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Both these designations specify a nominal size of 1 4 in and 20 threads per inch. A constant-pitch unified series consisting of 4, 6, 8, 12, 16, 20, 28, and 32 threads per inch has also been standardized. These are used mostly for sizes over 1 in, and 8 UN, 12 UN, and 16 UN are the preferred pitches.
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23.1 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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THREADED FASTENERS 23.2
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FIGURE 23.1 Basic thread profile for Unified (UN) and metric (M) threads (ISO 68). D(d) = basic major diameter of internal (external) thread; D1(d1) = basic minor diameter of internal (external) thread; D2(d2) = basic pitch diameter of internal (external) thread; p = pitch; H = 0.5 3 p.
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As shown in Table 23.2, the metric series consists of a coarse thread and, often, several fine threads. These are specified by giving the size or major diameter and the pitch (see Fig. 23.1). Typical specifications would be written M 70 1.5 or MJ 70 1.5
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which specifies a major diameter of 70 mm and a pitch of 1.5 mm. Unified threads may be further designated as UN A for external threads and UN B for internal threads. The tolerance classes are 1A, 2A, and 3A for external threads and 1B, 2B, and 3B for internal threads. Class 2 is for general use, class 3 is a tight fit used where great accuracy is required, and class 1 is a loose fit which permits very easy assembly and allows the possibility of nicks on the threads. Metric threads utilize the international tolerance grades (see Chap. 27).
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23.1.1 Choosing the Pitch The Unified coarse-thread series (UNC or UNRC) and the metric coarse-thread series (M or MJ) provide the most resistance to internal thread stripping. Consequently, coarse threads should be used for materials such as brass, cast iron, aluminum, and other lower-strength materials. However, the coarse-thread series are
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
THREADED FASTENERS 23.3
THREADED FASTENERS
TABLE 23.1 Standard Series of UN and UNR Screw Threads
TABLE 23.2 Standard Diameter-Pitch Combinations for Metric M Screw Threads
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
THREADED FASTENERS 23.4 TABLE 23.2 (Continued)
FASTENING, JOINING, AND CONNECTING
Standard Diameter-Pitch Combinations for Metric M Screw Threads
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
THREADED FASTENERS 23.5
THREADED FASTENERS
also widely used with other materials because mass-produced fasteners are usually made with coarse threads and hence are the most economical. The coarse-thread series should also be used whenever fast assembly is needed or when dropping or handling the fasteners may damage the threads by causing nicks or dents. The Unified fine-thread series (UNF or UNRF) and metric fine-thread series (M and MJ) find their greatest use where a high fastener strength is required and where vibration may be a problem. The shallow depth of thread, and hence larger minor diameter, increases the strength of the external member. It also permits a smaller wall thickness for the internal member. Extra-fine-series screw threads are useful for thin nuts, on thin-wall tubing, and where parts may require a very fine adjustment. 23.1.2 Pipe Threads The profile of pipe threads is similar to the UN profile except that there is a taper of 1 on 16 based on the outside diameter.The last few threads will be imperfect because of the taper and the chamfer on the thread-cutting die. Table 23.3 gives the basic dimensions of Unified-inch-series standard pipe threads.
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