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Fastener
and Screw / Bolt Design, Formula and Calculations
Related:
ANSI/ ASME EXTERNAL Screw Thread
Size Chart. All units are in inches. Unified
Screw Threads per. ANSI/ASME B1.1-1989 (R2001),
R2001) Nomenclature, are used. Acceptability criteria
are described in ANSI/ASME B1.3M-1992 (R2001).
Note: This screw chart is not
comprehensive of all available standard threads
as provided by the standard.
See also (link):
ANSI Internal Screw Threads Size Chart
|
External Thread Screw Threads
Size Chart
Screw Size |
Class Thread |
Major Diameter |
Pitch Diameter |
Minor Diameter |
Basica |
Max. |
Min. |
Max. |
Min. |
Max. |
0-80 |
2A |
0.0600 |
0.0595 |
0.0563 |
0.0514 |
0.0496 |
0.0442 |
0-80 |
3A |
0.0600 |
0.0600 |
0.0568 |
0.0519 |
0.0506 |
0.0447 |
1-64 |
2A |
0.0730 |
0.0724 |
0.0686 |
0.0623 |
0.0603 |
0.0532 |
1-64 |
3A |
0.0730 |
0.0730 |
0.0692 |
0.0629 |
0.0614 |
0.0538 |
1-72 |
2A |
0.0730 |
0.0724 |
0.0689 |
0.0634 |
0.0615 |
0.0554 |
1-72 |
3A |
0.0730 |
0.0730 |
0.0695 |
0.0640 |
0.0626 |
0.0560 |
2-56 |
2A |
0.0860 |
0.0854 |
0.0813 |
0.0738 |
0.0717 |
0.0635 |
2-56 |
3A |
0.0860 |
0.0860 |
0.0819 |
0.0744 |
0.0728 |
0.0641 |
2-64 |
2A |
0.0860 |
0.0854 |
0.0816 |
0.0753 |
0.0733 |
0.0662 |
2-64 |
3A |
0.0860 |
0.0860 |
0.0822 |
0.0759 |
0.0744 |
0.0668 |
3-48 |
2A |
0.0990 |
0.0983 |
0.0938 |
0.0848 |
0.0825 |
0.0727 |
3-48 |
3A |
0.0990 |
0.0990 |
0.0945 |
0.0855 |
0.0838 |
0.0734 |
3-56 |
2A |
0.0990 |
0.0983 |
0.0942 |
0.0867 |
0.0845 |
0.0764 |
3-56 |
3A |
0.0990 |
0.0990 |
0.0949 |
0.0874 |
0.0858 |
0.0771 |
4-40 |
2A |
0.1120 |
0.1112 |
0.1061 |
0.0950 |
0.0925 |
0.0805 |
4-40 |
3A |
0.1120 |
0.1120 |
0.1069 |
0.0958 |
0.0939 |
0.0813 |
4-48 |
2A |
0.1120 |
0.1113 |
0.1068 |
0.0978 |
0.0954 |
0.0857 |
4-48 |
3A |
0.1120 |
0.1120 |
0.1075 |
0.0985 |
0.0967 |
0.0864 |
5-40 |
2A |
0.1250 |
0.1242 |
0.1191 |
0.1080 |
0.1054 |
0.0935 |
5-40 |
3A |
0.1250 |
0.1250 |
0.1199 |
0.1088 |
0.1069 |
0.0943 |
5-44 |
2A |
0.1250 |
0.1243 |
0.1195 |
0.1095 |
0.1070 |
0.0964 |
5-44 |
3A |
0.1250 |
0.1250 |
0.1202 |
0.1102 |
0.1083 |
0.0971 |
6-32 |
2A |
0.1380 |
0.1372 |
0.1312 |
0.1169 |
0.1141 |
0.0989 |
6-32 |
3A |
0.1380 |
0.1380 |
0.1320 |
0.1177 |
0.1156 |
0.0997 |
6-40 |
2A |
0.1380 |
0.1372 |
0.1321 |
0.1210 |
0.1184 |
0.1065 |
