Table 3. Standard Series and Selected Combinations—Unified Screw Threads Table 3. (Continued) Standard Series and Selected Combinations—Unified Screw Threads
External b
Internal b
Nominal Size, Threads per Inch, and Series Designation a 1 7 ∕ 16 -28 UN
Major Diameter
UNR Minor Dia., c Max (Ref.)
Major Diameter
Pitch Diameter
Minor Diameter
Pitch Diameter
Allow ance
Max d
Min e
Max d
Class
Min
Min
Min
Max
Min
Max
Min 1.4375 1.4375 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5000 1.5625 1.5625 1.5625 1.5625 1.5625 1.5625
Class
2A 0.0013 1.4362 1.4297 3A 0.0000 1.4375 1.4310 1A 0.0024 1.4976 1.4703
— 1.4130 1.4088 — 1.4143 1.4112 — 1.3893 1.3772
1.3937 1.3950 1.2991 1.2991 1.3015 1.3490 1.3512 1.3790 1.3989 1.3989 1.4008 1.4132 1.4240 1.4256 1.4323 1.4338 1.4391 1.4405 1.4491 1.4562 1.4575 1.3616 1.3640 1.4115 1.4137 1.4615 1.4633
2B 1.399
1.407
1.4143 1.4197 1.4143 1.4184 1.3917 1.4075 1.3917 1.4022 1.3917 1.3996 1.4188 1.4283 1.4188 1.4259 1.4350 1.4433 1.4459 1.4584 1.4459 1.4542 1.4459 1.4522 1.4536 1.4608 1.4594 1.4662 1.4594 1.4645 1.4639 1.4704 1.4639 1.4687 1.4675 1.4737 1.4675 1.4721 1.4729 1.4787 1.4768 1.4823 1.4768 1.4809 1.4542 1.4648 1.4542 1.4622 1.4813 1.4909 1.4813 1.4885 1.5084 1.5161 1.5084 1.5142
3B 1.3990 1.4051
1B 1.320 2B 1.320
1.350 1.350
1 1 ∕ 2 -6 UNC
2A 0.0024 1.4976 1.4794 1.4703 1.3893 1.3812
3A 0.0000 1.5000 1.4818
— 1.3917 1.3856
3B 1.3200 1.3396
2A 0.0022 1.4978 1.4828 1.4753 1.4166 1.4093
2B 1.365
1.390
1 1 ∕ 2 -8 UN
3A 0.0000 1.5000 1.4850 2A 0.0019 1.4981 1.4852 1A 0.0019 1.4981 1.4809 2A 0.0019 1.4981 1.4867 3A 0.0000 1.5000 1.4886 2A 0.0017 1.4983 1.4880 2A 0.0016 1.4984 1.4890 3A 0.0000 1.5000 1.4906 2A 0.0015 1.4985 1.4898 3A 0.0000 1.5000 1.4913 2A 0.0014 1.4986 1.4905 3A 0.0000 1.5000 1.4919 2A 0.0013 1.4987 1.4915 2A 0.0013 1.4987 1.4922 3A 0.0000 1.5000 1.4935 2A 0.0024 1.5601 1.5419 3A 0.0000 1.5625 1.5443 2A 0.0022 1.5603 1.5453 3A 0.0000 1.5625 1.5475 2A 0.0018 1.5607 1.5493 3A 0.0000 1.5625 1.5511
— 1.4188 1.4133 — 1.4331 1.4267 — 1.4440 1.4344 — 1.4440 1.4376 — 1.4459 1.4411 — 1.4519 1.4464 — 1.4578 1.4526 — 1.4594 1.4555 — 1.4624 1.4574 — 1.4639 1.4602 — 1.4661 1.4613 — 1.4675 1.4639 — 1.4716 1.4672 — 1.4755 1.4713 — 1.4768 1.4737 — 1.4518 1.4436 — 1.4542 1.4481 — 1.4791 1.4717 — 1.4813 1.4758 — 1.5066 1.5007 — 1.5084 1.5040
3B 1.3650 1.3797
2B 1.392 1B 1.410 2B 1.410 2B 1.423 2B 1.432
1.413 1.428 1.428 1.438 1.446
1 1 ∕ 2 -10 UNS 1 1 ∕ 2 -12 UNF
3B 1.4100 1.4198
1 1 ∕ 2 -14 UNS 1 1 ∕ 2 -16 UN
3B 1.4320 1.4409
2B 1.440
1.453
1 1 ∕ 2 -18 UNEF
3B 1.4400 1.4480
2B 1.446
1.457
1 1 ∕ 2 -20 UN
3B 1.4460 1.4536
2B 1.455 2B 1.461
1.465 1.470
1 1 ∕ 2 -24 UNS 1 1 ∕ 2 -28 UN
3B 1.4610 1.4676
2B 1.382
1.413
1 9 ∕ 16 -6 UN
3B 1.3820 1.4021
2B 1.427
1.452
1 9 ∕ 16 -8 UN
3B 1.4270 1.4422
2B 1.472
1.490
1 9 ∕ 16 -12 UN
3B 1.4720 1.4823
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