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 13 ∕ 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 1.8125 1.8125 1.8125 1.8125 1.8750 1.8750 1.8750 1.8750 1.8750 1.8750 1.8750 1.8750 1.8750 1.8750 1.8750 1.8750 1.8750 1.9375 1.9375 1.9375 1.9375 1.9375 1.9375 1.9375 1.9375 1.9375 1.9375
Class
2A 0.0016 1.8109 1.8015 3A 0.0000 1.8125 1.8031 2A 0.0015 1.8110 1.8029 3A 0.0000 1.8125 1.8044 2A 0.0025 1.8725 1.8543 3A 0.0000 1.8750 1.8568 3A 0.0000 1.8750 1.8600 2A 0.0020 1.8730 1.8601 2A 0.0018 1.8732 1.8618 3A 0.0000 1.8750 1.8636 2A 0.0017 1.8733 1.8630 2A 0.0016 1.8734 1.8640 3A 0.0000 1.8750 1.8656 2A 0.0015 1.8735 1.8648 2A 0.0015 1.8735 1.8654 3A 0.0000 1.8750 1.8669 2A 0.0026 1.9349 1.9167 3A 0.0000 1.9375 1.9193 2A 0.0023 1.9352 1.9202 3A 0.0000 1.9375 1.9225 2A 0.0018 1.9357 1.9243 3A 0.0000 1.9375 1.9261 2A 0.0016 1.9359 1.9265 3A 0.0000 1.9375 1.9281 2A 0.0015 1.9360 1.9279 3A 0.0000 1.9375 1.9294
— 1.7703 1.7650 — 1.7719 1.7679 — 1.7785 1.7736 — 1.7800 1.7763 — 1.7642 1.7558 — 1.7667 1.7604 — 1.7938 1.7881 — 1.8080 1.8015 — 1.8191 1.8131 — 1.8209 1.8164 — 1.8269 1.8213 — 1.8328 1.8275 — 1.8344 1.8304 — 1.8374 1.8323 — 1.8410 1.8361 — 1.8425 1.8388 — 1.8266 1.8181 — 1.8292 1.8228 — 1.8540 1.8463 — 1.8563 1.8505 — 1.8816 1.8756 — 1.8834 1.8789 — 1.8953 1.8899 — 1.8969 1.8929 — 1.9035 1.8986 — 1.9050 1.9013
1.7365 1.7381 1.7515 1.7530 1.6740 1.6765 1.7239 1.7262 1.7539 1.7740 1.7758 1.7882 1.7990 1.8006 1.8073 1.8140 1.8155 1.7364 1.7390 1.7864 1.7887 1.8365 1.8383 1.8615 1.8631 1.8765 1.8780
2B 1.745
1.759
1.7719 1.7788 1.7719 1.7771 1.7800 1.7863 1.7800 1.7847 1.7667 1.7777 1.7667 1.7749 1.7938 1.8038 1.7938 1.8013 1.8100 1.8185 1.8209 1.8287 1.8209 1.8268 1.8286 1.8359 1.8344 1.8413 1.8344 1.8396 1.8389 1.8455 1.8425 1.8489 1.8425 1.8473 1.8292 1.8403 1.8292 1.8375 1.8563 1.8663 1.8563 1.8638 1.8834 1.8912 1.8834 1.8893 1.8969 1.9039 1.8969 1.9021 1.9050 1.9114 1.9050 1.9098
3B 1.7450 1.7534
2B 1.758
1.770
1 13 ∕ 16 -20 UN
3B 1.7580 1.7661
2B 1.695
1.725
1 7 ∕ 8 -6 UN
3B 1.6950 1.7146
2A 0.0023 1.8727 1.8577 1.8502 1.7915 1.7838
2B 1.740
1.765
1 7 ∕ 8 -8 UN
3B 1.7400 1.7547
2B 1.767 2B 1.785 2B 1.798 2B 1.807 2B 1.815 2B 1.821
1.788 1.803 1.813 1.821 1.828 1.832
1 7 ∕ 8 -10 UNS 1 7 ∕ 8 -12 UN 1 7 ∕ 8 -14 UNS 1 7 ∕ 8 -16 UN 1 7 ∕ 8 -18 UNS 1 7 ∕ 8 -20 UN
3B 1.7850 1.7948
3B 1.8070 1.8159
3B 1.8210 1.8286
2B 1.757
1.788
1 15 ∕ 16 -6 UN
3B 1.7570 1.7771
2B 1.802
1.827
1 15 ∕ 16 -8 UN
3B 1.8020 1.8172
2B 1.847
1.865
1 15 ∕ 16 -12 UN
3B 1.8470 1.8573
2B 1.870
1.884
1 15 ∕ 16 -16 UN
3B 1.8700 1.8784
2B 1.883
1.895
1 15 ∕ 16 -20 UN
3B 1.8830 1.8911
Made with FlippingBook - Share PDF online