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==Engineering drawing== In American [[engineering drawing]]s, ANSI Y14.6 defines standards for indicating threaded parts. Parts are indicated by their nominal diameter (the nominal major diameter of the screw threads), pitch (number of threads per inch), and the class of fit for the thread. For example, β.750-10 UNC-2Aβ is male (A) with a nominal major diameter of 0.750 inches, 10 threads per inch, and a class-2 fit; β.500-20 UNF-1Bβ would be female (B) with a 0.500-inch nominal major diameter, 20 threads per inch, and a class-1 fit. An arrow points from this designation to the surface in question.<ref>Wilson pp. 77β78 (page numbers may be from an earlier edition).</ref>
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