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Reference Tables -- Standard Drill Sizes


 

Millimeter Sizes
Decimal Equivalents

mm Decimal mm Decimal mm Decimal mm Decimal mm Decimal
.35 .0138" .90 .0354" 1.45 .0571" 2.00 .0787" 2.55 .1004"
.40 .0157" .95 .0374" 1.50 .0591" 2.05 .0807" 2.60 .1024"
.45 .0177" 1.0 .0394" 1.55 .0610" 2.10 .0827" 2.65 .1043"
.50 .0197" 1.05 .0413" 1.60 .0630" 2.15 .0846" 2.70 .1063"
.55 .0217" 1.10 .0433" 1.65 .0650" 2.20 .0866" 2.75 .1083"
.60 .0236" 1.15 .0453" 1.70 .0669" 2.25 .0886'' 2.80 .1102"
.65 .0256" 1.20 .0472" 1.75 .0689" 2.30 .0906" 2.85 .1122"
.70 .0276" 1.25 .0492" 1.80 .0709" 2.35 .0925" 2.90 .1142"
.75 .0295" 1.30 .0512" 1.85 .0728" 2.40 .0945" 3.00 .1181"
.80 .0315" 1.35 .0531" 1.90 .0748" 2.45 .0965" 3.10 .1220"
.85 .0335" 1.40 .0551" 1.95 .0768" 2.50 .0984" 3.20 .1260"


mm Decimal mm Decimal mm Decimal mm Decimal mm Decimal
3.25 .1280" 4.1 .1614" 4.9 .1929" 5.75 .2264" 6.6 .2598"
3.30 .1299" 4.2 .1654" 5 .1969" 5.8 .2283" 6.7 .2638"
3.40 .1339" 4.25 .1673" 5.1 .2008" 5.9 .2323" 6.75 .2657"
3.50 .1378" 4.3 .1693" 5.2 .2047" 6 .2362" 6.8 .2677"
3.6 .1417" 4.4 .1732" 5.25 .2067" 6.1 .2402" 6.9 .2717"
3.7 .1457" 4.5 .1772" 5.3 .2087" 6.2 .2441" 7 .2756"
3.75 .1476" 4.6 .1811" 5.4 .2126" 6.25 .2461" 7.1 .2795"
3.8 .1496" 4.7 .1850" 5.5 .2165" 6.3 .2480" 7.2 .2835"
3.9 .1535" 4.75 .1870" 5.6 .2205" 6.4 .2520" 7.25 .2854"
4 .1575" 4.8 .1890" 5.7 .2244" 6.5 .2559" 7.3 .2874"


mm Decimal mm Decimal mm Decimal mm Decimal mm Decimal
7.4 .2913" 8.25 .3248" 9.1 .3583" 9.9 .3898" 14.5 .5709"
7.5 .2953" 8.3 .3268" 9.2 .3622" 10 .3937" 15 .5906"
7.6 .2992" 8.4 .3307" 9.25 .3642" 10.5 .4134" 15.5 .6102"
7.7 .3031" 8.5 .3346" 9.3 .3661" 11 .4331" 16 .6229"
7.75 .3051" 8.6 .3386" 9.4 .3701" 11.5 .4528" 16.5 .6496"
7.8 .3071" 8.7 .3425" 9.5 .3740" 12 .4724" 17 .6693"
7.9 .3110" 8.75 .3445" 9.6 .3780" 12.5 .4921" 17.5 .6890"
8 .3150" 8.8 .3465" 9.7 .3819" 13 .5118" 18 .7087"
8.1 .3189" 8.9 .3504" 9.75 .3839" 13.5 .5315" 18.5 .7283"
8.2 .3228" 9 .3543" 9.8 .3858" 14 .5512" 19 .7480"


mm Decimal mm Decimal mm Decimal
19.5 .7677" 21.5 .8465" 23.5 .9252"
20 .7874" 22 .8661" 24 .9449"
20.5 .8071" 22.5 .8858" 24.5 .9646"
21 .8268" 23 .9055" 25 .9843"

 

 

 

 

 

 

 

 

 

 


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