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Letter Drill Size Conversion. The fractions used are always in their simplest form, i.e. Although the asme b94.11m twist drill standard, for example, lists sizes as small as size 97, sizes smaller than 80 are rarely encountered in practice.
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This chart shows the diameters of letter gauge drills size a (the smallest) to size z (the largest. Conversions for fractional, decimal number & letter drill sizes. The fractions used are always in their simplest form, i.e.
Fraction of an inch inch mm fraction of an inch inch mm fraction of an inch
The drill size chart contains tools up to 1.5 inches in diameter, but larger tools are also commonly used. Conversions for fractional, decimal number & letter drill sizes. Letter size drills diameter in inches; 60 degree double cut carbide burrs
