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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.
A handy chart of decimal-fraction equivalents, 0 to 1 by 64ths. Prints nicely as 11x17 in landscape orientation. Useful for machinists who work with inch-based measurements. Date: 24 October 2007: Source: Own work: Author: Three-quarter-ten
Several Dutch units of measurement have been replaced with informal metric equivalents, including the ons or ounce. It originally meant 1 ⁄ 16 of a pound, or a little over 30 g (1.1 oz) depending on which definition of the pound was used, but was redefined as 100 g (3.5 oz) when the country metricated. [42]
[20] [21] [22] The decimal prefix for ten thousand, myria-(sometimes spelt myrio-), and the early binary prefixes double-(2×) and demi-( 1 / 2 ×) were parts of the original metric system adopted by France in 1795, [23] [d] but were not retained when the SI prefixes were internationally adopted by the 11th CGPM conference in 1960.
The French units roughly correspond to the outer circumference of the catheter (see table below). For example, if the French size is 9, the diameter is 9/3 = 3.07 mm. It is seen that the French unit is fully redundant with the metric system but introduces potential for rounding errors.