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Machinery's Handbook 27th Edition Table 3. (Continued) Standard Series and Selected Combinations — Unified Screw Threads Nominal Size, Threads per Inch, and Series Designation 1 ⁄2 –12 UNS 2A 0.0016 0.4984 0.4870 — 0.4443 0.4389 0.3992 2B 0.410 0.428 0.4459 0.4529 0.5000 a Externalb Internalb Allow- Major Diameter Pitch Diameter UNR Minor Dia., Class ance c Max Minor Diameter Pitch Diameter Major Diameter Max (Ref.) Class d Min Mine Maxd Min Min Max Min Max Min 3A 0.0000 0.5000 0.4886 — 0.4459 0.4419 0.4008 3B 0.4100 0.4223 0.4459 0.4511 0.5000 1 ⁄2 –13 UNC 1A 0.0015 0.4985 0.4822 — 0.4485 0.4411 0.4069 1B 0.417 0.434 0.4500 0.4597 0.5000 2A 0.0015 0.4985 0.4876 0.4822 0.4485 0.4435 0.4069 2B 0.417 0.434 0.4500 0.4565 0.5000 3A 0.0000 0.5000 0.4891 — 0.4500 0.4463 0.4084 3B 0.4170 0.4284 0.4500 0.4548 0.5000 1 ⁄2 –14 UNS 2A 0.0015 0.4985 0.4882 — 0.4521 0.4471 0.4135 2B 0.423 0.438 0.4536 0.4601 0.5000 1 ⁄2–16 UN 2A 0.0014 0.4986 0.4892 — 0.4580 0.4533 0.4241 2B 0.432 0.446 0.4594 0.4655 0.5000 3A 0.0000 0.5000 0.4906 — 0.4594 0.4559 0.4255 3B 0.4320 0.4419 0.4594 0.4640 0.5000 1 ⁄2 –18 UNS 2A 0.0013 0.4987 0.4900 — 0.4626 0.4582 0.4326 2B 0.440 0.453 0.4639 0.4697 0.5000 1 ⁄2 –20 UNF 1A 0.0013 0.4987 0.4865 — 0.4662 0.4598 0.4392 1B 0.446 0.457 0.4675 0.4759 0.5000 2A 0.0013 0.4987 0.4906 — 0.4662 0.4619 0.4392 2B 0.446 0.457 0.4675 0.4731 0.5000 3A 0.0000 0.5000 0.4919 — 0.4675 0.4643 0.4405 3B 0.4460 0.4537 0.4675 0.4717 0.5000 1 ⁄2 –24 UNS 2A 0.0012 0.4988 0.4916 — 0.4717 0.4678 0.4492 2B 0.455 0.465 0.4729 0.4780 0.5000 1 ⁄2 –27 UNS 2A 0.0011 0.4989 0.4922 — 0.4748 0.4711 0.4548 2B 0.460 0.469 0.4759 0.4807 0.5000 1 ⁄2 –28 UNEF 2A 0.0011 0.4989 0.4924 — 0.4757 0.4720 0.4563 2B 0.461 0.470 0.4768 0.4816 0.5000 3A 0.0000 0.5000 0.4935 — 0.4768 0.4740 0.4574 3B 0.4610 0.4676 0.4768 0.4804 0.5000 1 ⁄2 –32 UN 2A 0.0010 0.4990 0.4930 — 0.4787 0.4752 0.4618 2B 0.466 0.474 0.4797 0.4842 0.5000 3A 0.0000 0.5000 0.4940 — 0.4797 0.4771 0.4628 3B 0.4660 0.4719 0.4797 0.4831 0.5000 9 ⁄16–12 UNC 1A 0.0016 0.5609 0.5437 — 0.5068 0.4990 0.4617 1B 0.472 0.490 0.5084 0.5186 0.5625 2A 0.0016 0.5609 0.5495 0.5437 0.5068 0.5016 0.4617 2B 0.472 0.490 0.5084 0.5152 0.5625 3A 0.0000 0.5625 0.5511 — 0.5084 0.5045 0.4633 3B 0.4720 0.4843 0.5084 0.5135 0.5625 9 ⁄16 –14 UNS 2A 0.0015 0.5610 0.5507 — 0.5146 0.5096 0.4760 2B 0.485 0.501 0.5161 0.5226 0.5625 9 ⁄16 –16 UN 2A 0.0014 0.5611 0.5517 — 0.5205 0.5158 0.4866 2B 0.495 0.509 0.5219 0.5280 0.5625 3A 0.0000 0.5625 0.5531 — 0.5219 0.5184 0.4880 3B 0.4950 0.5040 0.5219 0.5265 0.5625 9 ⁄16 –18 UNF 1A 0.0014 0.5611 0.5480 — 0.5250 0.5182 0.4950 1B 0.502 0.515 0.5264 0.5353 0.5625 2A 0.0014 0.5611 0.5524 — 0.5250 0.5205 0.4950 2B 0.502 0.515 0.5264 0.5323 0.5625 3A 0.0000 0.5625 0.5538 — 0.5264 0.5230 0.4964 3B 0.5020 0.5106 0.5264 0.5308 0.5625 Copyright 2004, Industrial Press, Inc., New York, NY 1740 UNIFIED SCREW THREADS
