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For both of these rules of thumb (85%/90% and major minus pitch), the tap drill size yielded is not necessarily the only possible one, but it is a good one for general use. The 85% and 90% rules works best in the range of 1 ⁄ 4 –1 in (6.4–25.4 mm), the sizes most important on many shop floors. Some sizes outside that range have different ...
4.1 List of hex head sizes. ... 75% tap drill size (in) (mm) (in −1) (mm) (in) (mm) ... 1 ⁄ 4: 6.350 20: 1.270 0.1860 4.724 #9: 5.1 5 ...
One aspect of this method of sizing is that the size increment between drill bits becomes larger as bit sizes get smaller: 100% for the step from 1/64 to 1/32, but a much smaller percentage between 1 47/64 and 1 3/4. Drill bit sizes are written as irreducible fractions. So, instead of 78/64 inch, or 1 14/64 inch, the size is noted as 1 7/32 inch.
where is the tap drill size, is the major diameter of the tap (e.g., 10 mm for a M10×1.5 tap), and pitch is the pitch of the thread (1.5 mm in the case of a standard M10 tap) and so the correct drill size is 8.5 mm. This works for both fine and coarse pitches, and also produces an approximate 75% thread.
For example, a 1 ⁄ 4-20 thread has 20 TPI, ... In the case of female threads, tap drill charts typically specify sizes that will produce an approximate 75% thread ...
0–20 12–26 Cast iron. 90–118 24–32 7–20 Mild steel. 118–135 ... Drill and tap size chart; Drill bit shank; Drill bit sizes; Drill rod; Endmill; References.
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3579 S High St, Columbus, OH · Directions · (614) 409-0683