Is there a pitch diameter table for UNC, UNF and UNEF threads?

Last updated 10 August 2026

Yes, below, and it is computed rather than transcribed: every UNC, UNF and UNEF size across four classes, from the basic geometry and the ASME B1.1 tolerance formula.

Every other thread table on the internet is a transcription, which means it can be wrong in one row and nobody can tell by looking. This one is derived, the method is published beside it, and rows across fifteen sizes are pinned against printed tables in the engine's own tests. You can check the arithmetic rather than having to trust the typist.

The one thing a derived table has to get right and a transcribed one never has to think about is the length of engagement the tolerance is computed at. It is not the same for every series: the major diameter for coarse and fine, nine pitches for extra fine. Using the wrong one moves both limits by about a ten-thousandth, which no reader would catch and a thread gauge would. Every row here carries the convention it was computed at.

The constant-pitch UN series is not here, and that is the same principle from the other side. No published UN row could be checked, the engagement convention demonstrably varies between series, and a generated table on an assumed one would be wrong in a way nobody could see.

Classes 1A and 1B are not here either. Their tolerance relationship is widely repeated and we could not verify it against a printed table, so they are absent rather than approximated. Major and minor diameter limits are absent for the same reason: a different set of formulas this engine does not carry.

The table

Size	Class	Basic PD	Allowance	Tolerance	PD max	PD min
#1-64 UNC	2A	0.0629	0.0006	0.002	0.0623	0.0603
#1-64 UNC	3A	0.0629	none	0.0015	0.0629	0.0614
#1-64 UNC	2B	0.0629	none	0.0026	0.0655	0.0629
#1-64 UNC	3B	0.0629	none	0.0019	0.0648	0.0629
#2-56 UNC	2A	0.0744	0.0006	0.0021	0.0738	0.0717
#2-56 UNC	3A	0.0744	none	0.0016	0.0744	0.0728
#2-56 UNC	2B	0.0744	none	0.0028	0.0772	0.0744
#2-56 UNC	3B	0.0744	none	0.0021	0.0765	0.0744
#3-48 UNC	2A	0.0855	0.0007	0.0023	0.0848	0.0825
#3-48 UNC	3A	0.0855	none	0.0017	0.0855	0.0838
#3-48 UNC	2B	0.0855	none	0.003	0.0885	0.0855
#3-48 UNC	3B	0.0855	none	0.0022	0.0877	0.0855
#4-40 UNC	2A	0.0958	0.0008	0.0025	0.095	0.0925
