Threads and Threading - Sportpilot.info
Threads and Threading - Sportpilot.info
Threads and Threading - Sportpilot.info
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Nominal Size,<br />
<strong>Threads</strong> per Inch,<br />
<strong>and</strong> Series<br />
Designation a<br />
Class<br />
Table 3. (Continued) St<strong>and</strong>ard Series <strong>and</strong> Selected Combinations — Unified Screw <strong>Threads</strong><br />
Allowance<br />
Machinery's H<strong>and</strong>book 27th Edition<br />
Externalb Internalb Major Diameter Pitch Diameter<br />
UNR Minor<br />
Dia., c Max<br />
Minor Diameter Pitch Diameter<br />
Major<br />
Diameter<br />
Max (Ref.) Class<br />
d Min Mine Maxd Min Min Max Min Max Min<br />
111 ⁄ 16 –16 UN 2A 0.0016 1.6859 1.6765 — 1.6453 1.6400 1.6114 2B 1.620 1.634 1.6469 1.6538 1.6875<br />
3A 0.0000 1.6875 1.6781 — 1.6469 1.6429 1.6130 3B 1.6200 1.6283 1.6469 1.6521 1.6875<br />
111 ⁄ 16 –18 UNEF 2A 0.0015 1.6860 1.6773 — 1.6499 1.6448 1.6199 2B 1.627 1.640 1.6514 1.6580 1.6875<br />
3A 0.0000 1.6875 1.6788 — 1.6514 1.6476 1.6214 3B 1.6270 1.6355 1.6514 1.6563 1.6875<br />
111 ⁄ 16 –20 UN 2A 0.0015 1.6860 1.6779 — 1.6535 1.6487 1.6265 2B 1.633 1.645 1.6550 1.6613 1.6875<br />
3A 0.0000 1.6875 1.6794 — 1.6550 1.6514 1.6280 3B 1.6330 1.6412 1.6550 1.6597 1.6875<br />
13 ⁄ 4–5 UNC 1A 0.0027 1.7473 1.7165 — 1.6174 1.6040 1.5092 1B 1.534 1.568 1.6201 1.6375 1.7500<br />
2A 0.0027 1.7473 1.7268 1.7165 1.6174 1.6085 1.5092 2B 1.534 1.568 1.6201 1.6317 1.7500<br />
3A 0.0000 1.7500 1.7295 — 1.6201 1.6134 1.5119 3B 1.5340 1.5575 1.6201 1.6288 1.7500<br />
13 ⁄ 4–6 UN 2A 0.0025 1.7475 1.7293 — 1.6392 1.6309 1.5491 2B 1.570 1.600 1.6417 1.6525 1.7500<br />
3A 0.0000 1.7500 1.7318 — 1.6417 1.6354 1.5516 3B 1.5700 1.5896 1.6417 1.6498 1.7500<br />
13 ⁄ 4 –8 UN 2A 0.0023 1.7477 1.7327 1.7252 1.6665 1.6590 1.5989 2B 1.615 1.640 1.6688 1.6786 1.7500<br />
3A 0.0000 1.7500 1.7350 — 1.6688 1.6632 1.6012 3B 1.6150 1.6297 1.6688 1.6762 1.7500<br />
13 ⁄ 4 –10 UNS 2A 0.0019 1.7481 1.7352 — 1.6831 1.6766 1.6291 2B 1.642 1.663 1.6850 1.6934 1.7500<br />
13 ⁄ 4 –12 UN 2A 0.0018 1.7482 1.7368 — 1.6941 1.6881 1.6490 2B 1.660 1.678 1.6959 1.7037 1.7500<br />
3A 0.0000 1.7500 1.7386 — 1.6959 1.6914 1.6508 3B 1.6600 1.6698 1.6959 1.7017 1.7500<br />
13 ⁄ 4 –14 UNS 2A 0.0017 1.7483 1.7380 — 1.7019 1.6963 1.6632 2B 1.673 1.688 1.7036 1.7109 1.7500<br />
13 ⁄ 4 –16 UN 2A 0.0016 1.7484 1.7390 — 1.7078 1.7025 1.6739 2B 1.682 1.696 1.7094 1.7163 1.7500<br />
3A 0.0000 1.7500 1.7406 — 1.7094 1.7054 1.6755 3B 1.6820 1.6908 1.7094 1.7146 1.7500<br />
13 ⁄ 4–18 UNS 2A 0.0015 1.7485 1.7398 — 1.7124 1.7073 1.6824 2B 1.690 1.703 1.7139 1.7205 1.7500<br />
13 ⁄ 4 –20 UN 2A 0.0015 1.7485 1.7404 — 1.7160 1.7112 1.6890 2B 1.696 1.707 1.7175 1.7238 1.7500<br />
3A 0.0000 1.7500 1.7419 — 1.7175 1.7139 1.6905 3B 1.6960 1.7037 1.7175 1.7222 1.7500<br />
113 ⁄ 16 –6 UN 2A 0.0025 1.8100 1.7918 — 1.7017 1.6933 1.6116 2B 1.632 1.663 1.7042 1.7151 1.8125<br />
3A 0.0000 1.8125 1.7943 — 1.7042 1.6979 1.6141 3B 1.6320 1.6521 1.7042 1.7124 1.8125<br />
113 ⁄ 16 –8 UN 2A 0.0023 1.8102 1.7952 — 1.7290 1.7214 1.6614 2B 1.677 1.702 1.7313 1.7412 1.8125<br />
3A 0.0000 1.8125 1.7975 — 1.7313 1.7256 1.6637 3B 1.6770 1.6922 1.7313 1.7387 1.8125<br />
113 ⁄ 16 –12 UN 2A 0.0018 1.8107 1.7993 — 1.7566 1.7506 1.7115 2B 1.722 1.740 1.7584 1.7662 1.8125<br />
3A 0.0000 1.8125 1.8011 — 1.7584 1.7539 1.7133 3B 1.7220 1.7323 1.7584 1.7642 1.8125<br />
Copyright 2004, Industrial Press, Inc., New York, NY<br />
UNIFIED SCREW THREADS 1751
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