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| AMERICAN NATIONAL STANDARD PITCH DIAMETER CHART
THREAD PLUG GAGES |
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| 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 |
0.0536 |
0.0532 |
9/16-24 NEF |
0.5354 |
0.5394 |
0.5382 |
| #1-64 NF |
0.0629 |
0.0648 |
0.0643 |
5/8-11 NC |
0.5660 |
0.5719 |
0.5702 |
| #1-72 NF |
0.0640 |
0.0658 |
0.0653 |
5/8-18 NF |
0.5889 |
0.5930 |
0.5919 |
| #2-56 NC |
0.0744 |
0.0764 |
0.0759 |
5/8-24 NEF |
0.5979 |
0.6020 |
0.6008 |
| #2-64 NF |
0.0759 |
0.0778 |
0.0773 |
11/16-24 NEF |
0.6604 |
0.6645 |
0.6633 |
| #3-48 NC |
0.0855 |
0.0877 |
0.0871 |
3/4-10 NC |
0.6850 |
0.6914 |
0.6895 |
| #3-56 NF |
0.0874 |
0.0894 |
0.0889 |
3/4-16 NF |
0.7094 |
0.7139 |
0.7126 |
| #4-40 NC |
0.0958 |
0.0982 |
0.0975 |
3/4-20 NEF |
0.7175 |
0.7221 |
0.7207 |
| #4-48 NF |
0.0985 |
0.1007 |
0.1001 |
13/16-20 NEF |
0.7800 |
0.7846 |
0.7832 |
| #5-40 NC |
0.1088 |
0.1112 |
0.1105 |
7/8-9 NC |
0.8028 |
0.8098 |
0.8077 |
| #5-44 NF |
0.1102 |
0.1125 |
0.1118 |
7/8-14 NF |
0.8286 |
0.8335 |
0.8322 |
| #6-32 NC |
0.1177 |
0.1204 |
0.1196 |
7/8-20 NEF |
0.8425 |
0.8472 |
0.8458 |
| #6-40 NF |
0.1218 |
0.1242 |
0.1235 |
15/16-20 NEF |
0.9050 |
0.9097 |
0.9083 |
| #8-32 NC |
0.1437 |
0.1464 |
0.1456 |
1"-8 NC |
0.9188 |
0.9264 |
0.9242 |
| #8-36 NF |
0.1460 |
0.1485 |
0.1478 |
1"-12 NF |
0.9459 |
0.9515 |
0.9499 |
| #10-24 NC |
0.1629 |
0.1662 |
0.1653 |
1"-14 NS |
0.9536 |
0.9585 |
0.9572 |
| #10-32 NF |
0.1697 |
0.1724 |
0.1716 |
1"-20 NEF |
0.9675 |
0.9723 |
0.9709 |
| #12-24 NC |
0.1889 |
0.1922 |
0.1913 |
1 1/16-12 N |
1.0084 |
1.0140 |
1.0124 |
| #12-28 NF |
0.1928 |
0.1959 |
0.1950 |
1 1/16-18 NEF |
1.0264 |
1.0315 |
1.0300 |
| #12-32 NEF |
0.1957 |
0.1988 |
0.1979 |
1 1/8-7 NC |
1.0322 |
1.0407 |
1.0381 |
| 1/4-20 NC |
0.2175 |
0.2211 |
0.2201 |
1 1/8-12 NF |
1.0709 |
1.0765 |
1.0749 |
| 1/4-28 NF |
0.2268 |
0.2299 |
0.2290 |
1 1/8-18 NEF |
1.0889 |
1.0941 |
1.0925 |
| 1/4-32 NEF |
0.2297 |
0.2329 |
0.2319 |
1 3/16-12 N |
1.1334 |
1.1390 |
1.1374 |
| 5/16-18 NC |
0.2764 |
0.2805 |
0.2794 |
1 3/16-18 NEF |
1.1514 |
1.1566 |
1.1550 |
| 5/16-24 NF |
0.2854 |
0.2887 |
0.2878 |
1 1/4-7 NC |
1.1572 |
1.1657 |
1.1631 |
| 5/16-32 NEF |
0.2922 |
0.2955 |
0.2945 |
1 1/4-12 NF |
1.1959 |
1.2015 |
1.1999 |
| 3/8-16 NC |
0.3344 |
0.3389 |
0.3376 |
1 1/4-18 NEF |
1.2139 |
1.2192 |
1.2176 |
| 3/8-24 NF |
0.3479 |
0.3512 |
0.3503 |
1 5/16-12 N |
1.2584 |
1.2640 |
1.2624 |
| 3/8-32 NEF |
0.3547 |
0.3581 |
0.3571 |
1 5/16-18 NEF |
1.2764 |
1.2817 |
1.2801 |
| 7/16-14 NC |
0.3911 |
0.3960 |
0.3947 |
1 3/8-6 NC |
1.2667 |
1.2768 |
1.2738 |
| 7/16-20 NF |
0.4050 |
0.4086 |
0.4076 |
1 3/8-12 NF |
1.3209 |
1.3265 |
1.3249 |
| 7/16-28 NEF |
0.4143 |
0.4179 |
0.4168 |
1 3/8-18 NEF |
1.3389 |
1.3443 |
1.3427 |
| 1/2-12 N |
0.4459 |
0.4515 |
0.4499 |
1 7/16-12 N |
1.3834 |
1.3890 |
1.3874 |
| 1/2-13 NC |
0.4500 |
0.4552 |
0.4537 |
1 7/16-18 NEF |
1.4014 |
1.4068 |
1.4052 |
| 1/2-20 NF |
0.4675 |
0.4711 |
0.4701 |
1 1/2-6 NC |
1.3917 |
1.4018 |
1.3988 |
| 1/2-28 NEF |
0.4768 |
0.4805 |
0.4794 |
1 1/2-12 NF |
1.4459 |
1.4515 |
1.4499 |
| 9/16-12 NC |
0.5084 |
0.5140 |
0.5124 |
1 1/2-18 NEF |
1.4639 |
1.4694 |
1.4677 |
| 9/16-18 NF |
0.5264 |
0.5305 |
0.5294 |
Reference National Bureau of Standards
Handbook H-28 |
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