Standard Drill Sizes
 
Standard Drill Sizes
All Standard Drill Size Bushings Are indicated in Green

 
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"
 

Thread Size/ Tap Drill Size
*Indicates Size of drill to be used before tapping

 

American Standard Thread   ISO Metric Thread
Thread Size Tap Drill Size (in.)*   Thread Size Tap Drill Size(mm)*
0-80 3/64   M1 x 0.25 0.75
1-64 53   M1.1 x 0.25 0.85
1-72 53   M1.2 x 0.25 0.95
2-56 51   M1.4 x 0.3 1.10
2-64 50   M1.6 x 0.35 1.25
3-48 5/64   M1.8 x 0.35 1.45
3-56 46   M2 x 0.4 1.60
4-40 43   M2.2 x 0.45 1.75
4-48 42   M2.5 x 0.45 2.05
5-40 39   M3 x 0.5 2.50
 

 

American Standard Thread   ISO Metric Thread
Thread Size Tap Drill Size (in.)*   Thread Size Tap Drill Size(mm)*
5-44 37   M3.5 x 0.6 2.90
6-32 36   M4 x 0.7 3.30
6-40 33   M4.5 x 0.75 3.70
8-32 29   M5 x 0.8 4.20
8-36 29   M6 x 1 5.00
10-24 25   M7 x 1 6.00
10-32 21   M8 x 1.25 6.80
12-24 17   M9 x 1.25 7.80
12-28 15   M10 x 1.5 8.50
1/4-20 7   M11 x 1.5 9.50
 

 

American Standard Thread   ISO Metric Thread
Thread Size Tap Drill Size (in.)*   Thread Size Tap Drill Size(mm)*
1/4-28 3   M12 x 1.75 10.20
5/16-18 F   M14 x 2 12.00
5/16-24 I   M16 x 2 14.00
3/8-16 5/16   M18 x 2.5 15.50
3/8-24 Q   M20 x 2.5 17.50
7/16-14 U   M22 x 2.5 19.50
7/16-20 W   M24 x 3 21.00
1/2-13 27/64   M27 x 3 24.00
1/2-20 29/64   M30 x 3.5 26.50
9/16-12 31/64   M33 x 3.5 29.50
 

 

American Standard Thread   ISO Metric Thread
Thread Size Tap Drill Size (in.)*   Thread Size Tap Drill Size(mm)*
9/16-18 33/64   M36 x 4 32.00
5/8-11 17/32   M39 x 4 35.00
5/8-18 37/64   M42 x 4.5 37.50
3/4-10 21/32   M45 x 4.5 40.50
3/4-16 11/16   M48 x 5 43.00
7/8-9 49/64   M52 x 5 47.00
7/8-14 13/16   M56 x 5.5 50.50
1"-8 7/8   M60 x 5.5 54.50
1"-14 15/18   M64 x 6 58.00
      M68 x 6 62.00



Updated: 7/23/2010 8:48:00 PM - haldrich

12/18/2017 12:50:47 AM