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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 7 ⁄8 –24 UNS 2A 0.0012 0.8738 0.8666 — 0.8467 0.8426 0.8242 2B 0.830 0.840 0.8479 0.8532 0.8750 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 7 ⁄8 –27 UNS 2A 0.0012 0.8738 0.8671 — 0.8497 0.8458 0.8297 2B 0.835 0.844 0.8509 0.8560 0.8750 7 ⁄8 –28 UN 2A 0.0012 0.8738 0.8673 — 0.8506 0.8468 0.8312 2B 0.836 0.845 0.8518 0.8568 0.8750 3A 0.0000 0.8750 0.8685 — 0.8518 0.8489 0.8324 3B 0.8360 0.8426 0.8518 0.8555 0.8750 7 ⁄8–32 UN 2A 0.0011 0.8739 0.8679 — 0.8536 0.8500 0.8367 2B 0.841 0.849 0.8547 0.8594 0.8750 3A 0.0000 0.8750 0.8690 — 0.8547 0.8520 0.8378 3B 0.8410 0.8469 0.8547 0.8583 0.8750 15 ⁄16 –12 UN 2A 0.0017 0.9358 0.9244 — 0.8817 0.8760 0.8366 2B 0.847 0.865 0.8834 0.8908 0.9375 3A 0.0000 0.9375 0.9261 — 0.8834 0.8793 0.8383 3B 0.8470 0.8575 0.8834 0.8889 0.9375 15 ⁄16 –16 UN 2A 0.0015 0.9360 0.9266 — 0.8954 0.8904 0.8615 2B 0.870 0.884 0.8969 0.9034 0.9375 3A 0.0000 0.9375 0.9281 — 0.8969 0.8932 0.8630 3B 0.8700 0.8783 0.8969 0.9018 0.9375 15 ⁄16 –20 UNEF 2A 0.0014 0.9361 0.9280 — 0.9036 0.8991 0.8766 2B 0.883 0.895 0.9050 0.9109 0.9375 3A 0.0000 0.9375 0.9294 — 0.9050 0.9016 0.8780 3B 0.8830 0.8912 0.9050 0.9094 0.9375 15 ⁄16 –28 UN 2A 0.0012 0.9363 0.9298 — 0.9131 0.9091 0.8937 2B 0.899 0.907 0.9143 0.9195 0.9375 3A 0.0000 0.9375 0.9310 — 0.9143 0.9113 0.8949 3B 0.8990 0.9051 0.9143 0.9182 0.9375 15 ⁄16 –32 UN 2A 0.0011 0.9364 0.9304 — 0.9161 0.9123 0.8992 2B 0.904 0.911 0.9172 0.9221 0.9375 3A 0.0000 0.9375 0.9315 — 0.9172 0.9144 0.9003 3B 0.9040 0.9094 0.9172 0.9209 0.9375 1–8 UNC 1A 0.0020 0.9980 0.9755 — 0.9168 0.9067 0.8492 1B 0.865 0.890 0.9188 0.9320 1.0000 2A 0.0020 0.9980 0.9830 0.9755 0.9168 0.9100 0.8492 2B 0.865 0.890 0.9188 0.9276 1.0000 3A 0.0000 1.0000 0.9850 — 0.9188 0.9137 0.8512 3B 0.8650 0.8797 0.9188 0.9254 1.0000 1–10 UNS 2A 0.0018 0.9982 0.9853 — 0.9332 0.9270 0.8792 2B 0.892 0.913 0.9350 0.9430 1.0000 1–12 UNF 1A 0.0018 0.9982 0.9810 — 0.9441 0.9353 0.8990 1B 0.910 0.928 0.9459 0.9573 1.0000 2A 0.0018 0.9982 0.9868 — 0.9441 0.9382 0.8990 2B 0.910 0.928 0.9459 0.9535 1.0000 3A 0.0000 1.0000 0.9886 — 0.9459 0.9415 0.9008 3B 0.9100 0.9198 0.9459 0.9516 1.0000 1–14 UNS f 1A 0.0017 0.9983 0.9828 — 0.9519 0.9435 0.9132 1B 0.923 0.938 0.9536 0.9645 1.0000 2A 0.0017 0.9983 0.9880 — 0.9519 0.9463 0.9132 2B 0.923 0.938 0.9536 0.9609 1.0000 3A 0.0000 1.0000 0.9897 — 0.9536 0.9494 0.9149 3B 0.9230 0.9315 0.9536 0.9590 1.0000 1–16 UN 2A 0.0015 0.9985 0.9891 — 0.9579 0.9529 0.9240 2B 0.932 0.946 0.9594 0.9659 1.0000 3A 0.0000 1.0000 0.9906 — 0.9594 0.9557 0.9255 3B 0.9320 0.9408 0.9594 0.9643 1.0000 1–18 UNS 2A 0.0014 0.9986 0.9899 — 0.9625 0.9578 0.9325 2B 0.940 0.953 0.9639 0.9701 1.0000 Copyright 2004, Industrial Press, Inc., New York, NY 1744 UNIFIED SCREW THREADS
Nominal Size, Threads per Inch, and Series Table 3. (Continued) Standard Series and Selected Combinations — Unified Screw Threads Allow- Machinery's Handbook 27th Edition Externalb Internalb Major Diameter Pitch Diameter UNR Minor Dia., c Max Minor Diameter Pitch Diameter Major Diameter 1–20 UNEF 2A 0.0014 0.9986 0.9905 — 0.9661 0.9616 0.9391 2B 0.946 0.957 0.9675 0.9734 1.0000 3A 0.0000 1.0000 0.9919 — 0.9675 0.9641 0.9405 3B 0.9460 0.9537 0.9675 0.9719 1.0000 1–24 UNS 2A 0.0013 0.9987 0.9915 — 0.9716 0.9674 0.9491 2B 0.955 0.965 0.9729 0.9784 1.0000 1–27 UNS 2A 0.0012 0.9988 0.9921 — 0.9747 0.9707 0.9547 2B 0.960 0.969 0.9759 0.9811 1.0000 1–28 UN 2A 0.0012 0.9988 0.9923 — 0.9756 0.9716 0.9562 2B 0.961 0.970 0.9768 0.9820 1.0000 3A 