Machinery's Handbook 27th Edition Table 3. (Continued) Standard Series and Selected Combinations — Unified Screw Threads Nominal Size, Threads per Inch, and Series Designation 9 ⁄16 –20 UN 2A 0.0013 0.5612 0.5531 — 0.5287 0.5245 0.5017 2B 0.508 0.520 0.5300 0.5355 0.5625 a Externalb Internalb Allow- Major Diameter Pitch Diameter UNR Minor Dia., Class ance c Max Minor Diameter Pitch Diameter Major Diameter Max (Ref.) Class d Min Mine Maxd Min Min Max Min Max Min 3A 0.0000 0.5625 0.5544 — 0.5300 0.5268 0.5030 3B 0.5080 0.5162 0.5300 0.5341 0.5625 9 ⁄16 –24 UNEF 2A 0.0012 0.5613 0.5541 — 0.5342 0.5303 0.5117 2B 0.517 0.527 0.5354 0.5405 0.5625 3A 0.0000 0.5625 0.5553 — 0.5354 0.5325 0.5129 3B 0.5170 0.5244 0.5354 0.5392 0.5625 9 ⁄16 –27 UNS 2A 0.0011 0.5614 0.5547 — 0.5373 0.5336 0.5173 2B 0.522 0.531 0.5384 0.5432 0.5625 9 ⁄16–28 UN 2A 0.0011 0.5614 0.5549 — 0.5382 0.5345 0.5188 2B 0.524 0.532 0.5393 0.5441 0.5625 3A 0.0000 0.5625 0.5560 — 0.5393 0.5365 0.5199 3B 0.5240 0.5301 0.5393 0.5429 0.5625 9 ⁄16 –32 UN 2A 0.0010 0.5615 0.5555 — 0.5412 0.5377 0.5243 2B 0.529 0.536 0.5422 0.5467 0.5625 3A 0.0000 0.5625 0.5565 — 0.5422 0.5396 0.5253 3B 0.5290 0.5344 0.5422 0.5456 0.5625 5 ⁄8 –11 UNC 1A 0.0016 0.6234 0.6052 — 0.5644 0.5561 0.5152 1B 0.527 0.546 0.5660 0.5767 0.6250 2A 0.0016 0.6234 0.6113 0.6052 0.5644 0.5589 0.5152 2B 0.527 0.546 0.5660 0.5732 0.6250 3A 0.0000 0.6250 0.6129 — 0.5660 0.5619 0.5168 3B 0.5270 0.5391 0.5660 0.5714 0.6250 5 ⁄8 –12 UN 2A 0.0016 0.6234 0.6120 — 0.5693 0.5639 0.5242 2B 0.535 0.553 0.5709 0.5780 0.6250 3A 0.0000 0.6250 0.6136 — 0.5709 0.5668 0.5258 3B 0.5350 0.5463 0.5709 0.5762 0.6250 5 ⁄8 –14 UNS 2A 0.0015 0.6235 0.6132 — 0.5771 0.5720 0.5385 2B 0.548 0.564 0.5786 0.5852 0.6250 5 ⁄8 –16 UN 2A 0.0014 0.6236 0.6142 — 0.5830 0.5782 0.5491 2B 0.557 0.571 0.5844 0.5906 0.6250 3A 0.0000 0.6250 0.6156 — 0.5844 0.5808 0.5505 3B 0.5570 0.5662 0.5844 0.5890 0.6250 5 ⁄8 –18 UNF 1A 0.0014 0.6236 0.6105 — 0.5875 0.5805 0.5575 1B 0.565 0.578 0.5889 0.5980 0.6250 2A 0.0014 0.6236 0.6149 — 0.5875 0.5828 0.5575 2B 0.565 0.578 0.5889 0.5949 0.6250 3A 0.0000 0.6250 0.6163 — 0.5889 0.5854 0.5589 3B 0.5650 0.5730 0.5889 0.5934 0.6250 5 ⁄8–20 UN 2A 0.0013 0.6237 0.6156 — 0.5912 0.5869 0.5642 2B 0.571 0.582 0.5925 0.5981 0.6250 3A 0.0000 0.6250 0.6169 — 0.5925 0.5893 0.5655 3B 0.5710 0.5787 0.5925 0.5967 0.6250 5 ⁄8 –24 UNEF 2A 0.0012 0.6238 0.6166 — 0.5967 0.5927 0.5742 2B 0.580 0.590 0.5979 0.6031 0.6250 3A 0.0000 0.6250 0.6178 — 0.5979 0.5949 0.5754 3B 0.5800 0.5869 0.5979 0.6018 0.6250 5 ⁄8 –27 UNS 2A 0.0011 0.6239 0.6172 — 0.5998 0.5960 0.5798 2B 0.585 0.594 0.6009 0.6059 0.6250 5 ⁄8 –28 UN 2A 0.0011 0.6239 0.6174 — 0.6007 0.5969 0.5813 2B 0.586 0.595 0.6018 0.6067 0.6250 3A 0.0000 0.6250 0.6185 — 0.6018 0.5990 0.5824 3B 0.5860 0.5926 0.6018 0.6055 0.6250 Copyright 2004, Industrial Press, Inc., New York, NY UNIFIED SCREW THREADS 1741
Page 1 and 2: SCREW THREAD SYSTEMS 1725 Screw Thr
Page 3 and 4: Machinery's Handbook 27th Edition O
Page 5 and 6: Machinery's Handbook 27th Edition T
Page 7 and 8: SCREW THREADS 1727 ISO Metric Threa
Page 9 and 10: Machinery's Handbook 27th Edition S
Page 11 and 12: Machinery's Handbook 27th Edition S
Page 13 and 14: UNIFIED SCREW THREADS 1733 UN Inter
