In addition, 9.5 mm (0.374 in), and 3⁄ 8 in (0.375 in) will work well, although major minus pitch by itself does not tell you this but the 85% ± 2 pp guideline supports it. The drill sizes that are near this are 9.3 mm (0.366 in) and letter U (0.368 in).The major minus pitch also works for inch-based threads, but you must first determine the pitch by looking at the number of treads per inch (TPI for example, 1⁄ 20 = 0.050 and 1⁄ 13 ≈ 0.077), and your result will only land near a tap drill size (not directly on one).(The 85% coarse, 90% fine guideline, within its effective range, matches this in net effect).For metric V threads, major minus pitch yields a good tap drill diameter. ![]() ![]()
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