JIS Class 2B internal thread minor dia |
|
Min |
Max |
|||
No.0-80UNF |
1.25 |
1.30(65%) |
1.182 |
1.305 |
No.1-72UNF |
1.55 |
1.61(65%) |
1.474 |
1.612 |
No.2-64UNF |
1.85 |
1.90(65%) |
1.756 |
1.912 |
No.3-56UNF |
2.1 |
2.17(70%) |
2.025 |
2.197 |
No.4-48UNF |
2.4 |
2.44(70%) |
2.271 |
2.458 |
No.5-44UNF |
2.7 |
2.74(70%) |
2.551 |
2.740 |
No.6-40UNF |
2.9 |
3.02(70%) |
2.820 |
3.022 |
No.8-36UNF |
3.5 |
3.59(75%) |
3.404 |
3.606 |
No.10-32UNF |
4.1 |
4.14(80%) |
3.963 |
4.165 |
No.12-28UNF |
4.6 |
4.70(80%) |
4.496 |
4.724 |
1/4-28UNF |
5.5 |
5.56(80%) |
5.360 |
5.588 |
5/16-24UNF |
6.9 |
7.02(80%) |
6.782 |
7.035 |
3/8-24UNF |
8.5 |
8.61(80%) |
8.382 |
8.636 |
7/16-20UNF |
9.9 |
10.01(80%) |
9.729 |
10.033 |
1/2-20UNF |
11.5 |
11.60(80%) |
11.329 |
11.607 |
9/16-18UNF |
12.9 |
13.07(80%) |
12.751 |
13.081 |
5/8-18UNF |
14.5 |
14.65(80%) |
14.351 |
14.681 |
3/4-16UNF |
17.5 |
17.59(85%) |
17.323 |
17.678 |
7/8-14UNF |
20.5 |
20.6(85%) |
20.270 |
20.675 |
1-12UNF |
23.2 |
23.5(85%) |
23.114 |
23.571 |
1 1/8-12UNF |
26.5 |
26.7(80%) |
26.289 |
26.746 |
1 1/4-12UNF |
29.5 |
29.9(80%) |
29.464 |
29.921 |
1 3/8-12 UNF |
32.8 |
33.0(85%) |
32.639 |
33.096 |
1 1/2-12UNF |
36.0 |
36.2(85%) |
35.814 |
36.271 |
Nominal size |
Drill dia |
ANSI Class 2B drill hole dia |
ANSI Class 2B internal thread minor dia |
Nominal size |
Drill dia |
ANSI Class 2B drill hole dia |
ANSI Class 2B internal thread minor dia |
||
Min |
Max |
Min |
Max |
||||||
No.12-32UNEF |
4.7 |
4.7(90%) |
4.623 |
4.826 |
1 1/4-18 UNEF |
30.3 |
30.4(90%) |
30.226 |
30.556 |
1/4-32UNEF |
5.6 |
5.6(85%) |
5.486 |
5.690 |
1 1/4-8 UN |
28.5 |
28.7(90%) |
28.321 |
28.956 |
5/16-32UNEF |
7.1 |
7.2(85%) |
7.087 |
7.264 |
1 3/8-18 UNEF |
33.5 |
33.6(85%) |
33.401 |
33.731 |
3/8-32UNEF |
8.7 |
8.8(85%) |
8.651 |
8.865 |
1 3/8-8 UN |
31.8 |
31.8(90%) |
31.496 |
32.131 |
7/16-28UNEF |
10.2 |
10.25(85%) |
10.135 |
10.338 |
1 1/2-18 UNEF |
36.6 |
36.7(90%) |
36.576 |
36.881 |
1/2-28UNEF |
11.8 |
11.8(90%) |
11.709 |
11.938 |
1 1/2-8 UN |
35.0 |
35.0(90%) |
34.671 |
35.306 |
9/16-24UNEF |
13.2 |
13.3(85%) |
13.132 |
13.386 |
1 5/8-18 UNEF |
39.8 |
39.9(90%) |
39.751 |
40.081 |
5/8-24UNEF |
14.8 |
14.9(85%) |
14.732 |
14.986 |
1 5/8-8 UN |
