ANSI Internal Screw Threads Size and Tolerances Table Chart (2024)

ANSI Internal Screw Threads Size and Tolerances Table Chart

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Fastener and Screw Design, Formula Calculations

ANSI/ ASME INTERNAL 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
Thread Chart (UNF-UNC) - Major and Minor Diameters

ANSI External Screw Threads Size Chart

Screw Size Class
Thread		 Basica Minor Diameter Major
Diameter
Min. Max. Min.
0-80 2B 0.0600 0.0465 0.0514 0.0600
0-80 3B 0.0600 0.0465 0.0514 0.0600
1-64 2B 0.0730 0.0561 0.0623 0.0730
1-64 3B 0.0730 0.0561 0.0623 0.0730
1-72 2B 0.0730 0.0580 0.0635 0.0730
1-72 3B 0.0730 0.0580 0.0635 0.0730
2-56 2B 0.0860 0.0667 0.0737 0.0860
2-56 3B 0.0860 0.0667 0.0737 0.0860
2-64 2B 0.0860 0.0691 0.0753 0.0860
2-64 3B 0.0860 0.0691 0.0753 0.0860
3-48 2B 0.0990 0.0764 0.0845 0.0990
3-48 3B 0.0990 0.0764 0.0845 0.0990
3-56 2B 0.0990 0.0797 0.0865 0.0990
3-56 3B 0.0990 0.0797 0.0865 0.0990
4-40 2B 0.1120 0.0849 0.0939 0.1120
4-40 3B 0.1120 0.0849 0.0939 0.1120
4-48 2B 0.1120 0.0894 0.0968 0.1120
4-48 3B 0.1120 0.0894 0.0968 0.1120
5-40 2B 0.1250 0.0979 0.1062 0.1250
5-40 3B 0.1250 0.0979 0.1062 0.1250
5-44 2B 0.1250 0.1004 0.1079 0.1250
5-44 3B 0.1250 0.1004 0.1079 0.1250
6-32 2B 0.1380 0.1040 0.1140 0.1380
6-32 3B 0.1380 0.1040 0.1140 0.1380
6-40 2B 0.1380 0.1110 0.119 0.1380
6-40 3B 0.1380 0.1110 0.1186 0.1380
8-32 2B 0.1640 0.1300 0.139 0.1640
8-32 3B 0.1640 0.1300 0.1389 0.1640
8-36 2B 0.1640 0.1340 0.142 0.1640
8-36 3B 0.1640 0.1340 0.1416 0.1640
10-24 2B 0.1900 0.1450 0.1560 0.1900
10-24 3B 0.1900 0.1450 0.1555 0.1900
10-32 2B 0.1900 0.1560 0.1640 0.1900
10-32 3B 0.1900 0.1560 0.1641 0.1900
1/4-20 2B 0.2500 0.1960 0.2070 0.2500
1/4-20 3B 0.2500 0.1960 0.2070 0.2500
1/4-28 2B 0.2500 0.2110 0.220 0.2500
1/4-28 3B 0.2500 0.2110 0.2190 0.2500
5/16-18 2B 0.3125 0.2520 0.265 0.3125
5/16-18 3B 0.3125 0.2520 0.2630 0.3125
5/16-24 2B 0.3125 0.2670 0.277 0.3125
5/16-24 3B 0.3125 0.2670 0.2754 0.3125
3/8-16 2B 0.3750 0.3070 0.321 0.3750
3/8-16 3B 0.3750 0.3070 0.3182 0.3750
3/8-24 2B 0.3750 0.3300 0.340 0.3750
3/8-24 3B 0.3750 0.3300 0.3372 0.3750
7/16-14 2B 0.4375 0.3600 0.376 0.4375
7/16-14 3B 0.4375 0.3600 0.3717 0.4375
7/16-20 2B 0.4375 0.3830 0.395 0.4375
7/16-20 3B 0.4375 0.3830 0.3916 0.4375
1/2-13 2B 0.5000 0.4170 0.434 0.5000
1/2-13 3B 0.5000 0.4170 0.4284 0.5000
1/2-20 2B 0.5000 0.4460 0.457 0.5000
1/2-20 3B 0.5000 0.4460 0.4537 0.5000
9/16-12 2B 0.5625 0.4720 0.4900 0.5625
9/16-12 3B 0.5625 0.4720 0.4843 0.5625
9/16-14 2B 0.5625 0.4850 0.5010 0.5625
9/16-16 2B 0.5625 0.4950 0.5090 0.5625
9/16-16 3B 0.5625 0.4950 0.5040 0.5625
9/16-18 2B 0.5625 0.5020 0.5150 0.5625
9/16-18 3B 0.5625 0.5020 0.5106 0.5625
9/16-20 2B 0.5625 0.5080 0.5200 0.5625
9/16-20 3B 0.5625 0.5080 0.5162 0.5625
9/16-24 2B 0.5625 0.5170 0.5270 0.5625
9/16-24 3B 0.5625 0.5170 0.5244 0.5625
9/16-32 2B 0.5625 0.5290 0.5360 0.5625
9/16-32 3B 0.5625 0.5290 0.5344 0.5625
5/8-11 2B 0.6250 0.5270 0.546 0.6250
5/8-11 3B 0.6250 0.5270 0.5391 0.6250
5/8-18 2B 0.6250 0.5650 0.578 0.6250
5/8-18 3B 0.6250 0.5650 0.5730 0.6250
3/4-10 2B 0.7500 0.6420 0.663 0.7500
3/4-10 3B 0.7500 0.6420 0.6545 0.7500