6-40 |
3A |
0.1380 |
0.1380 |
0.1329 |
0.1218 |
0.1198 |
0.1073 |
8-32 |
2A |
0.1640 |
0.1631 |
0.1571 |
0.1428 |
0.1399 |
0.1248 |
8-32 |
3A |
0.1640 |
0.1640 |
0.1580 |
0.1437 |
0.1415 |
0.1257 |
8-36 |
2A |
0.1640 |
0.1632 |
0.1577 |
0.1452 |
0.1424 |
0.1291 |
8-36 |
3A |
0.1640 |
0.1640 |
0.1585 |
0.1460 |
0.1439 |
0.1299 |
10-24 |
2A |
0.1900 |
0.1890 |
0.1818 |
0.1619 |
0.1586 |
0.1379 |
10-24 |
3A |
0.1900 |
0.1900 |
0.1828 |
0.1629 |
0.1604 |
0.1389 |
10-32 |
2A |
0.1900 |
0.1891 |
0.1831 |
0.1688 |
0.1658 |
0.1508 |
10-32 |
3A |
0.1900 |
0.1900 |
0.1840 |
0.1697 |
0.1674 |
0.1517 |
1/4-20 |
2A |
0.2500 |
0.2489 |
0.2408 |
0.2164 |
0.2127 |
0.1876 |
1/4-20 |
3A |
0.2500 |
0.2500 |
0.2419 |
0.2175 |
0.2147 |
0.1887 |
1/4-28 |
2A |
0.2500 |
0.2490 |
0.2425 |
0.2258 |
0.2225 |
0.2052 |
1/4-28 |
3A |
0.2500 |
0.2500 |
0.2435 |
0.2268 |
0.2243 |
0.2062 |
5/16-18 |
2A |
0.3125 |
0.3113 |
0.3026 |
0.2752 |
0.2712 |
0.2431 |
5/16-18 |
3A |
0.3125 |
0.3125 |
0.3038 |
0.2764 |
0.2734 |
0.2443 |
5/16-24 |
2A |
0.3125 |
0.3114 |
0.3042 |
0.2843 |
0.2806 |
0.2603 |
5/16-24 |
3A |
0.3125 |
0.3125 |
0.3053 |
0.2854 |
0.2827 |
0.2614 |
3/8-16 |
2A |
0.3750 |
0.3737 |
0.3643 |
0.3331 |
0.3287 |
0.2970 |
3/8-16 |
3A |
0.3750 |
0.3750 |
0.3656 |
0.3344 |
0.3311 |
0.2983 |
3/8-24 |
2A |
0.3750 |
0.3739 |
0.3667 |
0.3468 |
0.3430 |
0.3228 |
3/8-24 |
3A |
0.3750 |
0.3750 |
0.3678 |
0.3479 |
0.3450 |
0.3239 |
7/16-14 |
2A |
0.4375 |
0.4361 |
0.4258 |
0.3897 |
0.3850 |
0.3485 |
7/16-14 |
3A |
0.4375 |
0.4375 |
0.4272 |
0.3911 |
0.3876 |
0.3499 |
7/16-20 |
2A |
0.4375 |
0.4362 |
0.4281 |
0.4037 |
0.3995 |
0.3749 |
7/16-20 |
3A |
0.4375 |
0.4375 |
0.4294 |
0.4050 |
0.4019 |
0.3762 |
1/2-13 |
2A |
0.5000 |
0.4985 |
0.4876 |
0.4485 |
0.4435 |
0.4041 |
1/2-13 |
3A |
0.5000 |
0.5000 |
0.4891 |
0.4500 |
0.4463 |
0.4056 |
1/2-20 |
2A |
0.5000 |
0.4987 |
0.4906 |
0.4662 |
0.4619 |
0.4374 |
1/2-20 |
3A |
0.5000 |
0.5000 |
0.4919 |
0.4675 |
0.4643 |
0.4387 |
9/16-12 |
2A |
0.5625 |
0.5609 |
0.5495 |
0.5068
|
0.5016 |
0.4617 |
9/16-12 |
3A |
0.5625 |
0.5609 |
0.5495 |
0.5068
|
0.5016 |
0.4617 |
9/16-14 |
2A |
0.5625 |
0.5510 |
0.5507 |
0.5146 |
0.5096 |
0.4760 |
9/16-16 |
2A |
0.5625 |
0.5611 |
0.5517 |
0.5205 |
0.5158 |
0.4866 |
9/16-16 |
3A |
0.5625 |
0.5625 |
0.5531 |
0.5219 |
0.5184 |
0.4880 |
9/16-18 |
2A |