0.0000 1.0000 0.9935 — 0.9768 0.9738 0.9574 3B 0.9610 0.9676 0.9768 0.9807 1.0000 1–32 UN 2A 0.0011 0.9989 0.9929 — 0.9786 0.9748 0.9617 2B 0.966 0.974 0.9797 0.9846 1.0000 3A 0.0000 1.0000 0.9940 — 0.9797 0.9769 0.9628 3B 0.9660 0.9719 0.9797 0.9834 1.0000 11 ⁄ 16 –8 UN 2A 0.0020 1.0605 1.0455 — 0.9793 0.9725 0.9117 2B 0.927 0.952 0.9813 0.9902 1.0625 3A 0.0000 1.0625 1.0475 — 0.9813 0.9762 0.9137 3B 0.9270 0.9422 0.9813 0.9880 1.0625 11 ⁄ 16 –12 UN 2A 0.0017 1.0608 1.0494 — 1.0067 1.0010 0.9616 2B 0.972 0.990 1.0084 1.0158 1.0625 3A 0.0000 1.0625 1.0511 — 1.0084 1.0042 0.9633 3B 0.9720 0.9823 1.0084 1.0139 1.0625 11 ⁄ 16 –16 UN 2A 0.0015 1.0610 1.0516 — 1.0204 1.0154 0.9865 2B 0.995 1.009 1.0219 1.0284 1.0625 3A 0.0000 1.0625 1.0531 — 1.0219 1.0182 0.9880 3B 0.9950 1.0033 1.0219 1.0268 1.0625 11 ⁄ 16 –18 UNEF 2A 0.0014 1.0611 1.0524 — 1.0250 1.0203 0.9950 2B 1.002 1.015 1.0264 1.0326 1.0625 3A 0.0000 1.0625 1.0538 — 1.0264 1.0228 0.9964 3B 1.0020 1.0105 1.0264 1.0310 1.0625 11 ⁄ 16–20 UN 2A 0.0014 1.0611 1.0530 — 1.0286 1.0241 1.0016 2B 1.008 1.020 1.0300 1.0359 1.0625 3A 0.0000 1.0625 1.0544 — 1.0300 1.0266 1.0030 3B 1.0080 1.0162 1.0300 1.0344 1.0625 11 ⁄ 16 –28 UN 2A 0.0012 1.0613 1.0548 — 1.0381 1.0341 1.0187 2B 1.024 1.032 1.0393 1.0445 1.0625 3A 0.0000 1.0625 1.0560 — 1.0393 1.0363 1.0199 3B 1.0240 1.0301 1.0393 1.0432 1.0625 11 ⁄ 8 –7 UNC 1A 0.0022 1.1228 1.0982 — 1.0300 1.0191 0.9527 1B 0.970 0.998 1.0322 1.0463 1.1250 2A 0.0022 1.1228 1.1064 1.0982 1.0300 1.0228 0.9527 2B 0.970 0.998 1.0322 1.0416 1.1250 3A 0.0000 1.1250 1.1086 — 1.0322 1.0268 0.9549 3B 0.9700 0.9875 1.0322 1.0393 1.1250 11 ⁄ 8 –8 UN 2A 0.0021 1.1229 1.1079 1.1004 1.0417 1.0348 0.9741 2B 0.990 1.015 1.0438 1.0528 1.1250 3A 0.0000 1.1250 1.1100 — 1.0438 1.0386 0.9762 3B 0.9900 1.0047 1.0438 1.0505 1.1250 11 ⁄ 8 –10 UNS 2A 0.0018 1.1232 1.1103 — 1.0582 1.0520 1.0042 2B 1.017 1.038 1.0600 1.0680 1.1250 11 Designation ⁄ 8 –12 UNF 1A 0.0018 1.1232 1.1060 — 1.0691 1.0601 1.0240 1B 1.035 1.053 1.0709 1.0826 1.1250 2A 0.0018 1.1232 1.1118 — 1.0691 1.0631 1.0240 2B 1.035 1.053 1.0709 1.0787 1.1250 3A 0.0000 1.1250 1.1136 — 1.0709 1.0664 1.0258 3B 1.0350 1.0448 1.0709 1.0768 1.1250 a Class ance Max (Ref.) Class d Min Mine Maxd Min Min Max Min Max Min Copyright 2004, Industrial Press, Inc., New York, NY UNIFIED SCREW THREADS 1745
Page 1 and 2: SCREW THREAD SYSTEMS 1725 Screw Thr
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Page 17 and 18: Nominal Size, Threads per Inch, and
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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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METRIC SCREW THREADS M PROFILE 1799
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Basic Thread METRIC SCREW THREADS M
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METRIC SCREW THREADS M PROFILE 1803
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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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Nominal Diametera BRITISH STANDARD
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Nominal Diameter BRITISH STANDARD I
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Machinery's Handbook 27th Edition A
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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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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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Machinery's Handbook 27th Edition W
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