3/4-16 2B 0.7500 0.6820 0.696 0.7500
3/4-16 3B 0.7500 0.6820 0.6908 0.7500
7/8 -9 2B 0.8750 0.7550 0.778 0.8750
7/8 -9 3B 0.8750 0.7550 0.7681 0.8750
7/8-14 2B 0.8750 0.7980 0.814 0.8750
7/8-14 3B 0.8750 0.7980 0.8068 0.8750
1 -8 2B 1.0000 0.8650 0.890 1.0000
1 -8 3B 1.0000 0.8650 0.8797 1.0000
1 -12 2B 1.0000 0.9100 0.928 1.0000
1 -12 3B 1.0000 0.9100 0.9198 1.0000
1 1/8-7 2B 1.1250 0.9700 0.998 1.1250
1 1/8-12 2B 1.1250 1.0350 1.053 1.1250
1 1/4-7 2B 1.2500 1.0950 1.123 1.2500
1 1/4-12 2B 1.2500 1.1600 1.178 1.2500
1 3/8-6 2B 1.3750 1.1950 1.225 1.3750
1 3/8-12 2B 1.3750 1.2850 1.303 1.3750
1 1/2-6 2B 1.5000 1.3200 1.350 1.5000
1 1/2-12 2B 1.5000 1.4100 1.428 1.5000
1 3/4-5 2B 1.7500 1.5340 1.568 1.7500
2 -6 2B 2.0000 1.820 1.850 2.0000
Screw Size Class
Thread		 Pitch Diameter
Min. Max.
0-80 2B 0.0519 0.0542
0-80 3B 0.0519 0.0536
1-64 2B 0.0629 0.0655
1-64 3B 0.0629 0.0648
1-72 2B 0.0640 0.0665
1-72 3B 0.0640 0.0659
2-56 2B 0.0744 0.0772
2-56 3B 0.0744 0.0765
2-64 2B 0.0759 0.0786
2-64 3B 0.0759 0.0779
3-48 2B 0.0855 0.0885
3-48 3B 0.0855 0.0877
3-56 2B 0.0874 0.0902
3-56 3B 0.0874 0.0895
4-40 2B 0.0958 0.0991
4-40 3B 0.0958 0.0982
4-48 2B 0.0985 0.1016
4-48 3B 0.0985 0.1008
5-40 2B 0.1088 0.1121
5-40 3B 0.1088 0.1113
5-44 2B 0.1102 0.1134
5-44 3B 0.1102 0.1126
6-32 2B 0.1177 0.1214
6-32 3B 0.1177 0.1204
6-40 2B 0.1218 0.1252
6-40 3B 0.1218 0.1243
8-32 2B 0.1437 0.1475
8-32 3B 0.1437 0.1465
8-36 2B 0.1460 0.1496
8-36 3B 0.1460 0.1487
10-24 2B 0.1629 0.1672
10-24 3B 0.1629 0.1661
10-32 2B 0.1697 0.1736
10-32 3B 0.1697 0.1726
1/4-20 2B 0.2175 0.2248
1/4-20 3B 0.2175 0.2211
1/4-28 2B 0.2268 0.2311
1/4-28 3B 0.2268 0.2300
5/16-18 2B 0.2764 0.2817
5/16-18 3B 0.2764 0.2803
5/16-24 2B 0.2854 0.2902
5/16-24 3B 0.2854 0.2890
3/8-16 2B 0.3344 0.3401
3/8-16 3B 0.3344 0.3387
3/8-24 2B 0.3479 0.3528
3/8-24 3B 0.3479 0.3516
7/16-14 2B 0.3911 0.3972
7/16-14 3B 0.3911 0.3957
7/16-20 2B 0.4050 0.4104
7/16-20 3B 0.4050 0.4091
1/2-13 2B 0.4500 0.4565
1/2-13 3B 0.4500 0.4548
1/2-20 2B 0.4675 0.4731
1/2-20 3B 0.4675 0.4717
9/16-12 2B 0.5084 0.5152
9/16-12 3B 0.5084 0.5135
9/16-14 2B 0.5161 0.5226
9/16-16 2B 0.5219 0.5280
9/16-16 3B 0.5219 0.5265
9/16-18 2B 0.5264 0.5323
9/16-18 3B 0.5264 0.5308
9/16-20 2B 0.5300 0.5355
9/16-20 3B 0.5300 0.5341
9/16-24 2B 0.5354 0.5404
9/16-24 3B 0.5354 0.5392
9/16-32 2B 0.5422 0.5467
9/16-32 3B 0.5422 0.5456
5/8-11 2B 0.5660 0.5732
5/8-11 3B 0.5660 0.5714
5/8-18 2B 0.5889 0.5949
5/8-18 3B 0.5889 0.5934
3/4-10 2B 0.6850 0.6927
3/4-10 3B 0.6850 0.6907
3/4-16 2B 0.7094 0.7159
3/4-16 3B 0.7094 0.7143
7/8 -9 2B 0.8028 0.8110
7/8 -9 3B 0.8028 0.8089
7/8-14 2B 0.8286 0.8356
7/8-14 3B 0.8286 0.8339
1 -8 2B 0.9188 0.9276
1 -8 3B 0.9188 0.9254
1 -12 2B 0.9459 0.9535
1 -12 3B 0.9459 0.9516
1 1/8-7 2B 1.0322 1.0416
1 1/8-12 2B 1.0709 1.0787
1 1/4-7 2B 1.1572 1.1668
1 1/4-12 2B 1.1959 1.2039
1 3/8-6 2B 1.2667 1.2771
1 3/8-12 2B 1.3209 1.3291
1 1/2-6 2B 1.3917 1.4022
1 1/2-12 2B 1.4459 1.4542
1 3/4-5 2B 1.6201 1.6317
2 -6 2B 1.8917 1.9028

a. Basic = Nominal

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ANSI Internal Screw Threads Size and Tolerances Table Chart (2024)

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