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| AMERICAN NATIONAL STANDARD PITCH DIAMETER CHART THREAD RING GAGES AND SETTING PLUGS |
| NOMINAL SIZE |
AMERICAN NATIONAL |
NOMINAL SIZE |
AMERICAN NATIONAL |
| GO |
NO GO |
GO |
NO GO |
| CL. 2&3 |
CL. 2 |
CL. 3 |
CL. 2&3 |
CL. 2 |
CL. 3 |
| #0-80 NF |
0.0519 |
0.0502 |
0.0506 |
9/16-24 NEF |
0.5354 |
0.5314 |
0.5326 |
| #1-64 NF |
0.0629 |
0.0610 |
0.0615 |
5/8-11 NC |
0.5660 |
0.5601 |
0.5618 |
| #1-72 NF |
0.0640 |
0.0622 |
0.0627 |
5/8-18 NF |
0.5889 |
0.5848 |
0.5859 |
| #2-56 NC |
0.0744 |
0.0724 |
0.0729 |
5/8-24 NEF |
0.5979 |
0.5938 |
0.5950 |
| #2-64 NF |
0.0759 |
0.0740 |
0.0745 |
11/16-24 NEF |
0.6604 |
0.6563 |
0.6575 |
| #3-48 NC |
0.0855 |
0.0833 |
0.0839 |
3/4-10 NC |
0.6850 |
0.6786 |
0.6805 |
| #3-56 NF |
0.0874 |
0.0854 |
0.0859 |
3/4-16 NF |
0.7094 |
0.7049 |
0.7062 |
| #4-40 NC |
0.0958 |
0.0934 |
0.0941 |
3/4-20 NEF |
0.7175 |
0.7129 |
0.7143 |
| #4-48 NF |
0.0985 |
0.0963 |
0.0969 |
13/16-20 NEF |
0.7800 |
0.7754 |
0.7768 |
| #5-40 NC |
0.1088 |
0.1064 |
0.1071 |
7/8-9 NC |
0.8028 |
0.7958 |
0.7979 |
| #5-44 NF |
0.1102 |
0.1079 |
0.1086 |
7/8-14 NF |
0.8286 |
0.8237 |
0.8250 |
| #6-32 NC |
0.1177 |
0.1150 |
0.1158 |
7/8-20 NEF |
0.8425 |
0.8378 |
0.8392 |
| #6-40 NF |
0.1218 |
0.1194 |
0.1201 |
15/16-20 NEF |
0.9050 |
0.9003 |
0.9017 |
| #8-32 NC |
0.1437 |
0.1410 |
0.1418 |
1"-8 NC |
0.9188 |
0.9112 |
0.9134 |
| #8-36 NF |
0.1460 |
0.1435 |
0.1442 |
1"-12 NF |
0.9459 |
0.9403 |
0.9419 |
| #10-24 NC |
0.1629 |
0.1596 |
0.1605 |
1"-14 NS |
0.9536 |
0.9487 |
0.9500 |
| #10-32 NF |
0.1697 |
0.1670 |
0.1678 |
1"-20 NEF |
0.9675 |
0.9627 |
0.9641 |
| #12-24 NC |
0.1889 |
0.1856 |
0.1865 |
1 1/16-12 N |
1.0084 |
1.0028 |
1.0044 |
| #12-28 NF |
0.1928 |
0.1897 |
0.1906 |
1 1/16-18 NEF |
1.0264 |
1.0213 |
1.0228 |
| #12-32 NEF |
0.1957 |
0.1926 |
0.1935 |
1 1/8-7 NC |
1.0322 |
1.0237 |
1.0263 |
| 1/4-20 NC |
0.2175 |
0.2139 |
0.2149 |
1 1/8-12 NF |
1.0709 |
1.0653 |
1.0669 |
| 1/4-28 NF |
0.2268 |
0.2237 |
0.2246 |
1 1/8-18 NEF |
1.0889 |
1.0837 |
1.0853 |
| 1/4-32 NEF |
0.2297 |
0.2265 |
0.2275 |
1 3/16-12 N |
1.1334 |
1.1278 |
1.1294 |
| 5/16-18 NC |
0.2764 |
0.2723 |
0.2734 |
1 3/16-18 NEF |
1.1514 |
1.1462 |
1.1478 |
| 5/16-24 NF |
0.2854 |
0.2821 |
0.2830 |
1 1/4-7 NC |
1.1572 |
1.1487 |
1.1513 |
| 5/16-32 NEF |
0.2922 |
0.2889 |
0.2899 |
1 1/4-12 NF |
1.1959 |
1.1903 |
1.1919 |
| 3/8-16 NC |
0.3344 |
0.3299 |
0.3312 |
1 1/4-18 NEF |
1.2139 |
1.2086 |
1.2102 |
| 3/8-24 NF |
0.3479 |
0.3446 |
0.3455 |
1 5/16-12 N |
1.2584 |
1.2528 |
1.2544 |
| 3/8-32 NEF |
0.3547 |
0.3513 |
0.3523 |
1 5/16-18 NEF |
1.2764 |
1.2711 |
1.2727 |
| 7/16-14 NC |
0.3911 |
0.3862 |
0.3875 |
1 3/8-6 NC |
1.2667 |
1.2566 |
1.2596 |
| 7/16-20 NF |
0.4050 |
0.4014 |
0.4024 |
1 3/8-12 NF |
1.3209 |
1.3153 |
1.3169 |
| 7/16-28 NEF |
0.4143 |
0.4107 |
0.4118 |
1 3/8-18 NEF |
1.3389 |
1.3335 |
1.3351 |
| 1/2-12 N |
0.4459 |
0.4403 |
0.4419 |
1 7/16-12 N |
1.3834 |
1.3778 |
1.3794 |
| 1/2-13 NC |
0.4500 |
0.4448 |
0.4463 |
1 7/16-18 NEF |
1.4014 |
1.3960 |
1.3976 |
| 1/2-20 NF |
0.4675 |
0.4639 |
0.4649 |
1 1/2-6 NC |
1.3917 |
1.3816 |
1.3846 |
| 1/2-28 NEF |
0.4768 |
0.4731 |
0.4742 |
1 1/2-12 NF |
1.4459 |
1.4403 |
1.4419 |
| 9/16-12 NC |
0.5084 |
0.5028 |
0.5044 |
1 1/2-18 NEF |
1.4639 |
1.4584 |
1.4601 |
| 9/16-18 NF |
0.5264 |
0.5223 |
0.5234 |
Reference National Bureau of Standards
Handbook H-28 |
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