#4-40 UNC	3A	0.0958	none	0.0019	0.0958	0.0939
#4-40 UNC	2B	0.0958	none	0.0033	0.0991	0.0958
#4-40 UNC	3B	0.0958	none	0.0024	0.0982	0.0958
#5-40 UNC	2A	0.1088	0.0008	0.0026	0.108	0.1054
#5-40 UNC	3A	0.1088	none	0.0019	0.1088	0.1069
#5-40 UNC	2B	0.1088	none	0.0033	0.1121	0.1088
#5-40 UNC	3B	0.1088	none	0.0025	0.1113	0.1088
#6-32 UNC	2A	0.1177	0.0008	0.0028	0.1169	0.1141
#6-32 UNC	3A	0.1177	none	0.0021	0.1177	0.1156
#6-32 UNC	2B	0.1177	none	0.0037	0.1214	0.1177
#6-32 UNC	3B	0.1177	none	0.0028	0.1205	0.1177
#8-32 UNC	2A	0.1437	0.0009	0.0029	0.1428	0.1399
#8-32 UNC	3A	0.1437	none	0.0022	0.1437	0.1415
#8-32 UNC	2B	0.1437	none	0.0038	0.1475	0.1437
#8-32 UNC	3B	0.1437	none	0.0028	0.1465	0.1437
#10-24 UNC	2A	0.1629	0.001	0.0033	0.1619	0.1586
#10-24 UNC	3A	0.1629	none	0.0025	0.1629	0.1604
#10-24 UNC	2B	0.1629	none	0.0043	0.1672	0.1629
#10-24 UNC	3B	0.1629	none	0.0032	0.1661	0.1629
#12-24 UNC	2A	0.1889	0.001	0.0034	0.1879	0.1845
#12-24 UNC	3A	0.1889	none	0.0025	0.1889	0.1864
#12-24 UNC	2B	0.1889	none	0.0044	0.1933	0.1889
#12-24 UNC	3B	0.1889	none	0.0033	0.1922	0.1889
1/4-20 UNC	2A	0.2175	0.0011	0.0037	0.2164	0.2127
1/4-20 UNC	3A	0.2175	none	0.0028	0.2175	0.2147
1/4-20 UNC	2B	0.2175	none	0.0048	0.2223	0.2175
1/4-20 UNC	3B	0.2175	none	0.0036	0.2211	0.2175
5/16-18 UNC	2A	0.2764	0.0012	0.004	0.2752	0.2712
5/16-18 UNC	3A	0.2764	none	0.003	0.2764	0.2734
5/16-18 UNC	2B	0.2764	none	0.0053	0.2817	0.2764
5/16-18 UNC	3B	0.2764	none	0.0039	0.2803	0.2764
3/8-16 UNC	2A	0.3344	0.0013	0.0044	0.3331	0.3287
3/8-16 UNC	3A	0.3344	none	0.0033	0.3344	0.3311
3/8-16 UNC	2B	0.3344	none	0.0057	0.3401	0.3344
3/8-16 UNC	3B	0.3344	none	0.0043	0.3387	0.3344
7/16-14 UNC	2A	0.3911	0.0014	0.0047	0.3897	0.385
7/16-14 UNC	3A	0.3911	none	0.0035	0.3911	0.3876
7/16-14 UNC	2B	0.3911	none	0.0061	0.3972	0.3911
7/16-14 UNC	3B	0.3911	none	0.0046	0.3957	0.3911
1/2-13 UNC	2A	0.45	0.0015	0.005	0.4485	0.4435
1/2-13 UNC	3A	0.45	none	0.0037	0.45	0.4463
1/2-13 UNC	2B	0.45	none	0.0065	0.4565	0.45
1/2-13 UNC	3B	0.45	none	0.0048	0.4548	0.45
9/16-12 UNC	2A	0.5084	0.0016	0.0052	0.5068	0.5016
9/16-12 UNC	3A	0.5084	none	0.0039	0.5084	0.5045
9/16-12 UNC	2B	0.5084	none	0.0068	0.5152	0.5084
9/16-12 UNC	3B	0.5084	none	0.0051	0.5135	0.5084
5/8-11 UNC	2A	0.566	0.0017	0.0055	0.5643	0.5588
5/8-11 UNC	3A	0.566	none	0.0041	0.566	0.5619
