Drill Bit Sizes Inch and Decimal

Drill bits can be made in any size, but standards define sets of sizes that are widely produced and stocked. In the U.S., fractional inch and gauge drill bit sizes are in common use.
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In nearly all other countries, metric drill bit sizes are most common (like Bovidix 1902103423). A comprehensive table for metric sizes can be found at the drill size chart.

Drill Bit Sizes Inch and Decimal

Drill SizeDecimal EquivDrill SizeDecimal EquivDrill SizeDecimal Equiv.Drill SizeDecimal Equiv
80=0.013543=0.0898=0.19925/64=0.3906
79=0.014542=0.09357=0.201X=0.397
1/64=0.01563/32=0.093813/64=0.2031Y=0.404
78=0.01641=0.0966=0.20413/32=0.4063
77=0.01840=0.0985=0.2055Z=0.413
76=0.02039=0.09954=0.20927/64=0.4219
75=0.02138=0.10153=0.2137/16=0.4375
74=0.022537=0.1047/32=0.218829/64=0.4531
73=0.02436=0.10652=0.22115/32=0.4688
72=0.0257/64=0.10941=0.22831/64=0.4844
71=0.02635=0.110A=0.2341/2=0.500
70=0.02834=0.11115/64=0.234433/64=0.5156
69=0.029233=0.113B=0.23817/32=0.5313
68=0.03132=0.116C=0.24235/64=0.5469
1/32=0.031331=0.120D=0.2469/16=0.5625
67=0.0321/8=0.12501/4 (E)=0.25037/64=0.5781
66=0.03330=0.1285F=0.25719/32=0.5938
65=0.03529=0.136G=0.26139/64=0.6094
64=0.03628=0.140517/64=0.26565/8=0.625
63=0.0379/64=0.1406H=0.26641/64=0.6406
62=0.03827=0.144I=0.27221/32=0.6563
61=0.03926=0.147J=0.27743/64=0.6719
60=0.04025=0.1495K=0.28111/16=0.6875
59=0.04124=0.1529/32=0.281345/64=0.7031
58=0.04223=0.154L=0.29023/32=0.7188
57=0.0435/32=0.1563M=0.29547/64=0.7344
56=0.046522=0.15719/64=0.29693/4=0.750
3/64=0.046921=0.159N=0.30249/64=0.7656
55=0.05220=0.1615/16=0.312525/32=0.7813
54=0.05519=0.166O=0.31651/64=0.7969
53=0.059518=0.1695P=0.32313/16=0.8125
1/16=0.062511/64=0.171921/64=0.328153/64=0.8281
52=0.063517=0.173Q=0.33227/32=0.8438
51=0.06716=0.177R=0.33955/64=0.8594
50=0.07015=0.18011/32=0.34387/8=0.875
49=0.07314=0.182S=0.34857/64=0.8906
48=0.07613=0.185T=0.35829/32=0.9063
5/64=0.07813/16=0.187523/64=0.359459/64=0.9219
47=0.078512=0.189U=0.36815/16=0.9375
46=0.08111=0.1913/8=0.37561/64=0.9531
45=0.08210=0.1935V=0.37731/32=0.9688
44=0.0869=0.196W=0.38663/64=0.9844

 

Drill Bit Sizes

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Summary
Inch and Decimal Drill Bit Sizes, Table of Correspondence
Article Name
Inch and Decimal Drill Bit Sizes, Table of Correspondence
Description
Standards define sets of sizes that are widely produced and stocked. In the US, fractional inch and gauge drill bit sizes are in common use.
Author
Publisher Name
BestDrillBit.com
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12 thoughts on “Drill Bit Sizes Inch and Decimal”

  1. The great gauge at the beginning of the article – Irwin.
    It is indispensable and comes at a great price on Amazzon.
    The gauge made of steel and is almost indestructible.
    I’ve found many uses for it like determining bit size, finding screw sizes, etc.
    I could not live without it!

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