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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. Below is a chart providing the decimal-fraction equivalents that are most relevant to fractional-inch drill bit sizes (that is, 0 to 1 by 64ths).
The major minus pitch technique also works for inch-based threads, but you must first calculate the pitch by converting the fraction of threads-per-inch (TPI) into a decimal. For example, a screw with a pitch of 1/20 in (20 threads per inch) has a pitch of 0.050 in and a 1 ⁄ 13 in pitch (13 threads per inch) has a pitch of 0.077 in.
Fractional drill bit ... 14 mm - 1.5 12.5 mm: 1/2 16 mm - 2.0 14.0 mm: ... US tap and drill bit size and reference chart [7] Machine screw size
While the above is a common use of center drill bits, it is a technically incorrect practice and should not be considered for production use. The correct tool to start a traditionally drilled hole (a hole drilled by a high-speed steel (HSS) twist drill bit) is a spotting drill bit (or a spot drill bit, as they are referenced in the U.S.). The ...
Fixed. Broke it out into its own separate "List of" article, called List of decimal-fraction equivalents: 0 to 1 by 64ths. — ¾-10 21:07, 6 April 2008 (UTC) I have proposed that the List of decimal-fraction equivalents: 0 to 1 by 64ths is deleted. Reasoning on the talk page. GameKeeper
Screwdriver bits in different sizes for Robertson screws. When Henry Ford tried the Robertson screws, ... Fraction Range in mm Orange #00 #1, #2: 0.05 1.3 [9] Yellow #0