5/8-11 UNC	2B	0.566	none	0.0072	0.5732	0.566
5/8-11 UNC	3B	0.566	none	0.0054	0.5714	0.566
3/4-10 UNC	2A	0.685	0.0018	0.0059	0.6832	0.6773
3/4-10 UNC	3A	0.685	none	0.0044	0.685	0.6806
3/4-10 UNC	2B	0.685	none	0.0077	0.6927	0.685
3/4-10 UNC	3B	0.685	none	0.0057	0.6907	0.685
7/8-9 UNC	2A	0.8028	0.0019	0.0063	0.8009	0.7946
7/8-9 UNC	3A	0.8028	none	0.0047	0.8028	0.7981
7/8-9 UNC	2B	0.8028	none	0.0082	0.811	0.8028
7/8-9 UNC	3B	0.8028	none	0.0061	0.8089	0.8028
1-8 UNC	2A	0.9188	0.002	0.0068	0.9168	0.91
1-8 UNC	3A	0.9188	none	0.0051	0.9188	0.9137
1-8 UNC	2B	0.9188	none	0.0088	0.9276	0.9188
1-8 UNC	3B	0.9188	none	0.0066	0.9254	0.9188
1-1/8-7 UNC	2A	1.0322	0.0022	0.0073	1.03	1.0227
1-1/8-7 UNC	3A	1.0322	none	0.0054	1.0322	1.0268
1-1/8-7 UNC	2B	1.0322	none	0.0094	1.0416	1.0322
1-1/8-7 UNC	3B	1.0322	none	0.0071	1.0393	1.0322
1-1/4-7 UNC	2A	1.1572	0.0022	0.0074	1.155	1.1476
1-1/4-7 UNC	3A	1.1572	none	0.0055	1.1572	1.1517
1-1/4-7 UNC	2B	1.1572	none	0.0096	1.1668	1.1572
1-1/4-7 UNC	3B	1.1572	none	0.0072	1.1644	1.1572
1-3/8-6 UNC	2A	1.2667	0.0024	0.008	1.2643	1.2563
1-3/8-6 UNC	3A	1.2667	none	0.006	1.2667	1.2607
1-3/8-6 UNC	2B	1.2667	none	0.0104	1.2771	1.2667
1-3/8-6 UNC	3B	1.2667	none	0.0078	1.2745	1.2667
1-1/2-6 UNC	2A	1.3917	0.0024	0.0081	1.3893	1.3812
1-1/2-6 UNC	3A	1.3917	none	0.0061	1.3917	1.3856
1-1/2-6 UNC	2B	1.3917	none	0.0105	1.4022	1.3917
1-1/2-6 UNC	3B	1.3917	none	0.0079	1.3996	1.3917
#0-80 UNF	2A	0.0519	0.0005	0.0018	0.0514	0.0496
#0-80 UNF	3A	0.0519	none	0.0013	0.0519	0.0506
#0-80 UNF	2B	0.0519	none	0.0023	0.0542	0.0519
#0-80 UNF	3B	0.0519	none	0.0017	0.0536	0.0519
#1-72 UNF	2A	0.064	0.0006	0.0019	0.0634	0.0615
#1-72 UNF	3A	0.064	none	0.0014	0.064	0.0626
#1-72 UNF	2B	0.064	none	0.0025	0.0665	0.064
#1-72 UNF	3B	0.064	none	0.0019	0.0659	0.064
#2-64 UNF	2A	0.0759	0.0006	0.002	0.0753	0.0733
#2-64 UNF	3A	0.0759	none	0.0015	0.0759	0.0744
#2-64 UNF	2B	0.0759	none	0.0027	0.0786	0.0759
#2-64 UNF	3B	0.0759	none	0.002	0.0779	0.0759
#3-56 UNF	2A	0.0874	0.0007	0.0022	0.0867	0.0845
#3-56 UNF	3A	0.0874	none	0.0016	0.0874	0.0858
#3-56 UNF	2B	0.0874	none	0.0028	0.0902	0.0874
#3-56 UNF	3B	0.0874	none	0.0021	0.0895	0.0874
#4-48 UNF	2A	0.0985	0.0007	0.0024	0.0978	0.0954
#4-48 UNF	3A	0.0985	none	0.0018	0.0985	0.0967
#4-48 UNF	2B	0.0985	none	0.0031	0.1016	0.0985
