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Machinery's Handbook 27th Edition 1764 UNIFIED SCREW THREADS and mating internal threads equals or exceeds the tensile load carrying capacity of the externally threaded member (see page 1510). It is also used where the length of engagement is short, where a smaller lead angle is desired, where the wall thickness demands a fine pitch, or where finer adjustment is needed. Table 4b. Fine-Thread Series, UNF and UNRF — 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. 0 (0.060) 0.0600 80 0.0519 0.0451 0.0465 4 23 0.00151 0.00180 1 (0.073) e 0.0730 72 0.0640 0.0565 0.0580 3 57 0.00237 0.00278 2 (0.086) 0.0860 64 0.0759 0.0674 0.0691 3 45 0.00339 0.00394 3 (0.099) e 0.0990 56 0.0874 0.0778 0.0797 3 43 0.00451 0.00523 4 (0.112) 0.1120 48 0.0985 0.0871 0.0894 3 51 0.00566 0.00661 5 (0.125) 0.1250 44 0.1102 0.0979 0.1004 3 45 0.00716 0.00830 6 (0.138) 0.1380 40 0.1218 0.1082 0.1109 3 44 0.00874 0.01015 8 (0.164) 0.1640 36 0.1460 0.1309 0.1339 3 28 0.01285 0.01474 10 (0.190) 0.1900 32 0.1697 0.1528 0.1562 3 21 0.0175 0.0200 12 (0.216) e 0.2160 28 0.1928 0.1734 0.1773 3 22 0.0226 0.258 1 ⁄4 0.2500 28 0.2268 0.2074 0.2113 2 52 0.0326 0.0364 5 ⁄16 0.3125 24 0.2854 0.2629 0.2674 2 40 0.0524 0.0580 3 ⁄8 0.3750 24 0.3479 0.3254 0.3299 2 11 0.0809 0.0878 7 ⁄16 0.4375 20 0.4050 0.3780 0.3834 2 15 0.1090 0.1187 1 ⁄2 0.5000 20 0.4675 0.4405 0.4459 1 57 0.1486 0.1599 9 ⁄16 0.5625 18 0.5264 0.4964 0.5024 1 55 0.189 0.203 5 ⁄8 0.6250 18 0.5889 0.5589 0.5649 1 43 0.240 0.256 3 ⁄4 0.7500 16 0.7094 0.6763 0.6823 1 36 0.351 0.373 7 ⁄8 0.8750 14 0.8286 0.7900 0.7977 1 34 0.480 0.509 1 1.0000 12 0.9459 0.9001 0.9098 1 36 0.625 0.663 11 ⁄ 8 1.1250 12 1.0709 1.0258 1.0348 1 25 0.812 0.856 11 ⁄ 4 1.2500 12 1.1959 1.1508 1.1598 1 16 1.024 1.073 13 ⁄ 8 1.3750 12 1.3209 1.2758 1.2848 1 9 1.260 1.315 11 ⁄ 2 1.5000 12 1.4459 1.4008 1.4098 1 3 1.521 1.581 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. Extra-Fine-Thread Series: This series, UNEF/UNREF, is applicable where even finer pitches of threads are desirable, as for short lengths of engagement and for thin-walled tubes, nuts, ferrules, or couplings. It is also generally applicable under the conditions stated above for the fine threads. See Table 4c. Fine Threads for Thin-Wall Tubing: Dimensions for a 27-thread series, ranging from 1 ⁄ 4to 1-inch nominal size, also are included in Table 3. These threads are recommended for general use on thin-wall tubing. The minimum length of complete thread is one-third of the basic major diameter plus 5 threads (+ 0.185 in.). Selected Combinations: Thread data are tabulated in Table 3 for certain additional selected special combinations of diameter and pitch, with pitch diameter tolerances based on a length of thread engagement of 9 times the pitch. The pitch diameter limits are applicable to a length of engagement of from 5 to 15 times the pitch. (This provision should not be confused with the lengths of thread on mating parts, as they may exceed the length of engagement by a considerable amount.) Thread symbols are UNS and UNRS. Copyright 2004, Industrial Press, Inc., New York, NY