38.2 |
38.2(90%) |
37.846 |
38.481 |
3/4-20UNEF |
17.8 |
17.8(90%) |
17.678 |
17.958 |
1 5/8-12 UN |
39.2 |
39.2(90%) |
38.989 |
39.446 |
7/8-20UNEF |
21.0 |
21.0(90%) |
20.853 |
21.133 |
1 3/4-8 UN |
41.3 |
41.3(90%) |
41.021 |
41.656 |
1-20UNEF |
24.1 |
24.2(85%) |
24.028 |
24.308 |
1 3/4-12 UN |
42.3 |
41.4(90%) |
42.164 |
42.621 |
1 1/8-18UNEF |
27.2 |
27.2(90%) |
27.051 |
27.381 |
2-8 UN |
47.8 |
47.8(85%) |
47.371 |
48.006 |
1 1/8-8UN |
25.5 |
25.5(90%) |
25.146 |
25.781 |
2-12 UN |
48.6 |
48.7(90%) |
48.514 |
48.971 |
Nominalsize |
Taper Thread |
Parallel thread |
||||
NPT |
NPS (NPSC) |
|||||
Use with reamer |
Without reamer |
Drill dia |
||||
mm |
inch |
mm |
inch |
mm |
inch |
|
1/16-27 |
5.94 |
0.234 |
6.15 |
0.242 |
6.35 |
0.250 |
1/8-27 |
8.33 |
0.328 |
8.43 |
0.332 |
8.74 |
0.344 |
1/4-18 |
10.72 |
0.422 |
11.13 |
0.438 |
11.13 |
0.438 |
3/8-18 |
14.27 |
0.562 |
14.27 |
0.562 |
14.68 |
0.578 |
1/2-14 |
17.48 |
0.688 |
17.86 |
0.703 |
18.26 |
0.719 |
3/4-14 |
22.63 |
0.891 |
23.01 |
0.906 |
23.42 |
0.922 |
1-11 1/2 |
28.58 |
1.125 |
28.98 |
1.141 |
29.36 |
1.156 |
1 1/4-11 1/2 |
37.31 |
1.469 |
37.69 |
1.484 |
38.10 |
1.500 |
1 1/2-11 1/2 |
43.26 |
1.703 |
43.66 |
1.719 |
44.45 |
1.750 |
2-11 1/2 |
55.17 |
2.172 |
55.58 |
2.188 |
56.36 |
2.219 |
2 1/2-8 |
65.48 |
2.578 |
66.27 |
2.609 |
67.46 |
2.656 |
Nominalsize |
Taper Thread |
Parallel thread |
||||
NPTF |
NPSF |
|||||
Use with reamer |
Without reamer |
Drill dia |
||||
mm |
inch |
mm |
inch |
mm |
inch |
|
1/16-27 |
5.94 |
0.234 |
6.15 |
0.242 |
6.25 |
0.246 |
1/8-27 |
8.33 |
0.328 |
8.43 |
0.332 |
8.61 |
0.339 |
1/4-18 |
10.72 |
0.422 |
11.13 |
0.438 |
11.13 |
0.438 |
3/8-18 |
14.27 |
0.562 |
14.27 |
0.562 |
14.68 |
0.578 |
1/2-14 |
17.48 |
0.688 |
17.86 |
0.703 |
17.86 |
0.703 |
3/4-14 |
22.63 |
0.891 |
23.01 |
0.906 |
23.42 |
0.922 |
1-11 1/2 |
28.58 |
1.125 |
28.98 |
1.141 |
29.36 |
1.156 |
1 1/4-11 1/2 |
37.31 |
1.469 |
37.69 |
1.484 |
─ |
─ |
1 1/2-11 1/2 |
43.26 |
1.703 |
43.66 |
1.719 |
─ |
─ |
2-11 1/2 |
55.17 |
2.172 |
55.58 |
2.188 |
─ |
─ |
2 1/2-8 |
65.48 |
2.578 |
66.27 |
2.609 |
─ |
─ |
Nominalsize |
Drill dia |
Minor diameter |
Nominalsize |
Drill dia |
Minor diameter |
||
Min |
Max |
Min |
Max |
||||
