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DECIMAL EQUIVALENT AND TAP DRILL SIZES
FRACTION OR
DRILL SIZES
DECIMAL
EQUIVALENT
TAP
SIZE
FRACTION OR
DRILL SIZES
DECIMAL
EQUIVALENT
TAP
SIZE
FRACTION OR
DRILL SIZES
DECIMAL
EQUIVALENT
TAP
SIZE
80
.0135
  
27
.1440
  
3/8
.3750
  
79
.0145
  
26
.1470
  
V
.3770
  
1/64
.0156
  
25
.1495
10-24
W
.3860
  
78
.0160
  
24
.1520
  
25/64
.3906
7/16-20
77
.0180
  
23
.1540
  
X
.3970
  
76
.0200
  
5/32
.1562
  
Y
.4040
  
75
.0210
  
22
.1570
  
13/32
.4060
  
74
.0225
  
21
.1580
  
Z
.4130
  
73
.0240
  
20
.1610
  
27/64
.4219
1/2-13
72
.0250
  
19
.1660
  
7/16
.4375
  
71
.0260
  
18
.1695
  
29/64
.4531
1/2-20
70
.0280
  
11/64
.1719
  
15/32
.4687
  
69
.0292
  
17
.1730
  
31/64
.4844
9/16-12
68
.0310
  
16
.1770
12-24
1/2
.5000
  
1/32
.0312
  
15
.1800
  
33/64
.5156
9/16-18
67
.0320
  
14
.1820
12-28
17/32
.5312
5/8-11
66
.0330
  
13
.1850
12-32
35/64
.5469
  
65
.0350
  
3/16
.1875
  
9/16
.5625
  
64
.0360
  
12
.1890
  
37/64
.5781
5/8-18
63
.0370
  
11
.1910
  
19/32
.5937
  
62
.0380
  
10
.1935
  
39/64
.6094
11/16-11
61
.0390
  
9
.1960
  
5/8
.6250
11/16-16
60
.0400
  
8
.1990
  
41/64
.6406
  
59
.0410
  
7
.2010
1/4-20
21/32
.6562
3/4-10
58
.0420
  
13/64
.2031
  
43/64
.6719
  
57
.0430
  
6
.2040
  
11/16
.6875
3/4-16
56
.0465
  
5
.2055
  
45/64
.7031
  
3/64
.0469
0-80
4
.2090
  
23/32
.7187
  
55
.0520
  
3
.2130
1/4-28
47/64
.7344
  
54
.0550
1-56
7/32
.2187
  
3/4
.7500
  
53
.0590
1-64, 72
2
.2210
  
49/64
.7656
7/8-9
1/16
.0625
  
1
.2280
  
25/32
.7812
  
52
.0635
  
A
.2340
  
51/64
.7969
  
51
.0670
  
15/64
.2344
  
13/16
.8125
7/8-14
50
.0700
2-56, 64
B
.2380
  
53/64
.8281
  
49
.0730
  
C
.2420
  
27/32
.8437
  
48
.0760
  
D
.2460
  
55/64
.8594
  
5/64
.0781
  
1/4 E
.2500
  
7/8
.8750
1-8
47
.0785
3-48
F
.2570
5/16-18
57/64
.8906
  
46
.0810
  
G
.2610
  
29/32
.9062
  
45
.0820
3-56, 4-32
17/64
.2656
  
59/64
.9219
1-12
44
.0860
4-38
H
.2660
  
15/16
.9375
1-14
43
.0890
4-40
I
.2720
5/16-24
61/64
.9531
  
42
.0935
4-48
J
.2770
  
31/32
.9687
  
3/32
.0937
  
K
.2810
  
63/64
.9844
1 1/8-7
41
.0960
  
9/32
.2812
  
1
1.00
  
40
.0980
  
L
.2900
        
39
.0995
  
M
.2950
  
PIPE THREAD SIZES
THREAD
DRILL
1/8 -27
R
1/4 -18
7/16
3/8 -18
37/64
1/2 -14
23/32
3/4 - 14
59/64
1 -11-1/2
1-5/32
1-1/4-11-1/2
1-1/2
1-1/2-11-1/2
1-47/64
2-11-1/2
2-7/32
2-1/2-8
2-5/8
3-8
3-1/4
3-1/2-8
3-3/4
4-8
4-1/4
38
.1015
5-40
19/64
.2969
  
37
.1040
5-44
N
.3020
  
36
.1065
6-32
5/16
.3125
3/8-16
7/64
.1094
  
O
.3160
  
35
.1100
  
P
.3230
  
34
.1110
6-36
21/64
.3281
  
33
.1130
6-40
Q
.3320
3/8-24
32
.1160
  
R
.3390
  
31
.1200
  
11/32
.3437
  
1/8
.1250
  
S
.3480
  
30
.1285
  
T
.3580
  
29
.1360
8-32, 36
23/64
.3594
  
28
.1405
8-40
U
.3680
7/16-14
9/64
.1406