|
Tap and Drill SizesStaff posted on October 20, 2006 |
Tap and Drill Sizes
SIZE OF SCREW
|
THREADS
|
TAP DRILLS
|
CLEARANCE HOLE DRILLS
|
No. or
dia
|
Decimal equivalent
(inches)
|
Per inch
[per mm]
|
Drill size standard
[metric]
|
Decimal equivalent
|
Close Fit
|
Drill size equiv. |
Decimal
|
|
Free Fit
|
Drill size equiv. |
Decimal
|
|
#2
|
0.086
|
#4
|
0.112
|
#6
|
0.138
|
#8
|
0.164
|
#10
|
0.190
|
1/4
|
0.250
|
3/8
|
0.375
|
3/4
|
0.750
|
M2
|
0.079
|
M2.5
|
0.098
|
M3
|
0.118
|
M4
|
0.157
|
M6
|
0.236
|
M8
|
0.314
|
|
56
|
40
|
32
|
32
|
32
|
20
|
16
|
16
|
[0.4]
|
[0.45]
|
[0.5]
|
[0.7]
|
[1]
|
[1]
|
|
50
|
0.0700
|
43
|
0.0890
|
36
|
0.1065
|
29
|
0.1360
|
21
|
0.1590
|
7
|
0.2010
|
5/16
|
0.3125
|
21/32
|
0.6562
|
[1.60]
|
0.0630
|
[2.05]
|
0.0807
|
[2.50]
|
0.0984
|
[3.30]
|
0.1299
|
[5.00]
|
0.1968
|
[7.00]
|
0.2756
|
|
48
|
0.0760
|
32
|
0.1160
|
27
|
0.1440
|
18
|
0.1695
|
9
|
0.1960
|
F
|
0.2570
|
W
|
0.3860
|
49/64
|
0.7656
|
45
|
0.0820
|
39
|
0.0995
|
1/8
|
0.1250
|
20
|
0.1610
|
C
|
0.2420
|
P
|
0.3230
|
|
46
|
0.0810
|
30
|
0.1285
|
25
|
0.1495
|
16
|
0.1770
|
7
|
0.2010
|
H
|
0.2660
|
25/64
|
0.3906
|
25/32
|
0.7812
|
43
|
0.0890
|
37
|
0.1040
|
29
|
0.1360
|
18
|
0.1695
|
1/4
|
0.2500
|
21/64
|
0.3281
|
|
Drill Sizes |
60
|
0.0400
|
59
|
0.0410
|
58
|
0.0420
|
57
|
0.0430
|
56
|
0.0465
|
3/64
|
0.0469
|
55
|
0.0520
|
54
|
0.0550
|
53
|
0.0595
|
1/16
|
0.0625
|
52
|
0.0635
|
51
|
0.0670
|
50
|
0.0700
|
49
|
0.0730
|
48
|
0.0760
|
5/64
|
0.0781
|
47
|
0.0785
|
46
|
0.0810
|
45
|
0.0820
|
44
|
0.0860
|
43
|
0.0890
|
42
|
0.0935
|
3/32
|
0.0938
|
41
|
0.0960
|
40
|
0.0980
|
39
|
0.0995
|
|
38
|
0.1015
|
37
|
0.1040
|
36
|
0.1065
|
7/64
|
0.1094
|
35
|
0.1100
|
34
|
0.1110
|
33
|
0.1130
|
32
|
0.1160
|
31
|
0.1200
|
1/8
|
0.1250
|
30
|
0.1285
|
29
|
0.1360
|
28
|
0.1405
|
9/64
|
0.1406
|
27
|
0.1440
|
26
|
0.1470
|
25
|
0.1495
|
24
|
0.1520
|
23
|
0.1540
|
5/32
|
0.1562
|
22
|
0.1570
|
21
|
0.1590
|
20
|
0.1610
|
19
|
0.1660
|
18
|
0.1695
|
11/64
|
0.1719
|
|
17
|
0.1730
|
16
|
0.1770
|
15
|
0.1800
|
14
|
0.1820
|
13
|
0.1850
|
3/16
|
0.1875
|
12
|
0.1890
|
11
|
0.1910
|
10
|
0.1935
|
9
|
0.1960
|
8
|
0.1990
|
7
|
0.2010
|
13/64
|
0.2031
|
6
|
0.2040
|
5
|
0.2055
|
4
|
0.2090
|
3
|
0.2130
|
7/32
|
0.2188
|
2
|
0.2210
|
1
|
0.2280
|
A
|
0.2340
|
15/64
|
0.2344
|
B
|
0.2380
|
C
|
0.2420
|
D
|
0.2460
|
E(1/4)
|
0.2500
|
|
F
|
0.2570
|
G
|
0.2610
|
17/64
|
0.2656
|
H
|
0.2660
|
I
|
0.2720
|
J
|
0.2770
|
K
|
0.2810
|
9/32
|
0.2812
|
L
|
0.2900
|
M
|
0.2950
|
19/64
|
0.2969
|
N
|
0.3020
|
5/16
|
0.3125
|
O
|
0.3160
|
P
|
0.3230
|
21/64
|
0.3281
|
Q
|
0.3320
|
R
|
0.3390
|
11/32
|
0.3438
|
S
|
0.3480
|
T
|
0.3580
|
23/64
|
0.3594
|
U
|
0.3680
|
3/8
|
0.3750
|
V
|
0.3770
|
W
|
0.3860
|
|
25/64
|
0.3906
|
X
|
0.3970
|
Y
|
0.4040
|
13/32
|
0.4062
|
Z
|
0.4130
|
27/64
|
0.4219
|
7/16
|
0.4375
|
29/64
|
0.4531
|
15/32
|
0.4688
|
31/64
|
0.4844
|
1/2
|
0.5000
|
17/32
|
0.5312
|
9/16
|
0.5625
|
19/32
|
0.5938
|
5/8
|
0.6250
|
21/32
|
0.6562
|
11/16
|
0.6875
|
23/32
|
0.7188
|
3/4
|
0.7500
|
25/32
|
0.7812
|
13/16
|
0.8125
|
27/32
|
0.8438
|
7/8
|
0.8750
|
29/32
|
0.9062
|
15/16
|
0.9375
|
31/32
|
0.9688
|
|
|