Drill bit size o. Fractional and metric sizes per. Made from high quality high speed steel hss made in the usa. Size decimal equivalent size decimal equivalent size decimal equivalent size decimal equivalent. Eng form last updated on.
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. In practice you will seldom see number sizes past 80. Number drill bit sizes letter drill bit sizes. Whats included 1 drill bit o size.
This chart shows decimal inch equivalents for fractional inch wire size letter size and metric drill bits up to two inches in diameter. Because of differences in numbering systems some conversions are approximated but are within 0001 inch. Drill bit sizes are written as irreducible fractions. If all else fails you may want to use our tap drill size calculator.
For use with pen or pencil kits that call for an o size hole. The asme b9411m twist drill standard establishes number drill bit sizes from size 1 to 97. Please send corrections and comments to. Use this precision ground twist drill bit to bore perfectly sized holes in pen turning blanks.
A good drill size chart can also be used as a handy decimal equivalence chart as well as to convert decimal sizes to metric.