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 9 ∕ 16 -16 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 1.5625 1.5625 1.5625 1.5625 1.5625 1.5625 1.6250 1.6250 1.6250 1.6250 1.6250 1.6250 1.6250 1.6250 1.6250 1.6250 1.6250 1.6250 1.6250 1.6250 1.6250 1.6875 1.6875 1.6875 1.6875 1.6875 1.6875
Class
2A 0.0016 1.5609 1.5515 3A 0.0000 1.5625 1.5531 2A 0.0015 1.5610 1.5523 3A 0.0000 1.5625 1.5538 2A 0.0014 1.5611 1.5530 3A 0.0000 1.5625 1.5544 2A 0.0025 1.6225 1.6043 3A 0.0000 1.6250 1.6068 3A 0.0000 1.6250 1.6100 2A 0.0019 1.6231 1.6102 2A 0.0018 1.6232 1.6118 3A 0.0000 1.6250 1.6136 2A 0.0017 1.6233 1.6130 2A 0.0016 1.6234 1.6140 3A 0.0000 1.6250 1.6156 2A 0.0015 1.6235 1.6148 3A 0.0000 1.6250 1.6163 2A 0.0014 1.6236 1.6155 3A 0.0000 1.6250 1.6169 2A 0.0013 1.6237 1.6165 2A 0.0025 1.6850 1.6668 3A 0.0000 1.6875 1.6693 2A 0.0022 1.6853 1.6703 3A 0.0000 1.6875 1.6725 2A 0.0018 1.6857 1.6743 3A 0.0000 1.6875 1.6761
— 1.5203 1.5151 — 1.5219 1.5180 — 1.5249 1.5199 — 1.5264 1.5227 — 1.5286 1.5238 — 1.5300 1.5264 — 1.5142 1.5060 — 1.5167 1.5105 — 1.5438 1.5382 — 1.5581 1.5517 — 1.5691 1.5632 — 1.5709 1.5665 — 1.5769 1.5714 — 1.5828 1.5775 — 1.5844 1.5805 — 1.5874 1.5824 — 1.5889 1.5851 — 1.5911 1.5863 — 1.5925 1.5889 — 1.5966 1.5921 — 1.5767 1.5684 — 1.5792 1.5730 — 1.6041 1.5966 — 1.6063 1.6007 — 1.6316 1.6257 — 1.6334 1.6289
1.4865 1.4881 1.4948 1.4963 1.5016 1.5030 1.4240 1.4265 1.4740 1.4762 1.5040 1.5240 1.5258 1.5382 1.5490 1.5506 1.5573 1.5588 1.5641 1.5655 1.5741 1.4865 1.4890 1.5365 1.5387 1.5865 1.5883
2B 1.495
1.509
1.5219 1.5287 1.5219 1.5270 1.5264 1.5329 1.5264 1.5313 1.5300 1.5362 1.5300 1.5347 1.5167 1.5274 1.5167 1.5247 1.5438 1.5535 1.5438 1.5510 1.5600 1.5683 1.5709 1.5786 1.5709 1.5767 1.5786 1.5858 1.5844 1.5912 1.5844 1.5895 1.5889 1.5954 1.5889 1.5938 1.5925 1.5987 1.5925 1.5972 1.5979 1.6037 1.5792 1.5900 1.5792 1.5873 1.6063 1.6160 1.6063 1.6136 1.6334 1.6411 1.6334 1.6392
3B 1.4950 1.5034
2B 1.502
1.515
1 9 ∕ 16 -18 UNEF
3B 1.5020 1.5105
2B 1.508
1.520
1 9 ∕ 16 -20 UN
3B 1.5080 1.5161
2B 1.445
1.475
1 5 ∕ 8 -6 UN
3B 1.4450 1.4646
2A 0.0022 1.6228 1.6078 1.6003 1.5416 1.5342
2B 1.490
1.515
1 5 ∕ 8 -8 UN
3B 1.4900 1.5047
2B 1.517 2B 1.535 2B 1.548 2B 1.557
1.538 1.553 1.563 1.571
1 5 ∕ 8 -10 UNS 1 5 ∕ 8 -12 UN 1 5 ∕ 8 -14 UNS 1 5 ∕ 8 -16 UN
3B 1.5350 1.5448
3B 1.5570 1.5659
2B 1.565
1.578
1 5 ∕ 8 -18 UNEF
3B 1.5650 1.5730
2B 1.571
1.582
1 5 ∕ 8 -20 UN
3B 1.5710 1.5786
2B 1.580 2B 1.507
1.590 1.538
1 5 ∕ 8 -24 UNS 1 11 ∕ 16 -6 UN
3B 1.5070 1.5271
2B 1.552
1.577
1 11 ∕ 16 -8 UN
3B 1.5520 1.5672
2B 1.597
1.615
1 11 ∕ 16 -12 UN
3B 1.5970 1.6073
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