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
— 5.4576 5.4515 — 5.4594 5.4548 — 5.6828 5.6755 — 5.6938 5.6870 — 5.6959 5.6908 — 5.7017 5.6952 — 5.7075 5.7013 — 5.7094 5.7048 — 5.9328 5.9254 — 5.9516 5.9451 — 5.9438 5.9369 — 5.9459 5.9407 — 5.9575 5.9513 — 5.9594 5.9547
5.446
5 1 ∕ 2 -16 UN
2A 0.0018 5.4982 5.4888 3A 0.0000 5.5000 5.4906 2A 0.0022 5.7478 5.7349 2A 0.0021 5.7479 5.7365 3A 0.0000 5.7500 5.7386 2A 0.0019 5.7481 5.7378 2A 0.0019 5.7481 5.7387 3A 0.0000 5.7500 5.7406 2A 0.0022 5.9978 5.9849 2A 0.0020 5.9980 5.9877 2A 0.0021 5.9979 5.9865 3A 0.0000 6.0000 5.9886 2A 0.0019 5.9981 5.9887 3A 0.0000 6.0000 5.9906
5.4238 5.4256 5.6287 5.6487 5.6508 5.6630 5.6737 5.6756 5.8787 5.9129 5.8987 5.9008 5.9237 5.9256
2B 5.432
5.4594 5.4674 5.4594 5.4654 5.6850 5.6945 5.6959 5.7048 5.6959 5.7026 5.7036 5.7120 5.7094 5.7174 5.7094 5.7154 5.9350 5.9446 5.9536 5.9621 5.9459 5.9549 5.9459 5.9526 5.9594 5.9675 5.9594 5.9655
5.5000 5.5000 5.7500 5.7500 5.7500 5.7500 5.7500 5.7500 6.0000 6.0000 6.0000 6.0000 6.0000 6.0000
3B 5.4320 5.4409
5.663 5.678 5.688 5.696 5.913 5.938 5.928
5 3 ∕ 4 -10 UNS 5 3 ∕ 4 -12 UN 5 3 ∕ 4 -14 UNS 5 3 ∕ 4 -16 UN
2B 5.642 2B 5.660 2B 5.673 2B 5.682 2B 5.892 2B 5.923 2B 5.910
3B 5.6600 5.6698
3B 5.6820 5.6909
6-10 UNS 6-14 UNS 6-12 UN
3B 5.9100 5.9198
6-16 UN
5.946
2B 5.932
3B 5.9320 5.9409
a Use UNR designation instead of UN wherever UNR thread form is desired for external use. b Regarding combinations of thread classes, see text on page 1988. c UN series external thread maximum minor diameter is basic for Class 3A and basic minus allowance for Classes 1A and 2A. d For Class 2A threads having an additive finish the maximum is increased, by the allowance, to the basic size, the value being the same as for Class 3A. e For unfinished hot-rolled material not including standard fasteners with rolled threads. f Formerly NF, tolerances and allowances are based on one diameter length of engagement. All dimensions in inches. Use UNS threads only if Standard Series do not meet requirements (see pages 1948, 1980, and 1991). For additional sizes above 4 inches see ANSI/ASME B1.1- 2003 (R2018).
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