0.5625 |
0.5611 |
0.5524 |
0.5250 |
0.5205 |
0.4950 |
9/16-18 |
3A |
0.5625 |
0.5625 |
0.5538 |
0.5264 |
0.5230 |
0.4964 |
9/16-20 |
2A |
0.5625 |
0.5612 |
0.5531 |
0.5287 |
0.5245 |
0.5017 |
9/16-20 |
3A |
0.5625 |
0.5625 |
0.5544 |
0.5300 |
0.5268 |
0.5030 |
9/16-24 |
2A |
0.5625 |
0.5613 |
0.5541 |
0.5342 |
0.5303 |
0.5117 |
9/16-24 |
3A |
0.5625 |
0.5625 |
0.5553 |
0.5354 |
0.5325 |
0.5129 |
9/16-32 |
2A |
0.5625 |
0.5615 |
0.5555 |
0.5412 |
0.5377 |
0.5243 |
9/16-32 |
3A |
0.5625 |
0.5625 |
0.5565 |
0.5422 |
0.5396 |
0.5253 |
5/8-11 |
2A |
0.6250 |
0.6234 |
0.6113 |
0.5644 |
0.5589 |
0.5119 |
5/8-11 |
3A |
0.6250 |
0.6250 |
0.6129 |
0.5660 |
0.5619 |
0.5135 |
5/8-18 |
2A |
0.6250 |
0.6236 |
0.6149 |
0.5875 |
0.5828 |
0.5554 |
5/8-18 |
3A |
0.6250 |
0.6250 |
0.6163 |
0.5889 |
0.5854 |
0.5568 |
3/4-10 |
2A |
0.7500 |
0.7482 |
0.7353 |
0.6832 |
0.6773 |
0.6255 |
3/4-10 |
3A |
0.7500 |
0.7500 |
0.7371 |
0.6850 |
0.6806 |
0.6273 |
3/4-16 |
2A |
0.7500 |
0.7485 |
0.7391 |
0.7079 |
0.7029 |
0.6718 |
3/4-16 |
3A |
0.7500 |
0.7500 |
0.7406 |
0.7094 |
0.7056 |
0.6733 |
7/8
-9 |
2A |
0.8750 |
0.8731 |
0.8592 |
0.8009 |
0.7946 |
0.7368 |
7/8
-9 |
3A |
0.8750 |
0.8750 |
0.8611 |
0.8028 |
0.7981 |
0.7387 |
7/8-14 |
2A |
0.8750 |
0.8734 |
0.8631 |
0.8270 |
0.8216 |
0.7858 |
7/8-14 |
3A |
0.8750 |
0.8750 |
0.8647 |
0.8286 |
0.8245 |
0.7874 |
1
-8 |
2A |
1.0000 |
0.9980 |
0.9830 |
0.9168 |
0.9100 |
0.8446 |
1
-8 |
3A |
1.0000 |
1.0000 |
0.9850 |
0.9188 |
0.9137 |
0.8466 |
1
-12 |
2A |
1.0000 |
0.9982 |
0.9868 |
0.9441 |
0.9382 |
0.8960 |
1
-12 |
3A |
1.0000 |
1.0000 |
0.9886 |
0.9459 |
0.9415 |
0.8978 |
1-1/8-7 |
2A |
1.1250 |
1.1228 |
1.1064 |
1.0300 |
1.0228 |
0.9475 |
1-1/8-12 |
2A |
1.1250 |
1.1232 |
1.1118 |
1.0691 |
1.0631 |
1.0210 |
1-1/4-7 |
2A |
1.2500 |
1.2478 |
1.2314 |
1.1550 |
1.1476 |
1.0725 |
1-1/4-12 |
2A |
1.2500 |
1.2482 |
1.2368 |
1.1941 |
1.1879 |
1.1460 |
1-3/8-6 |
2A |
1.3750 |
1.3726 |
1.3544 |
1.2643 |
1.2563 |
1.1681 |
1-3/8-12 |
2A |
1.3750 |
1.3731 |
1.3617 |
1.3190 |
1.3127 |
1.2709 |
1-1/2-6 |
2A |
1.5000 |
1.4976 |
1.4794 |
1.3893 |
1.3812 |
1.2931 |
1-1/2-12 |
2A |
1.5000 |
1.4981 |
1.4867 |
1.4440 |
1.4376 |
1.3959 |
1-3/4-5 |
2A |
1.7500 |
1.7473 |
1.7268 |
1.6174 |
1.6085 |
1.5019 |
2
- 6 |
2A |
2.0000 |
1.9971 |
1.9751 |
1.8528 |
1.8433 |
1.7245 |
a. Basic = Nominal
|