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| Size |
Major Dia |
Threads Per Inch |
Pitch Dia |
Minor Dia Externala |
Minor Dia Internalb |
Minor Dia Area |
Tensile Stress Area |
| # |
inch |
tpi |
inch |
inch |
inch |
sq. inch |
sq. inch |
| #1* |
0.073 |
64 |
0.0629 |
0.0544 |
0.0561 |
0.00218 |
0.00263 |
| #2 |
0.086 |
56 |
0.0744 |
0.0648 |
0.0667 |
0.0031 |
0.0037 |
| #3* |
0.099 |
48 |
0.0855 |
0.0741 |
0.0764 |
0.00406 |
0.00487 |
| #4 |
0.112 |
40 |
0.0958 |
0.0822 |
0.0849 |
0.00496 |
0.00604 |
| #5 |
0.125 |
40 |
0.1088 |
0.0952 |
0.0979 |
0.00672 |
0.00796 |
| #6 |
0.138 |
32 |
0.1177 |
0.1008 |
0.1042 |
0.00745 |
0.00909 |
| #8 |
0.164 |
32 |
0.1437 |
0.1268 |
0.1302 |
0.01196 |
0.014 |
| #10 |
0.19 |
24 |
0.1629 |
0.1404 |
0.1449 |
0.0145 |
0.0175 |
| #12* |
0.216 |
24 |
0.1889 |
0.1664 |
0.1709 |
0.0206 |
0.0242 |
| ¼ |
0.25 |
20 |
0.2175 |
0.1905 |
0.1959 |
0.0269 |
0.0318 |
| 5/16 |
0.3125 |
18 |
0.2764 |
0.2464 |
0.2524 |
0.0454 |
0.0524 |
| 3/8 |
0.375 |
16 |
0.3344 |
0.3005 |
0.3073 |
0.0678 |
0.0775 |
| 7/16 |
0.4375 |
14 |
0.3911 |
0.3525 |
0.3602 |
0.0933 |
0.1063 |
| ½ |
0.5 |
13 |
0.45 |
0.4084 |
0.4167 |
0.1257 |
0.1419 |
| 9/16 |
0.5625 |
12 |
0.5084 |
0.4633 |
0.4723 |
0.162 |
0.182 |
| 5/8 |
0.625 |
11 |
0.566 |
0.5168 |
0.5266 |
0.202 |
0.226 |
| ¾ |
0.75 |
10 |
0.685 |
0.6309 |
0.6417 |
0.302 |
0.334 |
| 7/8 |
0.875 |
9 |
0.8028 |
0.7427 |
0.7547 |
0.419 |
0.462 |
| 1 |
1 |
8 |
0.9188 |
0.8512 |
0.8647 |
0.551 |
0.606 |
| 1-1/8 |
1.125 |
7 |
1.0322 |
0.9549 |
0.9704 |
0.693 |
0.763 |
| 1¼ |
1.25 |
7 |
1.1572 |
1.0799 |
1.0954 |
0.89 |
0.969 |
| 1-3/8 |
1.375 |
6 |
1.2667 |
1.1766 |
1.1946 |
1.054 |
1.155 |
| 1½ |
1.5 |
6 |
1.3917 |
1.3016 |
1.3196 |
1.294 |
1.405 |
| 1¾ |
1.75 |
5 |
1.6201 |
1.5119 |
1.5335 |
1.74 |
1.9 |
| 2 |
2 |
4 |
1.8557 |
1.7353 |
1.7594 |
2.3 |
2.5 |
| 2¼ |
2.25 |
4 |
2.1057 |
1.9853 |
2.0094 |
3.02 |
3.25 |
| 2½ |
2.5 |
4 |
2.3376 |
2.2023 |
2.2294 |
3.72 |
4 |
| 2¾ |
2.75 |
4 |
2.5876 |
2.4523 |
2.4794 |
4.62 |
4.93 |
| 3 |
3 |
4 |
2.8376 |
2.7023 |
2.7294 |
5.62 |
5.97 |
| 3¼ |
3.25 |
4 |
3.0876 |
2.9523 |
2.9794 |
6.72 |
7.1 |
| 3½ |
3.5 |
4 |
3.3376 |
3.2023 |
3.2294 |
7.92 |
8.33 |
| 3¾ |
3.75 |
4 |
3.5876 |
3.4523 |
3.4794 |
9.21 |
9.66 |
| 4 |
4 |
4 |
3.8376 |
3.7023 |
3.7294 |
10.61 |
11.08 |
| # |
inch |
tpi |
inch |
inch |
inch |
sq. inch |
sq. inch |
| Size |
Major Dia |
Threads Per Inch |
Pitch Dia |
Minor Dia Externala |
Minor Dia Internalb |
Minor Dia Area |
Tensile Stress Area |
| * Secondary Size |
aForm for UNR thread |
bBasic Minor Diameter |
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