#4-48 UNF	3B	0.0985	none	0.0023	0.1008	0.0985
#5-44 UNF	2A	0.1102	0.0007	0.0025	0.1095	0.107
#5-44 UNF	3A	0.1102	none	0.0019	0.1102	0.1083
#5-44 UNF	2B	0.1102	none	0.0032	0.1134	0.1102
#5-44 UNF	3B	0.1102	none	0.0024	0.1126	0.1102
#6-40 UNF	2A	0.1218	0.0008	0.0026	0.121	0.1184
#6-40 UNF	3A	0.1218	none	0.002	0.1218	0.1198
#6-40 UNF	2B	0.1218	none	0.0034	0.1252	0.1218
#6-40 UNF	3B	0.1218	none	0.0025	0.1243	0.1218
#8-36 UNF	2A	0.146	0.0008	0.0028	0.1452	0.1424
#8-36 UNF	3A	0.146	none	0.0021	0.146	0.1439
#8-36 UNF	2B	0.146	none	0.0036	0.1496	0.146
#8-36 UNF	3B	0.146	none	0.0027	0.1487	0.146
#10-32 UNF	2A	0.1697	0.0009	0.003	0.1688	0.1658
#10-32 UNF	3A	0.1697	none	0.0023	0.1697	0.1674
#10-32 UNF	2B	0.1697	none	0.0039	0.1736	0.1697
#10-32 UNF	3B	0.1697	none	0.0029	0.1726	0.1697
#12-28 UNF	2A	0.1928	0.001	0.0032	0.1918	0.1886
#12-28 UNF	3A	0.1928	none	0.0024	0.1928	0.1904
#12-28 UNF	2B	0.1928	none	0.0042	0.197	0.1928
#12-28 UNF	3B	0.1928	none	0.0031	0.1959	0.1928
1/4-28 UNF	2A	0.2268	0.001	0.0033	0.2258	0.2225
1/4-28 UNF	3A	0.2268	none	0.0025	0.2268	0.2243
1/4-28 UNF	2B	0.2268	none	0.0043	0.2311	0.2268
1/4-28 UNF	3B	0.2268	none	0.0032	0.23	0.2268
5/16-24 UNF	2A	0.2854	0.0011	0.0037	0.2843	0.2806
5/16-24 UNF	3A	0.2854	none	0.0027	0.2854	0.2827
5/16-24 UNF	2B	0.2854	none	0.0048	0.2902	0.2854
5/16-24 UNF	3B	0.2854	none	0.0036	0.289	0.2854
3/8-24 UNF	2A	0.3479	0.0011	0.0038	0.3468	0.343
3/8-24 UNF	3A	0.3479	none	0.0029	0.3479	0.345
3/8-24 UNF	2B	0.3479	none	0.0049	0.3528	0.3479
3/8-24 UNF	3B	0.3479	none	0.0037	0.3516	0.3479
7/16-20 UNF	2A	0.405	0.0013	0.0042	0.4037	0.3995
7/16-20 UNF	3A	0.405	none	0.0031	0.405	0.4019
7/16-20 UNF	2B	0.405	none	0.0054	0.4104	0.405
7/16-20 UNF	3B	0.405	none	0.0041	0.4091	0.405
1/2-20 UNF	2A	0.4675	0.0013	0.0043	0.4662	0.4619
1/2-20 UNF	3A	0.4675	none	0.0032	0.4675	0.4643
1/2-20 UNF	2B	0.4675	none	0.0056	0.4731	0.4675
1/2-20 UNF	3B	0.4675	none	0.0042	0.4717	0.4675
9/16-18 UNF	2A	0.5264	0.0014	0.0045	0.525	0.5205
9/16-18 UNF	3A	0.5264	none	0.0034	0.5264	0.523
9/16-18 UNF	2B	0.5264	none	0.0059	0.5323	0.5264
9/16-18 UNF	3B	0.5264	none	0.0044	0.5308	0.5264
5/8-18 UNF	2A	0.5889	0.0014	0.0047	0.5875	0.5828
5/8-18 UNF	3A	0.5889	none	0.0035	0.5889	0.5854
5/8-18 UNF	2B	0.5889	none	0.006	0.5949	0.5889
5/8-18 UNF	3B	0.5889	none	0.0045	0.5934	0.5889
