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1772 UNIFIED SCREW THREADS Table 5g. 28–Thread Series, 28–UN and 28–UNR — Basic Dimensions Sizes Basic Major Dia., Primary Secondary D Basic Pitch Dia., a D 2 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 These are standard sizes of the UNF or UNEF Series. Minor Diameter Lead Ext. Thds., c d 3 (Ref.) Int. Thds., d D 1 Angel λ at Basic P.D. Area of Minor Dia. at D-2h b Tensile Stress Areab Inches Inches Inches Inches Inches Inches Deg. Min. Sq. In. Sq. In. 12 (0.216) e 0.2160 0.1928 0.1734 0.1773 3 22 0.0226 0.0258 1 ⁄4 e 0.2500 0.2268 0.2074 0.2113 2 52 0.0326 0,0364 5 ⁄16 0.3125 0.2893 0.2699 0.2738 2 15 0.0556 0.0606 3 ⁄8 0.3750 0.3518 0.3324 0.3363 1 51 0.0848 0.0909 7 ⁄16 e 0.4375 0.4143 0.3949 0.3988 1 34 0.1201 0.1274 1 ⁄2 e 0.5000 0.4768 0.4574 0.4613 1 22 0.162 0.170 9 ⁄16 0.5625 0.5393 0.5199 0.5238 1 12 0.209 0.219 5 ⁄8 0.6250 0.6018 0.5824 0.5863 1 5 0.263 0.274 11 ⁄16 0.6875 0.6643 0.6449 0.6488 0 59 0.323 0.335 3 ⁄4 0.7500 0.7268 0.7074 0.7113 0 54 0.389 0.402 13 ⁄16 0.8125 0.7893 0.7699 0.7738 0 50 0.461 0.475 7 ⁄8 0.8750 0.8518 0.8324 0.8363 0 46 0.539 0.554 15 ⁄16 0.9375 0.9143 0.8949 0.8988 0 43 0.624 0.640 1 1.0000 0.9768 0.9574 0.9613 0 40 0.714 0.732 11 ⁄ 16 1.0625 1.0393 1.0199 1.0238 0 38 0.811 0.830 11 ⁄ 8 1.1250 1.1018 1.0824 1.0863 0 35 0.914 0.933 13 ⁄ 16 1.1875 1.1643 1.1449 1.1488 0 34 1.023 1.044 11 ⁄ 4 1.2500 1.2268 1.2074 1.2113 0 32 1.138 1.160 15 ⁄ 16 1.3125 1.2893 1.2699 1.2738 0 30 1.259 1.282 13 ⁄ 8 1.3750 1.3518 1.3324 1.3363 0 29 1.386 1.411 17 ⁄ 16 1.4375 1.4143 1.3949 1.3988 0 28 1.52 1.55 11 ⁄ 2 1.5000 1.4768 1.4574 1.4613 0 26 1.66 1.69 Table 5h. 32–Thread Series, 32–UN and 32–UNR — Basic Dimensions Sizes Machinery's Handbook 27th Edition Basic Major Dia.,D Basic Pitch Dia., a D 2 Minor Diameter Lead 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 These are standard sizes of the UNC, UNF, or UNEF Series. Area of Minor Dia. at D - 2h b Tensile Stress Areab Ext.Thds., Angel λ Primary Secondary at Basic P.D. c Int.Thds., d3 (Ref.) d D1 Inches Inches Inches Inches Inches Inches Deg. Min. Sq. In. Sq. In. 6 (0.138) e 0.1380 0.1177 0.1008 0.1042 4 50 0.00745 0.00909 8 (0.164) e 0.1640 0.1437 0.1268 0.1302 3 58 0.01196 0.0140 10 (0.190) e 0.1900 0.1697 0.1528 0.1562 3 21 0.01750 0.0200 12 (0.216) e 0.2160 0.1957 0.1788 0.1822 2 55 0.0242 0.0270 1 ⁄4 e 0.2500 0.2297 0.2128 0.2162 2 29 0.0344 0.0379 5 ⁄16 e 0.3125 0.2922 0.2753 0.2787 1 57 0.0581 0.0625 3 ⁄8 e 0.3750 0.3547 0.3378 0.3412 1 36 0.0878 0.0932 7 ⁄16 0.4375 0.4172 0.4003 0.4037 1 22 0.1237 0.1301 1 ⁄2 0.5000 0.4797 0.4628 0.4662 1 11 0.166 0.173 9 ⁄16 0.5625 0.5422 0.5253 0.5287 1 3 0.214 0.222 5 ⁄8 0.6250 0.6047 0.5878 0.5912 0 57 0.268 0.278 11 ⁄16 0.6875 0.6672 0.6503 0.6537 0 51 0.329 0.339 3 ⁄4 0.7500 0.7297 0.7128 0.7162 0 47 0.395 0.407 13 ⁄16 0.8125 0.7922 0.7753 0.7787 0 43 0.468 0.480 7 ⁄8 0.8750 0.8547 0.8378 0.8412 0 40 0.547 0.560 15 ⁄16 0.9375 0.9172 0.9003 0.9037 0 37 0.632 0.646 1 1.0000 0.9797 0.9628 0.9662 0 35 0.723 0.738 Copyright 2004, Industrial Press, Inc., New York, NY