Page 15 and 16: Machinery's Handbook 27th Edition U
Page 17 and 18: Nominal Size, Threads per Inch, and
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Page 45 and 46: UNIFIED SCREW THREADS 1765 Table 4c
Page 49 and 50: UNIFIED SCREW THREADS 1769 Table 5d
Page 51 and 52: UNIFIED SCREW THREADS 1771 Table 5e
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Page 59 and 60: MINIATURE SCREW THREADS 1779 Table
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METRIC SCREW THREADS M PROFILE 1791
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Machinery's Handbook 27th Edition M
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Pitch P METRIC SCREW THREADS M PROF
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Machinery's Handbook 27th Edition M
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Basic Thread METRIC SCREW THREADS M
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METRIC SCREW THREADS MJ PROFILE 180
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TRAPEZOIDAL METRIC THREADS 1807 Tol
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TRAPEZOIDAL METRIC THREADS 1809 Tab
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120 140 160 180 110 130 150 170 Mac
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Machinery's Handbook 27th Edition T
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Pitch P BRITISH STANDARD ISO METRIC
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BRITISH STANDARD ISO METRIC SCREW T
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Nominal Diametera BRITISH STANDARD
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Nominal Diameter BRITISH STANDARD I
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Table 2b. Limiting Dimensions of AN
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CENTRALIZING ACME SCREW THREADS 183
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Machinery's Handbook 27th Edition C
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Table 8c. Limiting Dimensions of Am
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Machinery's Handbook 27th Edition S
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Table 14b. Limiting Dimensions for
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Nominal Sizes Table 15. Stub Acme S
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Machinery's Handbook 27th Edition B
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Thds. a per Inch ANSI BUTTRESS THRE
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ANSI BUTTRESS THREADS 1853 Table 3.
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ANSI BUTTRESS THREADS 1855 The majo
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WHITWORTH THREADS 1859 Table 3. Bri
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AMERICAN PIPE THREADS 1861 Table 1a
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AMERICAN PIPE THREADS 1863 guide fo
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DRYSEAL PIPE THREADS 1867 b PTF-SAE
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HOSE COUPLING SCREW THREADS 1875 Th
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