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Machinery's Handbook 27th Edition Table 3. (Continued) Standard Series and Selected Combinations — Unified Screw Threads 53 ⁄ 4 –10 UNS 2A 0.0022 5.7478 5.7349 — 5.6828 5.6754 5.6288 2B 5.642 5.663 5.6850 5.6946 5.7500 53 ⁄ 4 –14 UNS 2A 0.0020 5.7480 5.7377 — 5.7016 5.6951 5.6630 2B 5.673 5.688 5.7036 5.7121 5.7500 53 ⁄ 4 –12 UN 2A 0.0021 5.7479 5.7365 — 5.6938 5.6869 5.6487 2B 5.660 5.678 5.6959 5.7049 5.7500 3A 0.0000 5.7500 5.7386 — 5.6959 5.6907 5.6508 3B 5.6600 5.6698 5.6959 5.7026 5.7500 53 Nominal Size, Threads per Inch, and Series Designation ⁄ 4–16 UN 2A 0.0019 5.7481 5.7387 — 5.7075 5.7013 5.6736 2B 5.682 5.696 5.7094 5.7175 5.7500 3A 0.0000 5.7500 5.7406 — 5.7094 5.7047 5.6755 3B 5.6820 5.6908 5.7094 5.7155 5.7500 6–10 UNS 2A 0.0022 5.9978 5.9849 — 5.9328 5.9254 5.8788 2B 5.892 5.913 5.9350 5.9446 6.0000 6–14 UNS 2A 0.0020 5.9980 5.9877 — 5.9516 5.9451 5.9130 2B 5.923 5.938 5.9536 5.9621 6.0000 6–12 UN 2A 0.0021 5.9979 5.9865 — 5.9438 5.9369 5.8987 2B 5.910 5.928 5.9459 5.9549 6.0000 3A 0.0000 6.0000 5.9886 — 5.9459 5.9407 5.9008 3B 5.9100 5.9198 5.9459 5.9526 6.0000 6–16 UN 2A 0.0019 5.9981 5.9887 — 5.9575 5.9513 5.9236 2B 5.932 5.946 5.9594 5.9675 6.0000 3A 0.0000 6.0000 5.9906 — 5.9594 5.9547 5.9255 3B 5.9320 5.9408 5.9594 5.9655 6.0000 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 a Use UNR designation instead of UN wherever UNR thread form is desired for external use. b Regarding combinations of thread classes, see text on page 1773. c UN series external thread maximum minor diameter is basic for Class 3A and basic minus allowance for Classes 1A and 2A. d For Class 2A threads having an additive finish the maximum is increased, by the allowance, to the basic size, the value being the same as for Class 3A. e For unfinished hot-rolled material not including standard fasteners with rolled threads. f Formerly NF, tolerances and allowances are based on one diameter length of engagement. All dimensions in inches. Use UNS threads only if Standard Series do not meet requirements (see pages 1733, 1765, and 1776). For additional sizes above 4 inches see ASME/ANSI B1.1- 1989 (R2001). Copyright 2004, Industrial Press, Inc., New York, NY 1762 UNIFIED SCREW THREADS
Machinery's Handbook 27th Edition UNIFIED SCREW THREADS 1763 Coarse-Thread Series: This series, UNC/UNRC, is the one most commonly used in the bulk production of bolts, screws, nuts and other general engineering applications. It is also used for threading into lower tensile strength materials such as cast iron, mild steel and softer materials (bronze, brass, aluminum, magnesium and plastics) to obtain the optimum resistance to stripping of the internal thread. It is applicable for rapid assembly or disassembly, or if corrosion or slight