Machinery's Handbook 27th Edition UNIFIED SCREW THREADS 1773 Thread Classes.—Thread classes are distinguished from each other by the amounts of tolerance and allowance. Classes identified by a numeral followed by the letters A and B are derived from certain Unified formulas (not shown here) in which the pitch diameter tolerances are based on increments of the basic major (nominal) diameter, the pitch, and the length of engagement. These formulas and the class identification or symbols apply to all of the Unified threads. Classes 1A, 2A, and 3A apply to external threads only, and Classes 1B, 2B, and 3B apply to internal threads only. The disposition of the tolerances, allowances, and crest clearances for the various classes is illustrated on pages 1774 and 1774. Classes 2A and 2B: Classes 2A and 2B are the most commonly used for general applications, including production of bolts, screws, nuts, and similar fasteners. The maximum diameters of Class 2A (external) uncoated threads are less than basic by the amount of the allowance. The allowance minimizes galling and seizing in high-cycle wrench assembly, or it can be used to accommodate plated finishes or other coating. However, for threads with additive finish, the maximum diameters of Class 2A may be exceeded by the amount of the allowance, for example, the 2A maximum diameters apply to an unplated part or to a part before plating whereas the basic diameters (the 2A maximum diameter plus allowance) apply to a part after plating. The minimum diameters of Class 2B (internal) threads, whether or not plated or coated, are basic, affording no allowance or clearance in assembly at maximum metal limits. Class 2AG: Certain applications require an allowance for rapid assembly to permit application of the proper lubricant or for residual growth due to high-temperature expansion. In these applications, when the thread is coated and the 2A allowance is not permitted to be consumed by such coating, the thread class symbol is qualified by G following the class symbol. Classes 3A and 3B: Classes 3A and 3B may be used if closer tolerances are desired than those provided by Classes 2A and 2B. The maximum diameters of Class 3A (external) threads and the minimum diameters of Class 3B (internal) threads, whether or not plated or coated, are basic, affording no allowance or clearance for assembly of maximum metal components. Classes 1A and 1B: Classes 1A and 1B threads replaced American National Class 1. These classes are intended for ordnance and other special uses. They are used on threaded components where quick and easy assembly is necessary and where a liberal allowance is required to permit ready assembly, even with slightly bruised or dirty threads. Maximum diameters of Class 1A (external) threads are less than basic by the amount of the same allowance as applied to Class 2A. For the intended applications in American practice the allowance is not available for plating or coating. Where the thread is plated or coated, special provisions are necessary. The minimum diameters of Class 1B (internal) threads, whether or not plated or coated, are basic, affording no allowance or clearance for assembly with maximum metal external thread components having maximum diameters which are basic. Coated 60-deg. Threads.—Although the Standard does not make recommendations for thicknesses of, or specify limits for coatings, it does outline certain principles that will aid mechanical interchangeability if followed whenever conditions permit. To keep finished threads within the limits of size established in the Standard, external threads should not exceed basic size after plating and internal threads should not be below basic size after plating. This recommendation does not apply to threads coated by certain commonly used processes such as hot-dip galvanizing where it may not be required to maintain these limits. Class 2A provides both a tolerance and an allowance. Many thread requirements call for coatings such as those deposited by electro-plating processes and, in general, the 2A allow- Copyright 2004, Industrial Press, Inc., New York, NY
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