3/4-16 UNF	2A	0.7094	0.0015	0.005	0.7079	0.7029
3/4-16 UNF	3A	0.7094	none	0.0038	0.7094	0.7056
3/4-16 UNF	2B	0.7094	none	0.0065	0.7159	0.7094
3/4-16 UNF	3B	0.7094	none	0.0049	0.7143	0.7094
7/8-14 UNF	2A	0.8286	0.0016	0.0054	0.827	0.8216
7/8-14 UNF	3A	0.8286	none	0.0041	0.8286	0.8245
7/8-14 UNF	2B	0.8286	none	0.007	0.8356	0.8286
7/8-14 UNF	3B	0.8286	none	0.0053	0.8339	0.8286
1-12 UNF	2A	0.9459	0.0018	0.0059	0.9441	0.9382
1-12 UNF	3A	0.9459	none	0.0044	0.9459	0.9415
1-12 UNF	2B	0.9459	none	0.0076	0.9535	0.9459
1-12 UNF	3B	0.9459	none	0.0057	0.9516	0.9459
1-1/8-12 UNF	2A	1.0709	0.0018	0.006	1.0691	1.0631
1-1/8-12 UNF	3A	1.0709	none	0.0045	1.0709	1.0664
1-1/8-12 UNF	2B	1.0709	none	0.0078	1.0787	1.0709
1-1/8-12 UNF	3B	1.0709	none	0.0059	1.0768	1.0709
1-1/4-12 UNF	2A	1.1959	0.0018	0.0062	1.1941	1.1879
1-1/4-12 UNF	3A	1.1959	none	0.0046	1.1959	1.1913
1-1/4-12 UNF	2B	1.1959	none	0.008	1.2039	1.1959
1-1/4-12 UNF	3B	1.1959	none	0.006	1.2019	1.1959
1-3/8-12 UNF	2A	1.3209	0.0019	0.0063	1.319	1.3127
1-3/8-12 UNF	3A	1.3209	none	0.0047	1.3209	1.3162
1-3/8-12 UNF	2B	1.3209	none	0.0082	1.3291	1.3209
1-3/8-12 UNF	3B	1.3209	none	0.0061	1.327	1.3209
1-1/2-12 UNF	2A	1.4459	0.0019	0.0064	1.444	1.4376
1-1/2-12 UNF	3A	1.4459	none	0.0048	1.4459	1.4411
1-1/2-12 UNF	2B	1.4459	none	0.0083	1.4542	1.4459
1-1/2-12 UNF	3B	1.4459	none	0.0063	1.4522	1.4459
#12-32 UNEF	2A	0.1957	0.001	0.0032	0.1947	0.1915
#12-32 UNEF	3A	0.1957	none	0.0024	0.1957	0.1933
#12-32 UNEF	2B	0.1957	none	0.0041	0.1998	0.1957
#12-32 UNEF	3B	0.1957	none	0.0031	0.1988	0.1957
1/4-32 UNEF	2A	0.2297	0.001	0.0032	0.2287	0.2255
1/4-32 UNEF	3A	0.2297	none	0.0024	0.2297	0.2273
1/4-32 UNEF	2B	0.2297	none	0.0042	0.2339	0.2297
1/4-32 UNEF	3B	0.2297	none	0.0031	0.2328	0.2297
5/16-32 UNEF	2A	0.2922	0.001	0.0033	0.2912	0.2879
5/16-32 UNEF	3A	0.2922	none	0.0025	0.2922	0.2897
5/16-32 UNEF	2B	0.2922	none	0.0043	0.2965	0.2922
5/16-32 UNEF	3B	0.2922	none	0.0032	0.2954	0.2922
3/8-32 UNEF	2A	0.3547	0.001	0.0034	0.3537	0.3503
3/8-32 UNEF	3A	0.3547	none	0.0025	0.3547	0.3522
3/8-32 UNEF	2B	0.3547	none	0.0044	0.3591	0.3547
3/8-32 UNEF	3B	0.3547	none	0.0033	0.358	0.3547
7/16-28 UNEF	2A	0.4143	0.0011	0.0036	0.4132	0.4096
7/16-28 UNEF	3A	0.4143	none	0.0027	0.4143	0.4116
7/16-28 UNEF	2B	0.4143	none	0.0047	0.419	0.4143
