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 />
2–4 1 ⁄ 2 UNC 1A 0.0029 1.9971 1.9641 — 1.8528 1.8385 1.7324 1B 1.759 1.795 1.8557 1.8743 2.0000<br />
2A 0.0029 1.9971 1.9751 1.9641 1.8528 1.8433 1.7324 2B 1.759 1.795 1.8557 1.8681 2.0000<br />
3A 0.0000 2.0000 1.9780 — 1.8557 1.8486 1.7353 3B 1.7590 1.7861 1.8557 1.8650 2.0000<br />
2–6 UN 2A 0.0026 1.9974 1.9792 — 1.8891 1.8805 1.7990 2B 1.820 1.850 1.8917 1.9028 2.0000<br />
3A 0.0000 2.0000 1.9818 — 1.8917 1.8853 1.8016 3B 1.8200 1.8396 1.8917 1.9000 2.0000<br />
2–8 UN 2A 0.0023 1.9977 1.9827 1.9752 1.9165 1.9087 1.8489 2B 1.865 1.890 1.9188 1.9289 2.0000<br />
3A 0.0000 2.0000 1.9850 — 1.9188 1.9130 1.8512 3B 1.8650 1.8797 1.9188 1.9264 2.0000<br />
2–10 UNS 2A 0.0020 1.9980 1.9851 — 1.9330 1.9265 1.8790 2B 1.892 1.913 1.9350 1.9435 2.0000<br />
2–12 UN 2A 0.0018 1.9982 1.9868 — 1.9441 1.9380 1.8990 2B 1.910 1.928 1.9459 1.9538 2.0000<br />
3A 0.0000 2.0000 1.9886 — 1.9459 1.9414 1.9008 3B 1.9100 1.9198 1.9459 1.9518 2.0000<br />
2–14 UNS 2A 0.0017 1.9983 1.9880 — 1.9519 1.9462 1.9133 2B 1.923 1.938 1.9536 1.9610 2.0000<br />
2–16 UN 2A 0.0016 1.9984 1.9890 — 1.9578 1.9524 1.9239 2B 1.932 1.946 1.9594 1.9664 2.0000<br />
3A 0.0000 2.0000 1.9906 — 1.9594 1.9554 1.9255 3B 1.9320 1.9408 1.9594 1.9646 2.0000<br />
2–18 UNS 2A 0.0015 1.9985 1.9898 — 1.9624 1.9573 1.9324 2B 1.940 1.953 1.9639 1.9706 2.0000<br />
2–20 UN 2A 0.0015 1.9985 1.9904 — 1.9660 1.9611 1.9390 2B 1.946 1.957 1.9675 1.9739 2.0000<br />
3A 0.0000 2.0000 1.9919 — 1.9675 1.9638 1.9405 3B 1.9460 1.9537 1.9675 1.9723 2.0000<br />
2 1 ⁄ 16 –16 UNS 2A 0.0016 2.0609 2.0515 — 2.0203 2.0149 1.9864 2B 1.995 2.009 2.0219 2.0289 2.0625<br />
3A 0.0000 2.0625 2.0531 — 2.0219 2.0179 1.9880 3B 1.9950 2.0033 2.0219 2.0271 2.0625<br />
2 1 ⁄ 8 –6 UN 2A 0.0026 2.1224 2.1042 — 2.0141 2.0054 1.9240 2B 1.945 1.975 2.0167 2.0280 2.1250<br />
3A 0.0000 2.1250 2.1068 — 2.0167 2.0102 1.9266 3B 1.9450 1.9646 2.0167 2.0251 2.1250<br />
2 1 ⁄ 8 –8 UN 2A 0.0024 2.1226 2.1076 2.1001 2.0414 2.0335 1.9738 2B 1.990 2.015 2.0438 2.0540 2.1250<br />
3A 0.0000 2.1250 2.1100 — 2.0438 2.0379 1.9762 3B 1.9900 2.0047 2.0438 2.0515 2.1250<br />
2 1 ⁄ 8–12 UN 2A 0.0018 2.1232 2.1118 — 2.0691 2.0630 2.0240 2B 2.035 2.053 2.0709 2.0788 2.1250<br />
3A 0.0000 2.1250 2.1136 — 2.0709 2.0664 2.0258 3B 2.0350 2.0448 2.0709 2.0768 2.1250<br />
2 1 ⁄ 8 –16 UN 2A 0.0016 2.1234 2.1140 — 2.0828 2.0774 2.0489 2B 2.057 2.071 2.0844 2.0914 2.1250<br />
3A 0.0000 2.1250 2.1156 — 2.0844 2.0803 2.0505 3B 2.0570 2.0658 2.0844 2.0896 2.1250<br />
2 1 ⁄ 8 –20 UN 2A 0.0015 2.1235 2.1154 — 2.0910 2.0861 2.0640 2B 2.071 2.082 2.0925 2.0989 2.1250<br />
3A 0.0000 2.1250 2.1169 — 2.0925 2.0888 2.0655 3B 2.0710 2.0787 2.0925 2.0973 2.1250<br />
Copyright 2004, Industrial Press, Inc., New York, NY<br />
UNIFIED SCREW THREADS 1753
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