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 11 ∕ 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 1.6875 1.6875 1.6875 1.6875 1.6875 1.6875 1.7500 1.7500 1.7500 1.7500 1.7500 1.7500 1.7500 1.7500 1.7500 1.7500 1.7500 1.7500 1.7500 1.7500 1.7500 1.7500 1.8125 1.8125 1.8125 1.8125 1.8125 1.8125
Class
2A 0.0016 1.6859 1.6765 3A 0.0000 1.6875 1.6781 2A 0.0015 1.6860 1.6773 3A 0.0000 1.6875 1.6788 2A 0.0014 1.6861 1.6780 3A 0.0000 1.6875 1.6794 1A 0.0027 1.7473 1.7165 3A 0.0000 1.7500 1.7295 2A 0.0025 1.7475 1.7293 3A 0.0000 1.7500 1.7318 3A 0.0000 1.7500 1.7350 2A 0.0019 1.7481 1.7352 2A 0.0018 1.7482 1.7368 3A 0.0000 1.7500 1.7386 2A 0.0017 1.7483 1.7380 2A 0.0016 1.7484 1.7390 3A 0.0000 1.7500 1.7406 2A 0.0015 1.7485 1.7398 2A 0.0015 1.7485 1.7404 3A 0.0000 1.7500 1.7419 2A 0.0025 1.8100 1.7918 3A 0.0000 1.8125 1.7943 2A 0.0023 1.8102 1.7952 3A 0.0000 1.8125 1.7975 2A 0.0018 1.8107 1.7993 3A 0.0000 1.8125 1.8011
— 1.6453 1.6400 — 1.6469 1.6429 — 1.6499 1.6449 — 1.6514 1.6476 — 1.6536 1.6488 — 1.6550 1.6514 — 1.6174 1.6040 — 1.6201 1.6134 — 1.6392 1.6309 — 1.6417 1.6354 — 1.6688 1.6631 — 1.6831 1.6766 — 1.6941 1.6881 — 1.6959 1.6914 — 1.7019 1.6963 — 1.7078 1.7025 — 1.7094 1.7054 — 1.7124 1.7073 — 1.7160 1.7112 — 1.7175 1.7139 — 1.7017 1.6933 — 1.7042 1.6979 — 1.7290 1.7214 — 1.7313 1.7256 — 1.7566 1.7506 — 1.7584 1.7539
1.6115 1.6131 1.6198 1.6213 1.6266 1.6280 1.5091 1.5091 1.5118 1.5490 1.5515 1.5989 1.6012 1.6290 1.6490 1.6508 1.6632 1.6740 1.6756 1.6823 1.6890 1.6905 1.6115 1.6140 1.6614 1.6637 1.7115 1.7133
2B 1.620
1.634
1.6469 1.6538 1.6469 1.6520 1.6514 1.6579 1.6514 1.6563 1.6550 1.6613 1.6550 1.6597 1.6201 1.6375 1.6201 1.6317 1.6201 1.6288 1.6417 1.6525 1.6417 1.6498 1.6688 1.6786 1.6688 1.6762 1.6850 1.6934 1.6959 1.7037 1.6959 1.7017 1.7036 1.7109 1.7094 1.7163 1.7094 1.7146 1.7139 1.7205 1.7175 1.7238 1.7175 1.7222 1.7042 1.7151 1.7042 1.7124 1.7313 1.7412 1.7313 1.7387 1.7584 1.7662 1.7584 1.7642
3B 1.6200 1.6284
2B 1.627
1.640
1 11 ∕ 16 -18 UNEF
3B 1.6270 1.6355
2B 1.633
1.645
1 11 ∕ 16 -20 UN
3B 1.6330 1.6411
1B 1.533 2B 1.533
1.567 1.567
1 3 ∕ 4 -5 UNC
2A 0.0027 1.7473 1.7268 1.7165 1.6174 1.6085
3B 1.5330 1.5575
2B 1.570
1.600
1 3 ∕ 4 -6 UN
3B 1.5700 1.5896
2A 0.0023 1.7477 1.7327 1.7252 1.6665 1.6590
2B 1.615
1.640
1 3 ∕ 4 -8 UN
3B 1.6150 1.6297
2B 1.642 2B 1.660 2B 1.673 2B 1.682 2B 1.690 2B 1.696
1.663 1.678 1.688 1.696 1.703 1.707
1 3 ∕ 4 -10 UNS 1 3 ∕ 4 -12 UN 1 3 ∕ 4 -14 UNS 1 3 ∕ 4 -16 UN 1 3 ∕ 4 -18 UNS 1 3 ∕ 4 -20 UN
3B 1.6600 1.6698
3B 1.6820 1.6909
3B 1.6960 1.7036
2B 1.632
1.663
1 13 ∕ 16 -6 UN
3B 1.6320 1.6521
2B 1.677
1.702
1 13 ∕ 16 -8 UN
3B 1.6770 1.6922
2B 1.722
1.740
1 13 ∕ 16 -12 UN
3B 1.7220 1.7323
Made with FlippingBook - Share PDF online