7/16-28 UNEF	3B	0.4143	none	0.0035	0.4178	0.4143
1/2-28 UNEF	2A	0.4768	0.0011	0.0037	0.4757	0.472
1/2-28 UNEF	3A	0.4768	none	0.0028	0.4768	0.474
1/2-28 UNEF	2B	0.4768	none	0.0048	0.4816	0.4768
1/2-28 UNEF	3B	0.4768	none	0.0036	0.4804	0.4768
9/16-24 UNEF	2A	0.5354	0.0012	0.004	0.5342	0.5302
9/16-24 UNEF	3A	0.5354	none	0.003	0.5354	0.5324
9/16-24 UNEF	2B	0.5354	none	0.0051	0.5405	0.5354
9/16-24 UNEF	3B	0.5354	none	0.0039	0.5393	0.5354
5/8-24 UNEF	2A	0.5979	0.0012	0.004	0.5967	0.5927
5/8-24 UNEF	3A	0.5979	none	0.003	0.5979	0.5949
5/8-24 UNEF	2B	0.5979	none	0.0052	0.6031	0.5979
5/8-24 UNEF	3B	0.5979	none	0.0039	0.6018	0.5979
11/16-24 UNEF	2A	0.6604	0.0012	0.004	0.6592	0.6552
11/16-24 UNEF	3A	0.6604	none	0.003	0.6604	0.6574
11/16-24 UNEF	2B	0.6604	none	0.0053	0.6657	0.6604
11/16-24 UNEF	3B	0.6604	none	0.0039	0.6643	0.6604
3/4-20 UNEF	2A	0.7175	0.0013	0.0044	0.7162	0.7118
3/4-20 UNEF	3A	0.7175	none	0.0033	0.7175	0.7142
3/4-20 UNEF	2B	0.7175	none	0.0057	0.7232	0.7175
3/4-20 UNEF	3B	0.7175	none	0.0043	0.7218	0.7175
13/16-20 UNEF	2A	0.78	0.0013	0.0044	0.7787	0.7743
13/16-20 UNEF	3A	0.78	none	0.0033	0.78	0.7767
13/16-20 UNEF	2B	0.78	none	0.0058	0.7858	0.78
13/16-20 UNEF	3B	0.78	none	0.0043	0.7843	0.78
7/8-20 UNEF	2A	0.8425	0.0013	0.0045	0.8412	0.8367
7/8-20 UNEF	3A	0.8425	none	0.0034	0.8425	0.8391
7/8-20 UNEF	2B	0.8425	none	0.0058	0.8483	0.8425
7/8-20 UNEF	3B	0.8425	none	0.0044	0.8469	0.8425
15/16-20 UNEF	2A	0.905	0.0014	0.0045	0.9036	0.8991
15/16-20 UNEF	3A	0.905	none	0.0034	0.905	0.9016
15/16-20 UNEF	2B	0.905	none	0.0059	0.9109	0.905
15/16-20 UNEF	3B	0.905	none	0.0044	0.9094	0.905
1-20 UNEF	2A	0.9675	0.0014	0.0045	0.9661	0.9616
1-20 UNEF	3A	0.9675	none	0.0034	0.9675	0.9641
1-20 UNEF	2B	0.9675	none	0.0059	0.9734	0.9675
1-20 UNEF	3B	0.9675	none	0.0044	0.9719	0.9675
1-1/16-18 UNEF	2A	1.0264	0.0014	0.0048	1.025	1.0202
1-1/16-18 UNEF	3A	1.0264	none	0.0036	1.0264	1.0228
1-1/16-18 UNEF	2B	1.0264	none	0.0062	1.0326	1.0264
1-1/16-18 UNEF	3B	1.0264	none	0.0047	1.0311	1.0264
1-1/8-18 UNEF	2A	1.0889	0.0014	0.0048	1.0875	1.0827
1-1/8-18 UNEF	3A	1.0889	none	0.0036	1.0889	1.0853
1-1/8-18 UNEF	2B	1.0889	none	0.0062	1.0951	1.0889
1-1/8-18 UNEF	3B	1.0889	none	0.0047	1.0936	1.0889
1-3/16-18 UNEF	2A	1.1514	0.0014	0.0048	1.15	1.1452
1-3/16-18 UNEF	3A	1.1514	none	0.0036	1.1514	1.1478
