Number and Letter Drills
Fractional Drills
Decimal Equivalents
Tap Drill Sizes
80
.0135
Tap Size
Decimal
Drill
79
.0145
0-80
.0469
3/64
1/64
.0156
1-56
.0550
54
78
.0160
1-64, 72
.0590
53
77
.0180
2-56, 64
.0700
50
76
.0200
3-48
.0785
47
75
.0210
3-56, 4-32
.0820
45
74
.0225
4-38
.0860
44
73
.0240
4-40
.0890
43
72
.0250
4-48
.0935
42
71
.0260
5-40
.1015
38
70
.0280
5-44
.1040
37
69
.0292
6-32
.1065
36
68
.0310
6-36
.1110
34
1/32
.0312
6-40
.1130
33
67
.0320
8-32, 36
.1360
29
66
.0330
8-40
.1405
28
65
.0350
10-24
.1495
25
64
.0360
12-24
.1770
16
63
.0370
12-28
.1820
14
62
.0380
12-32
.1850
13
61
.0390
1/4-20
.2010
7
60
.0400
1/4-28
.2130
3
59
.0410
5/16-18
.2570
F
58
.0420
5/16-24
.2720
I
57
.0430
3/8-16
.3125
5/16
56
.0465
3/8-24
.3320
Q
3/64
.0469
7/16-14
.3680
U
55
.0520
7/16-20
.3906
25/64
54
.0550
1/2-13
.4219
27/64
53
.0595
1/2-20
.4531
29/64
1/16
.0625
9/16-12
.4844
31/64
52
.0635
9/16-18
.5156
33/64
51
.0670
5/8-11
5312
17/32
50
.0700
5/8-18
.5781
37/64
49
.0730
11/16-11
.6094
39/64
48
.0760
11/16-16
.6250
5/8
5/64
.0781
3/4-10
.6562
21/32
47
.0785
3/4-16
.6875
11/16
46
.0810
7/8-9
.7656
49/64
45
.0820
7/8-14
.8125
13/16
44
.0860
1-8
.8750
7/8
43
.0890
1-12
.9219
59/64
42
.0935
1-14
.9375
15/16
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
E
1/4
.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
1
1.0000