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Table 5-11.  Basic Coarse Thread Dimensions and Tap Drill Sizes - Continued
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Table 5-12.  Annealed Copper Wire Data - Continued
TM 9-254 5-9. Screw Thread - Continued Table 5-11.  Basic Coarse Thread Dimensions and Tap Drill Sizes - Continued Commercial Decimal Nominal size Outside Pitch Root tap drill to equivalent diameter diameter diameter produce approx of tap Inch Threads (in.) (in.) (in.) 75 percent drill per inch full thread 2 3/4-4 2.7500 2.5876 2.4252 2 1/2 2.5000 3-3 1/2 3.0000 2.8145 2.6288 2 23/32 2.7187 3 1/4-3 1/2 3.2500 3.0645 2.8788 2 31/32 2.9687 3 1/2-3 1/4 3.5000 3.3002 3.1003 3 3/16 3.1875 3 3/4-3 3.7500 3.5335 3.3170 3 7/16 3.4375 4-3 4.0000 3.7835 3.5670 3 11/16 3.6875 5-10. Wire Gage. a. The size of wire may be designated either by gage number or by its diameter in mils.  Usually the size of wire less than one-half of a inch in diameter is stated in gage number.  Wire larger than one-half of an inch in diameter usually is described in terms of its diameter in mils (one-thousandth of an inch) or in terms of its cross-sectional area in circular mils.  The size (gage number) of a solid wire refers to the cross-section of the wire perpendicular to its length.  The size or gage number of a stranded wire refers to its total cross-section b. American Wire Gage is commonly used in the United States for copper and aluminum wire and in general for wire used in electrical work.  It is designated by the abbreviation AWG. c. Data   on   the   relations   of   length,   mass,   and   resistance   of   annealed   copper   wire   in   abbreviation   AWG. American Wire Gage sizes is listed in table 5-12. Table 5-12.  Annealed Copper Wire Data Cross-section at 20°C Ohms per 1000 feet Gage Diameter no. in mils Circular Square 0°C 20°C 75° C (AWG) at 20°C mils inches (32° F) (68° F) (167° F) 0 324.8 105,500 .08289 .09055 .09827 .1195 2 257.6 66,370 .05213 .1440 .1563 .1900 4 204.3 41,740 .03278 .2289 .2485 .3022 6 162.0 26,250 .02062 .3640 .3951. .4805 8 128.5 16,510 .01297 .5788 .6282 .7640 5-26

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