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
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
Class
— 4.4439 4.4373 — 4.4459 4.4409 — 4.4517 4.4454 — 4.4576 4.4516 — 4.4594 4.4549 — 4.6828 4.6756 — 4.6939 4.6872 — 4.6959 4.6909 — 4.7017 4.6954 — 4.7076 4.7016 — 4.7094 4.7049 — 4.9328 4.9256 — 4.9439 4.9372 — 4.9459 4.9409 — 4.9517 4.9454 — 4.9576 4.9515 — 4.9594 4.9549 — 5.1828 5.1755 — 5.1939 5.1871 — 5.1959 5.1908 — 5.2017 5.1953 — 5.2076 5.2015 — 5.2094 5.2048 — 5.4328 5.4255 — 5.4439 5.4371 — 5.4459 5.4408 — 5.4517 5.4453
4.428
4 1 ∕ 2 -12 UN
2A 0.0020 4.4980 4.4866 3A 0.0000 4.5000 4.4886 2A 0.0019 4.4981 4.4878 2A 0.0018 4.4982 4.4888 3A 0.0000 4.5000 4.4906 2A 0.0022 4.7478 4.7349 2A 0.0020 4.7480 4.7366 3A 0.0000 4.7500 4.7386 2A 0.0019 4.7481 4.7378 2A 0.0018 4.7482 4.7388 3A 0.0000 4.7500 4.7406 2A 0.0022 4.9978 4.9849 2A 0.0020 4.9980 4.9866 3A 0.0000 5.0000 4.9886 2A 0.0019 4.9981 4.9878 2A 0.0018 4.9982 4.9888 3A 0.0000 5.0000 4.9906 2A 0.0022 5.2478 5.2349 2A 0.0020 5.2480 5.2366 3A 0.0000 5.2500 5.2386 2A 0.0019 5.2481 5.2378 2A 0.0018 5.2482 5.2388 3A 0.0000 5.2500 5.2406 2A 0.0022 5.4978 5.4849 2A 0.0020 5.4980 5.4866 3A 0.0000 5.5000 5.4886 2A 0.0019 5.4981 5.4878
4.3988 4.4008 4.4130 4.4238 4.4256 4.6287 4.6488 4.6508 4.6630 4.6738 4.6756 4.8787 4.8988 4.9008 4.9130 4.9238 4.9256 5.1287 5.1488 5.1508 5.1630 5.1738 5.1756 5.3787 5.3988 5.4008 5.4130
2B 4.410
4.4459 4.4545 4.4459 4.4524 4.4536 4.4617 4.4594 4.4672 4.4594 4.4652 4.6850 4.6943 4.6959 4.7046 4.6959 4.7024 4.7036 4.7118 4.7094 4.7172 4.7094 4.7153 4.9350 4.9444 4.9459 4.9546 4.9459 4.9525 4.9536 4.9619 4.9594 4.9673 4.9594 4.9653 5.1850 5.1944 5.1959 5.2047 5.1959 5.2025 5.2036 5.2119 5.2094 5.2173 5.2094 5.2153 5.4350 5.4445 5.4459 5.4548 5.4459 5.4525 5.4536 5.4620
4.5000 4.5000 4.5000 4.5000 4.5000 4.7500 4.7500 4.7500 4.7500 4.7500 4.7500 5.0000 5.0000 5.0000 5.0000 5.0000 5.0000 5.2500 5.2500 5.2500 5.2500 5.2500 5.2500 5.5000 5.5000 5.5000 5.5000
3B 4.4100 4.4198
4.438 4.446 4.663 4.678 4.688 4.696 4.913 4.928 4.938 4.946 5.163 5.178 5.188 5.196 5.413 5.428
4 1 ∕ 2 -14 UNS 4 1 ∕ 2 -16 UN 4 3 ∕ 4 -10 UNS 4 3 ∕ 4 -12 UN 4 3 ∕ 4 -14 UNS 4 3 ∕ 4 -16 UN 5.00-10 UNS 5.00-12 UN 5.00-14 UNS 5.00-16 UN 5 1 ∕ 4 -10 UNS 5 1 ∕ 4 -12 UN 5 1 ∕ 4 -14 UNS 5 1 ∕ 4 -16 UN 5 1 ∕ 2 -10 UNS 5 1 ∕ 2 -12 UN
2B 4.423 2B 4.432 2B 4.642 2B 4.660 2B 4.673 2B 4.682 2B 4.892 2B 4.910 2B 4.923 2B 4.932 2B 5.142 2B 5.160 2B 5.173 2B 5.182 2B 5.392 2B 5.410
3B 4.4320 4.4409
3B 4.6600 4.6698
3B 4.6820 4.6909
3B 4.9100 4.9198
3B 4.9320 4.9409
3B 5.1600 5.1698
3B 5.1820 5.1909
3B 5.4100 5.4198
5.438
5 1 ∕ 2 -14 UNS
2B 5.423
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