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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).
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.
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.
For example, a catheter with a French size of 9 would have an outer diameter of approximately 3 mm. While the French scale aligns closely with the metric system, it introduces redundancy and the potential for rounding errors. This metrication problem is further complicated in medical contexts where metric and imperial units are used interchangeably
English: Measuring tape diagram showing fractions of a inch in 1/2, 1/4, 1/8 and 1/16ths. Date: 23 July 2015: Source: Own work: Author: Offnfopt . The SVG code is .
(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 ...
Equivalent mesh sizes from 5 μm to 25.4 mm also exist. [1] [2] [3] Available sieve sizes are usually regulated by standards. Those in common use are ISO 565:1990 and ISO 3310-1:2000 (international), [4] EN 933-1(European) [5] and ASTM E11:01 (US). EN standards are available with national 'badging'; so they appear as BS EN, FR EN, DE EN, etc.
The American pica of 0.16604 inches (4.217 mm). It was established by the United States Type Founders' Association in 1886. [1] [2] In TeX one pica is 400 ⁄ 2,409 of an inch. The contemporary computer PostScript pica is exactly 1 ⁄ 6 of an inch or 1 ⁄ 72 of a foot, i.e. 4.2 3 mm or 0.1 6 in.