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 2 3 ∕ 16 -16 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 2.1875 2.1875 2.2500 2.2500 2.2500 2.2500 2.2500 2.2500 2.2500 2.2500 2.2500 2.2500 2.2500 2.2500 2.2500 2.2500 2.2500 2.2500 2.3125 2.3125 2.3750 2.3750 2.3750 2.3750 2.3750 2.3750 2.3750 2.3750
Class
2A 0.0016 2.1859 2.1765 3A 0.0000 2.1875 2.1781 1A 0.0029 2.2471 2.2141 3A 0.0000 2.2500 2.2280 2A 0.0026 2.2474 2.2292 3A 0.0000 2.2500 2.2318 3A 0.0000 2.2500 2.2350 2A 0.0020 2.2480 2.2351 2A 0.0018 2.2482 2.2368 3A 0.0000 2.2500 2.2386 2A 0.0017 2.2483 2.2380 2A 0.0016 2.2484 2.2390 3A 0.0000 2.2500 2.2406 2A 0.0016 2.2484 2.2397 2A 0.0015 2.2485 2.2404 3A 0.0000 2.2500 2.2419 2A 0.0016 2.3109 2.3015 3A 0.0000 2.3125 2.3031 2A 0.0027 2.3723 2.3541 3A 0.0000 2.3750 2.3568 2A 0.0024 2.3726 2.3576 3A 0.0000 2.3750 2.3600 2A 0.0018 2.3732 2.3618 3A 0.0000 2.3750 2.3636 2A 0.0016 2.3734 2.3640 3A 0.0000 2.3750 2.3656
— 2.1453 2.1399 — 2.1469 2.1428 — 2.1028 2.0882 — 2.1057 2.0984 — 2.1391 2.1303 — 2.1417 2.1351 — 2.1688 2.1628 — 2.1830 2.1764 — 2.1941 2.1880 — 2.1959 2.1913 — 2.2019 2.1961 — 2.2078 2.2023 — 2.2094 2.2053 — 2.2123 2.2071 — 2.2160 2.2110 — 2.2175 2.2137 — 2.2703 2.2648 — 2.2719 2.2678 — 2.2640 2.2551 — 2.2667 2.2601 — 2.2914 2.2833 — 2.2938 2.2878 — 2.3191 2.3129 — 2.3209 2.3163 — 2.3328 2.3273 — 2.3344 2.3303
2.1115 2.1131 1.9825 1.9825 1.9854 2.0489 2.0515 2.0988 2.1012 2.1289 2.1490 2.1508 2.1632 2.1740 2.1756 2.1822 2.1890 2.1905 2.2365 2.2381 2.1738 2.1765 2.2238 2.2262 2.2740 2.2758 2.2990 2.3006
2B 2.120
2.134
2.1469 2.1540 2.1469 2.1522 2.1057 2.1247 2.1057 2.1183 2.1057 2.1152 2.1417 2.1531 2.1417 2.1502 2.1688 2.1792 2.1688 2.1766 2.1850 2.1936 2.1959 2.2039 2.1959 2.2019 2.2036 2.2111 2.2094 2.2165 2.2094 2.2147 2.2139 2.2207 2.2175 2.2240 2.2175 2.2223 2.2719 2.2790 2.2719 2.2772 2.2667 2.2782 2.2667 2.2753 2.2938 2.3043 2.2938 2.3017 2.3209 2.3289 2.3209 2.3269 2.3344 2.3415 2.3344 2.3398
3B 2.1200 2.1284
1B 2.009 2B 2.009
2.045 2.045
2 1 ∕ 4 -4 1 ∕ 2 UNC
2A 0.0029 2.2471 2.2251 2.2141 2.1028 2.0931
3B 2.0090 2.0361
2B 2.070
2.100
2 1 ∕ 4 -6 UN
3B 2.0700 2.0896
2A 0.0024 2.2476 2.2326 2.2251 2.1664 2.1584
2B 2.115
2.140
2 1 ∕ 4 -8 UN
3B 2.1150 2.1297
2B 2.142 2B 2.160 2B 2.173 2B 2.182 2B 2.190 2B 2.196
2.163 2.178 2.188 2.196 2.203 2.207
2 1 ∕ 4 -10 UNS 2 1 ∕ 4 -12 UN 2 1 ∕ 4 -14 UNS 2 1 ∕ 4 -16 UN 2 1 ∕ 4 -18 UNS 2 1 ∕ 4 -20 UN
3B 2.1600 2.1698
3B 2.1820 2.1909
3B 2.1960 2.2036
2B 2.245
2.259
2 5 ∕ 16 -16 UNS
3B 2.2450 2.2534
2B 2.195
2.225
2 3 ∕ 8 -6 UN
3B 2.1950 2.2146
2B 2.240
2.265
2 3 ∕ 8 -8 UN
3B 2.2400 2.2547
2B 2.285
2.303
2 3 ∕ 8 -12 UN
3B 2.2850 2.2948
2B 2.307
2.321
2 3 ∕ 8 -16 UN
3B 2.3070 2.3159
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