Standard drill size chart. Most commonly used in the us but can still be found occasionally in the uk these imperial measurement drill bits come in 164 inch increments. The decimal equivalents of the diameters are shown in both english and metric units. Fractional drill bits are definedby the ansi b9411m 1979 standard. Drill size decimal equivalent tap drill chart decimal equivalent chart drill decimal size mm equivalent 010 0039 020 0079 025 0098 030 0118 80 034 0135.
Fractional and metric sizes per. Drill bits also called twist drills are available with straight or tapered shanks though the most common drill bits will have straight shanks. Click here to download a printable drill size chart. Please send corrections and comments to.
Fractional inch drill size chart. Eng form last updated on.