Threads and Threading - Sportpilot.info
Threads and Threading - Sportpilot.info
Threads and Threading - Sportpilot.info
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Machinery's H<strong>and</strong>book 27th Edition<br />
Table 3. (Continued) St<strong>and</strong>ard Series <strong>and</strong> Selected Combinations — Unified Screw <strong>Threads</strong><br />
11 Nominal Size,<br />
<strong>Threads</strong> per Inch,<br />
<strong>and</strong> Series<br />
Designation<br />
⁄ 8 –14 UNS 2A 0.0016 1.1234 1.1131 — 1.0770 1.0717 1.0384 2B 1.048 1.064 1.0786 1.0855 1.1250<br />
a<br />
Externalb Internalb Allow-<br />
Major Diameter Pitch Diameter<br />
UNR Minor<br />
Dia.,<br />
Class ance<br />
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 />
1 1 ⁄ 8 –16 UN 2A 0.0015 1.1235 1.1141 — 1.0829 1.0779 1.0490 2B 1.057 1.071 1.0844 1.0909 1.1250<br />
3A 0.0000 1.1250 1.1156 — 1.0844 1.0807 1.0505 3B 1.0570 1.0658 1.0844 1.0893 1.1250<br />
1 1 ⁄ 8 –18 UNEF 2A 0.0014 1.1236 1.1149 — 1.0875 1.0828 1.0575 2B 1.065 1.078 1.0889 1.0951 1.1250<br />
3A 0.0000 1.1250 1.1163 — 1.0889 1.0853 1.0589 3B 1.0650 1.0730 1.0889 1.0935 1.1250<br />
1 1 ⁄ 8–20 UN 2A 0.0014 1.1236 1.1155 — 1.0911 1.0866 1.0641 2B 1.071 1.082 1.0925 1.0984 1.1250<br />
3A 0.0000 1.1250 1.1169 — 1.0925 1.0891 1.0655 3B 1.0710 1.0787 1.0925 1.0969 1.1250<br />
1 1 ⁄ 8 –24 UNS 2A 0.0013 1.1237 1.1165 — 1.0966 1.0924 1.0742 2B 1.080 1.090 1.0979 1.1034 1.1250<br />
1 1 ⁄ 8 –28 UN 2A 0.0012 1.1238 1.1173 — 1.1006 1.0966 1.0812 2B 1.086 1.095 1.1018 1.1070 1.1250<br />
3A 0.0000 1.1250 1.1185 — 1.1018 1.0988 1.0824 3B 1.0860 1.0926 1.1018 1.1057 1.1250<br />
1 3 ⁄ 16 –8 UN 2A 0.0021 1.1854 1.1704 — 1.1042 1.0972 1.0366 2B 1.052 1.077 1.1063 1.1154 1.1875<br />
3A 0.0000 1.1875 1.1725 — 1.1063 1.1011 1.0387 3B 1.0520 1.0672 1.1063 1.1131 1.1875<br />
1 3 ⁄ 16 –12 UN 2A 0.0017 1.1858 1.1744 — 1.1317 1.1259 1.0866 2B 1.097 1.115 1.1334 1.1409 1.1875<br />
3A 0.0000 1.1875 1.1761 — 1.1334 1.1291 1.0883 3B 1.0970 1.1073 1.1334 1.1390 1.1875<br />
1 3 ⁄ 16 –16 UN 2A 0.0015 1.1860 1.1766 — 1.1454 1.1403 1.1115 2B 1.120 1.134 1.1469 1.1535 1.1875<br />
3A 0.0000 1.1875 1.1781 — 1.1469 1.1431 1.1130 3B 1.1200 1.1283 1.1469 1.1519 1.1875<br />
1 3 ⁄ 16 –18 UNEF 2A 0.0015 1.1860 1.1773 — 1.1499 1.1450 1.1199 2B 1.127 1.140 1.1514 1.1577 1.1875<br />
3A 0.0000 1.1875 1.1788 — 1.1514 1.1478 1.1214 3B 1.1270 1.1355 1.1514 1.1561 1.1875<br />
1 3 ⁄ 16–20 UN 2A 0.0014 1.1861 1.1780 — 1.1536 1.1489 1.1266 2B 1.133 1.145 1.1550 1.1611 1.1875<br />
3A 0.0000 1.1875 1.1794 — 1.1550 1.1515 1.1280 3B 1.1330 1.1412 1.1550 1.1595 1.1875<br />
1 3 ⁄ 16 –28 UN 2A 0.0012 1.1863 1.1798 — 1.1631 1.1590 1.1437 2B 1.149 1.157 1.1643 1.1696 1.1875<br />
3A 0.0000 1.1875 1.1810 — 1.1643 1.1612 1.1449 3B 1.1490 1.1551 1.1643 1.1683 1.1875<br />
1 1 ⁄ 4 –7 UNC 1A 0.0022 1.2478 1.2232 — 1.1550 1.1439 1.0777 1B 1.095 1.123 1.1572 1.1716 1.2500<br />
2A 0.0022 1.2478 1.2314 1.2232 1.1550 1.1476 1.0777 2B 1.095 1.123 1.1572 1.1668 1.2500<br />
3A 0.0000 1.2500 1.2336 — 1.1572 1.1517 1.0799 3B 1.0950 1.1125 1.1572 1.1644 1.2500<br />
1 1 ⁄ 4 –8 UN 2A 0.0021 1.2479 1.2329 1.2254 1.1667 1.1597 1.0991 2B 1.115 1.140 1.1688 1.1780 1.2500<br />
3A 0.0000 1.2500 1.2350 — 1.1688 1.1635 1.1012 3B 1.1150 1.1297 1.1688 1.1757 1.2500<br />
1 1 ⁄ 4 –10 UNS 2A 0.0019 1.2481 1.2352 — 1.1831 1.1768 1.1291 2B 1.142 1.163 1.1850 1.1932 1.2500<br />
Copyright 2004, Industrial Press, Inc., New York, NY<br />
1746<br />
UNIFIED SCREW THREADS
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