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Drill Sizes, Taps, etc.

Last updated on 1/28/2000 by Roger Arrick - editor@controlled.com

As a service to our customers, automation engineers, and machine builders everywhere, Arrick Publishing maintains this information to make your job a little easier. Please contact us if you have any suggestions or comments. Thanks and enjoy, Roger.

Drill Sizes
Number and Letter Drills Fractional Drills Decimal Equivalents
80 .0135
79 .0145
 1/64.0156
78 .0160
77 .0180
76 .0200
75 .0210
74 .0225
73 .0240
72 .0250
71 .0260
70 .0280
69 .0292
68 .0310
 1/32.0312
67 .0320
66 .0330
65 .0350
64 .0360
63 .0370
62 .0380
61 .0390
60 .0400
59 .0410
58 .0420
57 .0430
56 .0465
 3/64.0469
55 .0520
54 .0550
53 .0595
 1/16.0625
52 .0635
51 .0670
50 .0700
49 .0730
48 .0760
 5/64.0781
47 .0785
46 .0810
45 .0820
44 .0860
43 .0890
42 .0935
 3/32.0937
41 .0960
40 .0980
39 .0995
38 .1015
37 .1040
36 .1065
 7/64.1094
35 .1100
34 .1110
33 .1130
32 .1160
31 .1200
 1/8.1250
30 .1285
29 .1360
28 .1405
 9/64.1406
27 .1440
26 .1470
25 .1495
24 .1520
23 .1540
 5/32.1562
22 .1570
21 .1590
20 .1610
19 .1660
18 .1695
 11/64.1719
17 .1720
16 .1770
15 .1800
14 .1820
13 .1850
 3/16.1875
12 .1890
11 .1910
10 .1935
9 .1960
8 .1990
7 .2010
 13/64.2031
6 .2040
5 .2055
4 .2090
3 .2130
 7/32.2187
2 .2210
1 .2280
A .2340
 15/64.2344
B .2380
C .2420
D .2460
E1/4.2500
F .2570
G .2610
 17/64.2656
H .2660
I .2720
J .2770
K .2810
 9/32.2812
L .2900
M .2950
 19/64.2969
N .3020
 5/16.3125
O .3160
P .3230
  21/64.3281
Q .3320
R .3390
  11/32.3437
S .3480
T .3580
  23/64.3594
U .3680
 3/8.3750
V .3770
W .3860
 25/64.3906
X .3970
Y .4040
 13/32.4062
Z .4130
  27/64.4219
  7/16.4375
  29/64.4531
  15/32.4687
  31/64.4844
  1/2.5000
  33/64.5156
  17/32.5312
  35/64.5469
  9/16.5625
  37/64.5781
  19/32.5937
  39/64.6094
  5/8.6250
  41/64.6406
  21/32.6562
  43/64.6719
  11/16.6875
  45/64.7031
  23/32.7187
  47/64.7344
  3/4.7500
  49/64.7656
  25/32.7812
  51/64.7969
  13/16.8125
  53/64.8281
  27/32.8437
  55/64.8594
  7/8.8750
  57/64.8906
  29/32.9062
  59/64.9219
  15/16.9375
  61/64.9531
  31/32.9687
  63/64.9844
  11.0000

 

Taps and Tap Drill Sizes
Tap Size Decimal Drill
0-80 .0469 3/64
1-56 .0550 54
1-64, 72 .0590 53
2-56, 64 .0700 50
3-48 .0785 47
3-56, 4-32 .0820 45
4-38 .0860 44
4-40 .0890 43
4-48 .0935 42
5-40 .1015 38
5-44 .1040 37
6-32 .1065 36
6-36 .1110 34
6-40 .1130 33
8-32, 36 .1360 29
8-40 .1405 28
10-24 .1495 25
12-24 .1770 16
12-28 .1820 14
12-32 .1850 13
1/4-20 .2010 7
1/4-28 .2130 3
5/16-18 .2570 F
5/16-24 .2720 I
3/8-16 .3125 5/16
3/8-24 .3320 Q
7/16-14 .3680 U
7/16-20 .3906 25/64
1/2-13 .4219 27/64
1/2-20 .4531 29/64
9/16-12 .4844 31/64
9/16-18 .5156 33/64
5/8-11 5312 17/32
5/8-18 .5781 37/64
11/16-11 .6094 39/64
11/16-16 .6250 5/8
3/4-10 .6562 21/32
3/4-16 .6875 11/16
7/8-9 .7656 49/64
7/8-14 .8125 13/16
1-8 .8750 7/8
1-12 .9219 59/64
1-14 .9375 15/16

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