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Reference Tables -- Standard Drill Sizes

 

 

Standard Drill Sizes
Decimal Equivalents

Drill Decimal Drill Decimal Drill Decimal Drill Decimal Drill Decimal
80 .0135" 70 .0280" 60 .0400" 51 .0670" 3/32 .0938"
79 .0145" 69 .0292" 59 .0410" 50 .0700" 41 .0960"
1/64 .0156" 68 .0310" 58 .0420" 49 .0730" 40 .0980"
78 .0160" 1/32 .0313" 57 .0430" 48 .0760" 39 .0995"
77 .0180" 67 .0320" 56 .0465" 5/64 .0781" 38 .1015"
76 .0200" 66 .0330" 3/64 .0469" 47 .0785" 37 .1040"
75 .0210" 65 .0350" 55 .0520" 46 .0810" 36 .1065"
74 .0225" 64 .0360" 54 .0550" 45 .0820" 7/64 .1094"
73 .0240" 63 .0370" 53 .0595" 44 .0860" 35 .1100"
72 .0250" 62 .0380" 1/16 .0625" 43 .0890" 34 .1110"
71 .0260" 61 .0390" 52 .0635" 42 .0935" 33 .1130"

Drill Decimal Drill Decimal Drill Decimal Drill Decimal Drill Decimal
32 .1160" 23 .1540" 14 .1820" 5 .2055" E .2500"
31 .1200" 5/32 .1562" 13 .1850" 4 .2090" 1/4 .2500"
1/8 .1250" 22 .1570" 3/16 .1875" 3 .2130" F .2570"
30 .1285" 21 .1590" 12 .1890" 7/32 .2188" G .2610"
29 .1360" 20 .1610" 11 .1910" 2 .2210" 17/64 .2656"
28 .1405" 19 .1660" 10 .1935" 1 .2280" H .2660"
9/64 .1406" 18 .1695" 9 .1960" A .2340" I .2720"
27 .1440" 11/64 .1719" 8 .1990" 15/64 .2344" J .2770"
26 .1470" 17 .1730" 7 .2010" B .2380" K .2810"
25 .1495" 16 .1770" 13/64 .2031" C .2420" 9/32 .2812"
24 .1520" 15 .1800" 6 .2040" D .2460" L .2900"


Drill Decimal Drill Decimal Drill Decimal Drill Decimal Drill Decimal
M .2950" 23/64 .3594" 29/64 .4531" 41/64 .6406" 53/64 .8281"
19/64 .2969" U .3680" 15/32 .4688" 21/32 .6562" 27/32 .8438"
N .3020" 3/8 .3750" 31/64 .4844" 43/64 .6719" 55/64 .8594"
5/16 .3125" V .3770" 1/2 .5000" 11/16 .6875" 7/8 .8750"
O .3160" W .3860" 33/64 .5156" 45/64 .7031" 57/64 .8906"
P .3230" 25/64 .3906" 17/32 .5313" 23/32 .7188" 29/32 .9062"
21/64 .3281" X .3970" 35/64 .5469" 47/64 .7344" 59/64 .9219"
Q .3320" Y .4040" 9/16 .5625" 3/4 .7500" 15/16 .9375"
R .3390" 13/32 .4062" 37/64 .5781" 49/64 .7656" 61/64 .9531"
11/32 .3438" Z .4130 19/32 .5938" 25/32 .7812" 31/32 .9688"
S .3480" 27/64 .4219" 39/64 .6094" 51/64 .7969" 63/64 .9844"
T .3580" 7/16 .4375" 5/8 .6250" 13/16 .8125" 1 1.000"

 

 

 

 

 

 

 


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