1/8-27 |
9.2 |
9.093 |
9.246 |
1-11 1/2 |
30.6 |
30.505 |
30.759 |
1/4-18 |
12.0 |
11.887 |
12.217 |
1 1/4-11 1/2 |
39.3 |
39.268 |
39.497 |
3/8-18 |
15.4 |
15.316 |
15.545 |
1 1/2-11 1/2 |
45.4 |
45.339 |
45.568 |
1/2-14 |
19.0 |
18.974 |
19.279 |
2-11 1/2 |
57.5 |
57.379 |
57.607 |
3/4-14 |
24.5 |
24.333 |
24.638 |
2 1/2-8 |
69.0 |
68.783 |
69.266 |
Nominalsize |
Drill dia |
Internal thread minor dia on (min) length of useful thread |
Internal thread minordiaon(min) gaugelength |
|
Use with reamer |
Without reamer |
|||
RC1/16-28 |
6.1 |
6.2 |
6.244 |
6.370 |
RC1/8-28 |
8.1 |
8.2 |
8.249 |
8.375 |
RC1/4-19 |
10.7 |
11.0 |
10.962 |
11.153 |
RC3/8-19 |
14.2 |
14.5 |
14.448 |
14.636 |
RC1/2-14 |
17.6 |
18.0 |
17.979 |
18.234 |
RC3/4-14 |
23.0 |
23.4 |
23.378 |
23.635 |
RC1-11 |
29.0 |
29.5 |
29.459 |
29.786 |
RC1 1/4-11 |
37.5 |
38.0 |
37.976 |
38.302 |
RC1 1/2-11 |
43.4 |
44.0 |
43.869 |
44.195 |
RC2-11 |
54.9 |
55.5 |
55.412 |
55.808 |
RC2 1/2-11 |
70.4 |
71.0 |
70.737 |
71.279 |
RC3-11 |
82.8 |
83.4 |
83.244 |
83.780 |
RC4-11 |
107.5 |
108.2 |
108.015 |
108.629 |
Nominalsize |
Drill dia |
Minor diameter of JIS internal thread (D1) |
|
Min |
Max |
||
Rp 1/16-28 |
6.5 |
6.490 |
6.632 |
Rp 1/8-28 |
8.5 |
8.495 |
8.637 |
Rp 1/4-19 |
11.4 |
11.341 |
11.549 |
Rp 3/8-19 |
14.9 |
14.846 |
15.054 |
Rp 1/2-14 |
18.6 |
18.489 |
18.773 |
Rp 3/4-14 |
24.0 |
23.975 |
24.259 |
Rp 1-11 |
30.2 |
30.110 |
30.472 |
Rp 1 1/4-11 |
38.8 |
38.771 |
39.133 |
Rp 1 1/2-11 |
44.7 |
44.664 |
45.026 |
Rp 2-11 |
56.5 |
56.475 |
56.837 |
Rp 2 1/2-11 |
72.2 |
72.010 |
72.442 |
Rp 3-11 |
84.9 |
84.710 |
85.142 |
Rp 4/11 |
110.0 |
109.856 |
110.288 |
Nominalsize |
Drill dia |
Minor diameterof JIS internal thread (D1) |
|
Min |
Max |
||
G1/16-28 |
6.7 |
6.561 |
6.843 |
G1/8-28 |
8.7 |
8.566 |
8.848 |
G1/4-19 |
11.7 |
11.445 |
11.890 |
G3/8-19 |
15.2 |
14.950 |
15.395 |
G1/2-14 |
19.0 |
18.631 |
19.172 |
G5/8-14 |
21.0 |
20.587 |
21.128 |
G3/4-14 |
24.5 |
24.117 |
24.658 |
G7/8-14 |
28.2 |
27.877 |
28.418 |
G1-11 |
30.6 |
30.291 |
30.931 |
G1 1/8-11 |
35.2 |
34.939 |
35.579 |
G1 1/4-11 |
39.2 |
38.952 |
39.592 |
G1 1/2-11 |
45.0 |
44.845 |
45.485 |
G1 3/4-11 |
51.0 |
50.788 |
51.428 |
G2-11 |
57.0 |
56.656 |
57.296 |