1-3/16-18 UNEF	2B	1.1514	none	0.0063	1.1577	1.1514
1-3/16-18 UNEF	3B	1.1514	none	0.0047	1.1561	1.1514
1-1/4-18 UNEF	2A	1.2139	0.0015	0.0049	1.2124	1.2075
1-1/4-18 UNEF	3A	1.2139	none	0.0036	1.2139	1.2103
1-1/4-18 UNEF	2B	1.2139	none	0.0063	1.2202	1.2139
1-1/4-18 UNEF	3B	1.2139	none	0.0047	1.2186	1.2139
1-5/16-18 UNEF	2A	1.2764	0.0015	0.0049	1.2749	1.27
1-5/16-18 UNEF	3A	1.2764	none	0.0037	1.2764	1.2727
1-5/16-18 UNEF	2B	1.2764	none	0.0064	1.2828	1.2764
1-5/16-18 UNEF	3B	1.2764	none	0.0048	1.2812	1.2764
1-3/8-18 UNEF	2A	1.3389	0.0015	0.0049	1.3374	1.3325
1-3/8-18 UNEF	3A	1.3389	none	0.0037	1.3389	1.3352
1-3/8-18 UNEF	2B	1.3389	none	0.0064	1.3453	1.3389
1-3/8-18 UNEF	3B	1.3389	none	0.0048	1.3437	1.3389
1-7/16-18 UNEF	2A	1.4014	0.0015	0.0049	1.3999	1.395
1-7/16-18 UNEF	3A	1.4014	none	0.0037	1.4014	1.3977
1-7/16-18 UNEF	2B	1.4014	none	0.0064	1.4078	1.4014
1-7/16-18 UNEF	3B	1.4014	none	0.0048	1.4062	1.4014
1-1/2-18 UNEF	2A	1.4639	0.0015	0.005	1.4624	1.4574
1-1/2-18 UNEF	3A	1.4639	none	0.0037	1.4639	1.4602
1-1/2-18 UNEF	2B	1.4639	none	0.0065	1.4704	1.4639
1-1/2-18 UNEF	3B	1.4639	none	0.0048	1.4687	1.4639
1-9/16-18 UNEF	2A	1.5264	0.0015	0.005	1.5249	1.5199
1-9/16-18 UNEF	3A	1.5264	none	0.0037	1.5264	1.5227
1-9/16-18 UNEF	2B	1.5264	none	0.0065	1.5329	1.5264
1-9/16-18 UNEF	3B	1.5264	none	0.0049	1.5313	1.5264
1-5/8-18 UNEF	2A	1.5889	0.0015	0.005	1.5874	1.5824
1-5/8-18 UNEF	3A	1.5889	none	0.0038	1.5889	1.5851
1-5/8-18 UNEF	2B	1.5889	none	0.0065	1.5954	1.5889
1-5/8-18 UNEF	3B	1.5889	none	0.0049	1.5938	1.5889
1-11/16-18 UNEF	2A	1.6514	0.0015	0.005	1.6499	1.6449
1-11/16-18 UNEF	3A	1.6514	none	0.0038	1.6514	1.6476
1-11/16-18 UNEF	2B	1.6514	none	0.0065	1.6579	1.6514
1-11/16-18 UNEF	3B	1.6514	none	0.0049	1.6563	1.6514

Open the tool · the same data as JSON

Unified inch screw thread pitch diameter limits. ASME B1.1, Federal Screw Thread Specification H28. CC-BY-4.0, attribute to ctrlPlanner.

This is one characteristic. A real part has forty of them through five operations, and every one needs the same walk when the drawing revises. That is what ctrlPlanner does from a ballooned print.

Open the demo · a print is already loaded, no sign up.

Is there a pitch diameter table for UNC, UNF and UNEF threads?

The table

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