damage is possible. Table 4a. Coarse-Thread Series, UNC and UNRC — Basic Dimensions Sizes No. or Basic Major Dia., D Thds. per Inch, Basic Pitch Dia., Inches n a D2 Minor Diameter Lead Angle λ at Basic P.D. Area of Minor Dia. at D-2hb Tensile Stress Areab Ext. Thds., c Int. Thds., d3 (Ref.) d D1 Inches Inches Inches Inches Deg. Min Sq. In. Sq. In. 1 (0.073) e 0.0730 64 0.0629 0.0544 0.0561 4 31 0.00218 0.00263 2 (0.086) 0.0860 56 0.0744 0.0648 0.0667 4 22 0.00310 0.00370 3 (0.099) e 0.0990 48 0.0855 0.0741 0.0764 4 26 0.00406 0.00487 4 (0.112) 0.1120 40 0.0958 0.0822 0.0849 4 45 0.00496 0.00604 5 (0.125) 0.1250 40 0.1088 0.0952 0.0979 4 11 0.00672 0.00796 6 (0.138) 0.1380 32 0.1177 0.1008 0.1042 4 50 0.00745 0.00909 8 (0.164) 0.1640 32 0.1437 0.1268 0.1302 3 58 0.01196 0.0140 10 (0.190) 0.1900 24 0.1629 0.1404 0.1449 4 39 0.01450 0.0175 12 (0.216) e 0.2160 24 0.1889 0.1664 0.1709 4 1 0.0206 0.0242 1 ⁄4 0.2500 20 0.2175 0.1905 0.1959 4 11 0.0269 0.0318 5 ⁄16 0.3125 18 0.2764 0.2464 0.2524 3 40 0.0454 0.0524 3 ⁄8 0.3750 16 0.3344 0.3005 0.3073 3 24 0.0678 0.0775 7 ⁄16 0.4375 14 0.3911 0.3525 0.3602 3 20 0.0933 0.1063 1 ⁄2 0.5000 13 0.4500 0.4084 0.4167 3 7 0.1257 0.1419 9 ⁄16 0.5625 12 0.5084 0.4633 0.4723 2 59 0.162 0.182 5 ⁄8 0.6250 11 0.5660 0.5168 0.5266 2 56 0.202 0.226 3 ⁄4 0.7500 10 0.6850 0.6309 0.6417 2 40 0.302 0.334 7 ⁄8 0.8750 9 0.8028 0.7427 0.7547 2 31 0.419 0.462 1 1.0000 8 0.9188 0.8512 0.8647 2 29 0.551 0.606 11 ⁄ 8 1.1250 7 1.0322 0.9549 0.9704 2 31 0.693 0.763 11 ⁄ 4 1.2500 7 1.1572 1.0799 1.0954 2 15 0.890 0.969 13 ⁄ 8 1.3750 6 1.2667 1.1766 1.1946 2 24 1.054 1.155 11 ⁄ 2 1.5000 6 1.3917 1.3016 1.3196 2 11 1.294 1.405 13 ⁄ 4 1.7500 5 1.6201 1.5119 1.5335 2 15 1.74 1.90 2 2.0000 41 ⁄ 2 1.8557 1.7353 1.7594 2 11 2.30 2.50 21 ⁄ 4 2.2500 41 ⁄ 2 2.1057 1.9853 2.0094 1 55 3.02 3.25 21 ⁄ 2 2.5000 4 2.3376 2.2023 2.2294 1 57 3.72 4.00 23 ⁄ 4 2.7500 4 2.5876 2.4523 2.4794 1 46 4.62 4.93 3 3.0000 4 2.8376 2.7023 2.7294 1 36 5.62 5.97 31 ⁄ 4 3.2500 4 3.0876 2.9523 2.9794 1 29 6.72 7.10 31 ⁄ 4 3.500 4 3.3376 3.2023 3.2294 1 22 7.92 8.33 33 ⁄ 4 3.7500 4 3.5876 3.4523 3.4794 1 16 9.21 9.66 4 4.0000 4 3.8376 3.7023 3.7294 1 11 10.61 11.08 a British: Effective Diameter. b See formula, pages 1502 and 1510. c Design form for UNR threads. (See figure on page 1733.) d Basic minor diameter. e Secondary sizes. Fine-Thread Series: This series, UNF/UNRF, is suitable for the production of bolts, screws, and nuts and for other applications where the Coarse series is not applicable. External threads of this series have greater tensile stress area than comparable sizes of the Coarse series. The Fine series is suitable when the resistance to stripping of both external Copyright 2004, Industrial Press, Inc., New York, NY
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