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where is the tap drill size, is the major diameter of the tap (e.g., 3 ⁄ 8 in for a 3 ⁄ 8-16 tap), and / is the thread pitch (1 ⁄ 16 inch in the case of a 3 ⁄ 8-16 tap). For a 3 ⁄ 8-16 tap, the above formula would produce 5 ⁄ 16, which is the correct tap drill diameter. The above formula ultimately results in an approximate 75% thread.
Example (inch, coarse): For size 7 ⁄ 16 (this is the diameter of the intended screw in fraction form)-14 (this is the number of threads per inch; 14 is considered coarse), 0.437 in × 0.85 = 0.371 in. Therefore, a size 7 ⁄ 16 screw (7 ⁄ 16 ≈ 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches.
In other words the threadform is intentionally truncated by, for example, drilling the minor diameter a bit large with the larger of two possible tap drills. For example, using a 27/64 (.421) as tap drill for ½-13 yields 75% threads (or thereabouts). Using a 7/16 (.437) as tap drill for ½-13 yields 60% threads (or thereabouts).
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The drill tap size is a column for drill tap sizes either in metric or imperial (just be consistent). Thread diameters and pitches should be in the horizontal row. This is probably the issue with the whole organisation of these tables - be consistent and you won't have the majority of the table with colours and empty cells..
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