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 />
Table 3. (Continued) St<strong>and</strong>ard Series <strong>and</strong> Selected Combinations — Unified Screw <strong>Threads</strong><br />
Allow-<br />
Machinery's H<strong>and</strong>book 27th Edition<br />
External b Internal b<br />
Major Diameter Pitch Diameter<br />
UNR Minor<br />
Dia., c Max<br />
Minor Diameter Pitch Diameter<br />
Major<br />
Diameter<br />
3–4 UNC 1A 0.0032 2.9968 2.9611 — 2.8344 2.8183 2.6991 1B 2.729 2.767 2.8376 2.8585 3.0000<br />
2A 0.0032 2.9968 2.9730 2.9611 2.8344 2.8237 2.6991 2B 2.729 2.767 2.8376 2.8515 3.0000<br />
3A 0.0000 3.0000 2.9762 — 2.8376 2.8296 2.7023 3B 2.7290 2.7594 2.8376 2.8480 3.0000<br />
3–6 UN 2A 0.0028 2.9972 2.9790 — 2.8889 2.8796 2.7988 2B 2.820 2.850 2.8917 2.9038 3.0000<br />
3A 0.0000 3.0000 2.9818 — 2.8917 2.8847 2.8016 3B 2.8200 2.8396 2.8917 2.9008 3.0000<br />
3–8 UN 2A 0.0026 2.9974 2.9824 2.9749 2.9162 2.9077 2.8486 2B 2.865 2.890 2.9188 2.9299 3.0000<br />
3A 0.0000 3.0000 2.9850 — 2.9188 2.9124 2.8512 3B 2.8650 2.8797 2.9188 2.9271 3.0000<br />
3–10 UNS 2A 0.0020 2.9980 2.9851 — 2.9330 2.9262 2.8790 2B 2.892 2.913 2.9350 2.9439 3.0000<br />
3–12 UN 2A 0.0019 2.9981 2.9867 — 2.9440 2.9377 2.8989 2B 2.910 2.928 2.9459 2.9541 3.0000<br />
3A 0.0000 3.0000 2.9886 — 2.9459 2.9412 2.9008 3B 2.9100 2.9198 2.9459 2.9521 3.0000<br />
3–14 UNS 2A 0.0018 2.9982 2.9879 — 2.9518 2.9459 2.9132 2B 2.923 2.938 2.9536 2.9613 3.0000<br />
3–16 UN 2A 0.0017 2.9983 2.9889 — 2.9577 2.9521 2.9238 2B 2.932 2.946 2.9594 2.9667 3.0000<br />
3A 0.0000 3.0000 2.9906 — 2.9594 2.9552 2.9255 3B 2.9320 2.9408 2.9594 2.9649 3.0000<br />
3–18 UNS 2A 0.0016 2.9984 2.9897 — 2.9623 2.9569 2.9323 2B 2.940 2.953 2.9639 2.9709 3.0000<br />
3–20 UN 2A 0.0016 2.9984 2.9903 — 2.9659 2.9607 2.9389 2B 2.946 2.957 2.9675 2.9743 3.0000<br />
3A 0.0000 3.0000 2.9919 — 2.9675 2.9636 2.9405 3B 2.9460 2.9537 2.9675 2.9726 3.0000<br />
31 ⁄ 8 –6 UN 2A 0.0028 3.1222 3.1040 — 3.0139 3.0045 2.9238 2B 2.945 2.975 3.0167 3.0289 3.1250<br />
3A 0.0000 3.1250 3.1068 — 3.0167 3.0097 2.9266 3B 2.9450 2.9646 3.0167 3.0259 3.1250<br />
31 ⁄ 8 –8 UN 2A 0.0026 3.1224 3.1074 — 3.0412 3.0326 2.9736 2B 2.990 3.015 3.0438 3.0550 3.1250<br />
3A 0.0000 3.1250 3.1100 — 3.0438 3.0374 2.9762 3B 2.9900 3.0047 3.0438 3.0522 3.1250<br />
31 ⁄ 8 –12 UN 2A 0.0019 3.1231 3.1117 — 3.0690 3.0627 3.0239 2B 3.035 3.053 3.0709 3.0791 3.1250<br />
3A 0.0000 3.1250 3.1136 — 3.0709 3.0662 3.0258 3B 3.0350 3.0448 3.0709 3.0771 3.1250<br />
31 ⁄ 8 –16 UN 2A 0.0017 3.1233 3.1139 — 3.0827 3.0771 3.0488 2B 3.057 3.071 3.0844 3.0917 3.1250<br />
3A 0.0000 3.1250 3.1156 — 3.0844 3.0802 3.0505 3B 3.0570 3.0658 3.0844 3.0899 3.1250<br />
31 ⁄ 4–4 UNC 1A 0.0033 3.2467 3.2110 — 3.0843 3.0680 2.9490 1B 2.979 3.017 3.0876 3.1088 3.2500<br />
2A 0.0033 3.2467 3.2229 3.2110 3.0843 3.0734 2.9490 2B 2.979 3.017 3.0876 3.1017 3.2500<br />
3A 0.0000 3.2500 3.2262 — 3.0876 3.0794 2.9523 3B 2.9790 3.0094 3.0876 3.0982 3.2500<br />
31 Designation<br />
⁄ 4 –6 UN 2A 0.0028 3.2472 3.2290 — 3.1389 3.1294 3.0488 2B 3.070 3.100 3.1417 3.1540 3.2500<br />
3A 0.0000 3.2500 3.2318 — 3.1417 3.1346 3.0516 3B 3.0700 3.0896 3.1417 3.1509 3.2500<br />
a Class ance Max (Ref.) Class<br />
d Min Mine Maxd Min Min Max Min Max Min<br />
Copyright 2004, Industrial Press, Inc., New York, NY<br />
UNIFIED SCREW THREADS 1757
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