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Thread Pitch Chart
|
Coarse Thread Series - UNC |
Fine Thread Series -
UNF |
8-Thread Series - 8UN |
|
Nominal
Size
and
Threads
Per In. |
Basic
Pitch
Dia |
Section
at
Minor
Dia |
Tensile
Stress
Area |
Nominal
Size
and
Threads
Per In. |
Basic
Pitch Dia |
Section
at
Minor
Dia |
Tensile
Stress
Area |
Nominal
Size
and
Threads
Per In. |
Basic
Pitch Dia |
Section at Minor Dia |
Tensile Stress
Area |
|
In. |
sq in. |
sq in. |
In. |
sq in. |
sq in. |
In. |
sq in. |
sq in. |
|
--
-- |
-- |
-- |
-- |
0 - 80 |
0.0519 |
0.00151 |
0.00180 |
--
-- |
-- |
-- |
-- |
|
1 - 64 |
0.0629 |
0.00218 |
0.00263 |
1 - 72 |
0.0640 |
0.00237 |
0.00278 |
|
2 - 56 |
0.0744 |
0.00310 |
0.00370 |
2 - 64 |
0.0759 |
0.00339 |
0.00394 |
|
3 - 48 |
0.0855 |
0.00406 |
0.00487 |
3 - 56 |
0.0874 |
0.00451 |
0.00523 |
|
4 - 40 |
0.0958
0.1088 0.1177 0.1437 |
0.00496 0.00672 0.00745 0.01196 |
0.00604 0.00796 0.00909 0.0140 |
4 - 48 |
0.0985
0.1102 0.1218 0.1460 |
0.00566 0.00716 0.00874 0.01285 |
0.00661 0.00830 0.01015 0.01474 |
--
-- |
-- |
-- |
-- |
|
5 - 40 |
5 - 44 |
|
6 - 32 |
6 - 40 |
|
8 - 32 |
8 - 36 |
|
10 -
24 |
0.1629 |
0.01450 |
0.0175 |
10 -
32 |
0.1697 |
0.0175 |
0.0200 |
--
-- |
-- |
-- |
-- |
|
12 -
24 |
0.1889 |
0.0206 |
0.0242 |
12 -
28 |
0.1928 |
0.0226 |
0.0258 |
--
-- |
-- |
-- |
-- |
|
1/4 -
20 |
0.2175 |
0.0269 |
0.0318 |
1/4 -
28 |
0.2268 |
0.0326 |
0.0364 |
--
-- |
-- |
-- |
-- |
|
5/16 -
18 |
0.2764 |
0.0454 |
0.0524 |
5/16 -
24 |
0.2854 |
0.0524 |
0.0580 |
--
-- |
-- |
-- |
-- |
|
3/8 -
16 |
0.3344 |
0.0678 |
0.0775 |
3/8 -
24 |
0.3479 |
0.0809 |
0.0878 |
--
-- |
-- |
-- |
-- |
|
7/16 -
14 |
0.3911 |
0.0933 |
0.1063 |
7/16 -
20 |
0.4050 |
0.1090 |
0.1187 |
--
-- |
-- |
-- |
-- |
|
1/2 -
13 |
0.4500 |
0.1257 |
0.1419 |
1/2 -
20 |
0.4675 |
0.1486 |
0.1599 |
--
-- |
-- |
-- |
-- |
|
9/16 -
12 |
0.5084 |
0.162 |
0.182 |
9/16 -
18 |
0.5264 |
0.189 |
0.203 |
--
-- |
-- |
-- |
-- |
|
5/8 -
11 |
0.5660 |
0.202 |
0.226 |
5/8 -
18 |
0.5889 |
0.240 |
0.256 |
--
-- |
-- |
-- |
-- |
|
3/4 -
10 |
0.6850 |
0.302 |
0.334 |
3/4 -
16 |
0.7094 |
0.351 |
0.373 |
--
-- |
-- |
-- |
-- |
|
7/8 -
9 |
0.8028 |
0.419 |
0.462 |
7/8 -
14 |
0.8286 |
0.180 |
0.509 |
--
-- |
-- |
-- |
-- |
|
1 - 8 |
0.9188 |
0.551 |
0.606 |
1 - 12 |
0.9459 |
0.625 |
0.663 |
1 - 8 |
0.9188 |
0.551 |
0.606 |
|
1⅛ - 7 |
1.0322 |
0.693 |
0.763 |
1⅛ -
12 |
1.0709 |
0.812 |
0.856 |
1⅛ - 8 |
1.0438 |
0.728 |
0.790 |
|
1¼ - 7 |
1.1572 |
0.890 |
0.969 |
1¼ -
12 |
1.1959 |
1.024 |
1.073 |
1¼ - 8 |
1.1688 |
0.929 |
1.000 |
|
1⅜ - 6 |
1.2667 |
1.054 |
1.155 |
1⅜ -
12 |
1.3209 |
1.260 |
1.315 |
1⅜ - 8 |
1.2938 |
1.155 |
1.233 |
|
1½ - 6 |
1.3917 |
1.294 |
1.405 |
1½ -
12 |
1.4459 |
1.521 |
1.581 |
1½ - 8 |
1.4188 |
1.405 |
4.492 |
|
--
-- |
-- |
-- |
-- |
--
-- |
-- |
-- |
-- |
1⅝ - 8 |
1.5438 |
1.68 |
1.78 |
|
1¾ - 5 |
1.6201 |
1.74 |
1.90 |
--
-- |
-- |
-- |
-- |
1¾ - 8 |
1.6688 |
1.98 |
2.08 |
|
--
-- |
-- |
-- |
-- |
--
-- |
-- |
-- |
-- |
1⅞ - 8 |
1.7938 |
2.30 |
2.41 |
|
2 - 4½ |
1.8557 |
2.30 |
2.50 |
--
-- |
-- |
-- |
-- |
2 - 8 |
1.9188 |
2.65 |
2.77 |
|
2¼ -
4½ |
2.1057 |
3.02 |
3.25 |
--
-- |
-- |
-- |
-- |
2¼ - 8 |
2.1688 |
3.42 |
3.56 |
|
2½ - 4 |
2.3376 |
3.72 |
4.00 |
--
-- |
-- |
-- |
-- |
2½ - 8 |
2.4188 |
4.29 |
4.44 |
|
2¾ - 4 |
2.5876 |
4.62 |
4.93 |
--
-- |
-- |
-- |
-- |
2¾ - 8 |
2.6688 |
5.26 |
5.43 |
|
3 - 4 |
2.8376 |
5.62 |
5.97 |
--
-- |
-- |
-- |
-- |
3 - 8 |
2.9188 |
6.32 |
6.51 |
|
3¼ - 4 |
3.0876 |
6.72 |
7.10 |
--
-- |
-- |
-- |
-- |
3¼ - 8 |
3.1688 |
7.49 |
7.69 |
|
3½ - 4 |
3.3376 |
7.92 |
8.33 |
|
