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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).
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.
English: a ruler from 0 to 1 inch (in.) in 1/32 inch divisions below the line and 1/2 millimetre (mm) divisions above the line to give a visual representation of the approximations. Principally designed to help visually determine if a metric or imperial drill bit will suffice.
The metric screw tap and clearance sizes are largely missing, and those clearance hole sizes that are present are more often incorrect; e.g. M5 x 0.8 has 5.1 mm as close fit, but this would be an interference fit, all sources have 5.3 mm. (0.1 mm is below the sum of surface roughness and tolerance of the screw and clearance drill diameter ...
Subdivisions of an inch are typically written using dyadic fractions with odd number numerators; for example, two and three-eighths of an inch would be written as 2 + 3 / 8 ″ and not as 2.375″ nor as 2 + 6 / 16 ″. However, for engineering purposes fractions are commonly given to three or four places of decimals and have been ...
(But note that sizes thinner than 1 ⁄ 2 ″ are also sometimes specified as fractions of an inch; see the Conversion Table to see how these interleave with gauges.) Even though the gauge system was originally meant for wire, it is now used regardless of whether an item of body jewelry is an actual wire, or is instead a wooden plug, a plastic ...
≡ 1 ⁄ 3 mm = 0. 3 ... cubic inch per second in 3 /s ≡ 1 in 3 /s = 1.638 7064 ...
Round to a multiple of a given fraction: 2 + 3 ⁄ 16 inch Specify the desired denominator using |frac=<some positive integer> . ( Denominator is the below-the-slash number, for example the 3 in 1 ⁄ 3 ).