Inch Drill and Tap Table

Standard Drill Sizes - Inches
Drill
Decimal
Drill
Decimal
Drill
Decimal
Drill
Decimal
80
=
.0135
43
=
.089
8
=
.199
25/64
=
.3906
79
=
.0145
42
=
.0935
7
=
.201
X
=
.397
1/64
=
.0156
3/32
=
.0938
13/64
=
.2031
Y
=
.404
78
=
.016
41
=
.096
6
=
.204
13/32
=
.4063
77
=
.018
40
=
.098
5
=
.2055
Z
=
.413
76
=
.020
39
=
.0995
4
=
.209
27/64
=
.4219
75
=
.021
38
=
.1015
3
=
.213
7/16
=
.4375
74
=
.0225
37
=
.104
7/32
=
.2188
29/64
=
.4531
73
=
.024
36
=
.1065
2
=
.221
15/32
=
.4688
72
=
.025
7/64
=
.1094
1
=
.228
31/64
=
.4844
71
=
.026
35
=
.110
A
=
.234
1/2
=
.500
70
=
.028
34
=
.111
15/64
=
.2344
33/64
=
.5156
69
=
.0292
33
=
.113
B
=
.238
17/32
=
.5313
68
=
.031
32
=
.116
C
=
.242
35/64
=
.5469
1/32
=
.0313
31
=
.120
D
=
.246
9/16
=
.5625
67
=
.032
1/8
=
.1250
1/4 (E)
=
.250
37/64
=
.5781
66
=
.033
30
=
.1285
F
=
.257
19/32
=
.5938
65
=
.035
29
=
.136
G
=
.261
39/64
=
.6094
64
=
.036
28
=
.1405
17/64
=
.2656
5/8
=
.625
63
=
.037
9/64
=
.1406
H
=
.266
41/64
=
.6406
62
=
.038
27
=
.144
I
=
.272
21/32
=
.6563
61
=
.039
26
=
.147
J
=
.277
43/64
=
.6719
60
=
.040
25
=
.1495
K
=
.281
11/16
=
.6875
59
=
.041
24
=
.152
9/32
=
.2813
45/64
=
.7031
58
=
.042
23
=
.154
L
=
.290
23/32
=
.7188
57
=
.043
5/32
=
.1563
M
=
.295
47/64
=
.7344
56
=
.0465
22
=
.157
19/64
=
.2969
3/4
=
.750
3/64
=
.0469
21
=
.159
N
=
.302
49/64
=
.7656
55
=
.052
20
=
.161
5/16
=
.3125
25/32
=
.7813
54
=
.055
19
=
.166
O
=
.316
51/64
=
.7969
53
=
.0595
18
=
.1695
P
=
.323
13/16
=
.8125
1/16
=
.0625
11/64
=
.1719
21/64
=
.3281
53/64
=
.8281
52
=
.0635
17
=
.173
Q
=
.332
27/32
=
.8438
51
=
.067
16
=
.177
R
=
.339
55/64
=
.8594
50
=
.070
15
=
.180
11/32
=
.3438
7/8
=
.875
49
=
.073
14
=
.182
S
=
.348
57/64
=
.8906
48
=
.076
13
=
.185
T
=
.358
29/32
=
.9063
5/64
=
.0781
3/16
=
.1875
23/64
=
.3594
59/64
=
.9219
47
=
.0785
12
=
.189
U
=
.368
15/16
=
.9375
46
=
.081
11
=
.191
3/8
=
.375
61/64
=
.9531
45
=
.082
10
=
.1935
V
=
.377
31/32
=
.9688
44
=
.086
9
=
.196
W
=
.386
63/64
=
.9844



TAPPING

Tap Drills and Clearance Drills for Machine Screws 
with American National Thread Form

Size of ScrewNo. of 
Threads 
per 
Inch
Tap DrillsClearance Hole Drills
No.  
or 
Dia.
Decimal  
Equiv.
Drill  
Size
Decimal 
Equiv.
Close FitFree Fit
Drill 
Size
Decimal 
Equiv.
Drill 
Size
Decimal 
Equiv.
0.060803/64.046952.063550.0700
1.07364 
72
53 
53
.5959 
.0595
48.076046.0810
2.08656 
64
50 
50
.0700 
.0700
43.089041.0960
3.09948 
56
47 
45
.0785 
.0820
37.104035.1100
4.11236* 
40 
48
44 
43 
42
.0860 
.0890 
.0935
32.116030.1285
5.12540 
44
38 
37
.1015 
.1040
30.128529.1360
6.13832 
40
36 
33
.1065 
.1130
27.144025.1495
8.16432 
36
29 
29
.1360 
.1360
18.169516.1770
10.19024 
32
25 
21
.1495 
.1590
9.19607.2010
12.21624 
28
16 
14
.1770 
.1820
2.2210I.2280
14.24220* 
24*
10 
7
.1935 
.2010
D.2460F.2570
1/4.25020 
28

3
.2010 
.2130
F.2570H.2660
5/16.312518 
24

I
.2570 
.2720
P.3230Q.3320
3/8.37516 
24
5/16 
Q
.3125 
.3320
W.3860X.3970
7/16.437514 
20

25/64
.3680 
.3906
29/64.453115/32.4687
1/2.50013 
20
27/64 
29/64
.4219 
.4531
33/64.515617/32.5312
* Screws marked with asterisk (*) are not in the American Standard but are from the former A.S.M.E. Standard.