UNIFIED SCREW THREADS 1765 Table 4c. Extra-Fine-Thread Series, UNEF and UNREF — Basic Dimensions Sizes No. or Inches Machinery's Handbook 27th Edition Basic Major Dia., D Thds. per Inch, Basic Pitch Dia., 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. 12 (0.216) e 0.2160 32 0.1957 0.1788 0.1822 2 55 0.0242 0.0270 1 ⁄4 0.2500 32 0.2297 0.2128 0.2162 2 29 0.0344 0.0379 5 ⁄16 0.3125 32 0.2922 0.2753 0.2787 1 57 0.0581 0.0625 3 ⁄8 0.3750 32 0.3547 0.3378 0.3412 1 36 0.0878 0.0932 7 ⁄16 0.4375 28 0.4143 0.3949 0.3988 1 34 0.1201 0.1274 1 ⁄2 0.5000 28 0.4768 0.4574 0.4613 1 22 0.162 0.170 9 ⁄16 0.5625 24 0.5354 0.5129 0.5174 1 25 0.203 0.214 5 ⁄8 0.6250 24 0.5979 0.5754 0.5799 1 16 0.256 0.268 11 ⁄16 e 0.6875 24 0.6604 0.6379 0.6424 1 9 0.315 0.329 3 ⁄4 0.7500 20 0.7175 0.6905 0.6959 1 16 0.369 0.386 13 ⁄16 e 0.8125 20 0.7800 0.7530 0.7584 1 10 0.439 0.458 7 ⁄8 0.8750 20 0.8425 0.8155 0.8209 1 5 0.515 0.536 15 ⁄16 e 0.9375 20 0.9050 0.8780 0.8834 1 0 0.598 0.620 1 1.0000 20 0.9675 0.9405 0.9459 0 57 0.687 0.711 1 1 ⁄ 16 e 1.0625 18 1.0264 0.9964 1.0024 0 59 0.770 0.799 1 1 ⁄ 8 1.1250 18 1.0889 1.0589 1.0649 0 56 0.871 0.901 1 3 ⁄ 16 e 1.1875 18 1.1514 1.1214 1.1274 0 53 0.977 1.009 1 1 ⁄ 4 1.2500 18 1.2139 1.1839 1.1899 0 50 1.090 1.123 1 5 ⁄ 16 e 1.3125 18 1.2764 1.2464 1.2524 0 48 1.208 1.244 1 3 ⁄ 8 1.3750 18 1.3389 1.3089 1.3149 0 45 1.333 1.370 1 7 ⁄ 16 e 1.4375 18 1.4014 1.3714 1.3774 0 43 1.464 1.503 1 1 ⁄ 2 1.5000 18 1.4639 1.4339 1.4399 0 42 1.60 1.64 1 9 ⁄ 16 e 1.5625 18 1.5264 1.4964 1.5024 0 40 1.74 1.79 1 5 ⁄ 8 1.6250 18 1.5889 1.5589 1.5649 0 38 1.89 1.94 1 11 ⁄ 16 e 1.6875 18 1.6514 1.6214 1.6274 0 37 2.05 2.10 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. Other Threads of Special Diameters, Pitches, and Lengths of Engagement: Thread data for special combinations of diameter, pitch, and length of engagement not included in selected combinations are also given in the Standard but are not given here. Also, when design considerations require non-standard pitches or extreme conditions of engagement not covered by the tables, the allowance and tolerances should be derived from the formulas in the Standard. The thread symbol for such special threads is UNS. Constant Pitch Series.—The various constant-pitch series, UN, with 4, 6, 8, 12, 16, 20, 28 and 32 threads per inch, given in Table 3, offer a comprehensive range of diameter-pitch combinations for those purposes where the threads in the Coarse, Fine, and Extra-Fine series do not meet the particular requirements of the design. When selecting threads from these constant-pitch series, preference should be given wherever possible to those tabulated in the 8-, 12-, or 16-thread series. 8-Thread Series: The 8-thread series (8-UN) is a uniform-pitch series for large diameters. Although originally intended for high-pressure-joint bolts and nuts, it is now widely used as a substitute for the Coarse-Thread Series for diameters larger than 1 inch. Copyright 2004, Industrial Press, Inc., New York, NY
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