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 1 ∕ 8 -14 UNS
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 1.1250 1.1250 1.1250 1.1250 1.1250 1.1250 1.1250 1.1250 1.1250 1.1250 1.1875 1.1875 1.1875 1.1875 1.1875 1.1875 1.1875 1.1875 1.1875 1.1875 1.1875 1.1875 1.2500 1.2500 1.2500 1.2500 1.2500 1.2500
Class
2A 0.0016 1.1234 1.1131 2A 0.0015 1.1235 1.1141 3A 0.0000 1.1250 1.1156 2A 0.0014 1.1236 1.1149 3A 0.0000 1.1250 1.1163 2A 0.0014 1.1236 1.1155 3A 0.0000 1.1250 1.1169 2A 0.0013 1.1237 1.1165 2A 0.0012 1.1238 1.1173 3A 0.0000 1.1250 1.1185 2A 0.0021 1.1854 1.1704 3A 0.0000 1.1875 1.1725 2A 0.0017 1.1858 1.1744 3A 0.0000 1.1875 1.1761 2A 0.0015 1.1860 1.1766 3A 0.0000 1.1875 1.1781 2A 0.0014 1.1861 1.1774 3A 0.0000 1.1875 1.1788 2A 0.0014 1.1861 1.1780 3A 0.0000 1.1875 1.1794 2A 0.0012 1.1863 1.1798 3A 0.0000 1.1875 1.1810 1A 0.0022 1.2478 1.2232
— 1.0770 1.0717 — 1.0829 1.0779 — 1.0844 1.0806 — 1.0875 1.0827 — 1.0889 1.0853 — 1.0911 1.0865 — 1.0925 1.0890 — 1.0966 1.0923 — 1.1006 1.0966 — 1.1018 1.0988 — 1.1042 1.0972 — 1.1063 1.1011 — 1.1317 1.1260 — 1.1334 1.1291 — 1.1454 1.1403 — 1.1469 1.1431 — 1.1500 1.1452 — 1.1514 1.1478 — 1.1536 1.1490 — 1.1550 1.1515 — 1.1631 1.1590 — 1.1643 1.1613 — 1.1550 1.1439
1.0383 1.0491 1.0506 1.0574 1.0588 1.0641 1.0655 1.0741 1.0813 1.0825 1.0366 1.0387 1.0866 1.0883 1.1116 1.1131 1.1199 1.1213 1.1266 1.1280 1.1438 1.1450 1.0777 1.0777 1.0799 1.0991 1.1012 1.1290
2B 1.048 2B 1.057
1.063 1.071
1.0786 1.0855 1.0844 1.0910 1.0844 1.0893 1.0889 1.0951 1.0889 1.0936 1.0925 1.0985 1.0925 1.0970 1.0979 1.1035 1.1018 1.1070 1.1018 1.1057 1.1063 1.1154 1.1063 1.1131 1.1334 1.1409 1.1334 1.1390 1.1469 1.1535 1.1469 1.1518 1.1514 1.1577 1.1514 1.1561 1.1550 1.1610 1.1550 1.1595 1.1643 1.1696 1.1643 1.1683 1.1572 1.1716 1.1572 1.1668 1.1572 1.1644 1.1688 1.1780 1.1688 1.1757 1.1850 1.1932
1 1 ∕ 8 -16 UN
3B 1.0570 1.0659
2B 1.065
1.078
1 1 ∕ 8 -18 UNEF
3B 1.0650 1.0730
2B 1.071
1.082
1 1 ∕ 8 -20 UN
3B 1.0710 1.0786
2B 1.080 2B 1.086
1.090 1.095
1 1 ∕ 8 -24 UNS 1 1 ∕ 8 -28 UN
3B 1.0860 1.0926
2B 1.052
1.077
1 3 ∕ 16 -8 UN
3B 1.0520 1.0672
2B 1.097
1.115
1 3 ∕ 16 -12 UN
3B 1.0970 1.1073
2B 1.120
1.134
1 3 ∕ 16 -16 UN
3B 1.1200 1.1284
2B 1.127
1.140
1 3 ∕ 16 -18 UNEF
3B 1.1270 1.1355
2B 1.133
1.145
1 3 ∕ 16 -20 UN
3B 1.1330 1.1411
2B 1.149
1.157
1 3 ∕ 16 -28 UN
3B 1.1490 1.1551
1B 1.095 2B 1.095
1.123 1.123
1 1 ∕ 4 -7 UNC
2A 0.0022 1.2478 1.2314 1.2232 1.1550 1.1476
3A 0.0000 1.2500 1.2336
— 1.1572 1.1517
3B 1.0950 1.1125
2A 0.0021 1.2479 1.2329 1.2254 1.1667 1.1597
2B 1.115
1.140
1 1 ∕ 4 -8 UN
3A 0.0000 1.2500 1.2350 2A 0.0019 1.2481 1.2352
— 1.1688 1.1635 — 1.1831 1.1768
3B 1.1150 1.1297
2B 1.142
1.163
1 1 ∕ 4 -10 UNS
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