Ebn Fastener Hole Guide Chart
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1
2
3Evansville, IN
812-477-0077
Henderson, KY
270-830-0077
Jasper, IN
812-482-5105
Owensboro, KY
270-684-0877
Vincennes, IN
812-882-4090
Mt. Vernon, IL
618-244-7156
Fastener Hole Guide
Call EBN for Drill Bits & Taps
For This
For This
Size
Size
Drill This
To Tap
Wood
Drill This
To Tap
Wood
Drill This
To Tap
Size Hole
For This
Screw
Size Hole
For This
Screw
Size Hole
For This
Size Bolt
Pilot
Size Bolt
Pilot
Size Bolt
Drill
Dec.
Or Screw
In Hard
Drill
Dec.
Or Screw
In Hard
Drill
Dec.
Or Screw
Size
Equiv.
Wood
Size
Equiv.
Wood
Size
Equiv.
60
.0400
9/64
.1406
E
.2500
59
.0410
27
.1440
9 x 30
F
.2570
5/16 x 18
26
.1470
3/16 x 24
58
.0420
G
.2610
25
.1495
10 x 24
No. 14
57
.0430
17/64
.2656
5/16 x 18*
24
.1520
56
.0465
0 x 80
H
.2660
23
.1540
10 x 28
3/64
.0469
I
.2720
5/16 x 24
5/32
.1562
55
.0520
J
.2770
22
.1570
10 x 30
54
.0550
1 x 56
No. 3
K
.2810
21
.1590
10 x 32
53
.0595
1 x 64 - 72
9/32
.2812
5/16 x 24 - 32*
20
.1610
3/16 x 32
1/16
.0625
L
.2900
19
.1660
52
.0635
No. 4
M
.2950
18
.1695
No. 16
51
.0670
19/64
.2969
11/64
.1719
50
.0700
2 x 56 - 64
N
.3020
17
.1730
49
.0730
No. 5
5/16
.3125
3/8 x 16 - 1/8*P
16
.1770
12 x 24
48
.0760
O
.3160
15
.1800
5/64
.0781
P
.3230
14
.1820
12 x 28
47
.0785
3 x 48
No. 6
21/64
.3281
3/8 x 20 - 24
13
.1850
12 x 32
No. 18
46
.0810
Q
.3332
3/16
.1875
45
.0820
3 x 56
R
.3390
12
.1890
44
.0860
4 x 36
No. 7
11/32
.3437
11
.1910
43
.0890
4 x 40
S
.3480
10
.1935
14 x 20
42
.0935
4 x 48
T
.3580
9
.1960
3/32
.0937
23/64
.3594
8
.1990
41
.0960
U
.3680
7
.2010
1/4 x 20
40
.0980
5 x 36
No. 8
3/8
.3750
7/16 x 14
13/64
.2031
39
.0995
V
.3770
6
.2040
38
.1015
5 x 40
W
.3860
5
.2055
37
.1040
5 x 44
No. 9
25/64
.3906
7/16 x 20
4
.2090
1/4 x 24
No. 20
36
.1069
X
.3970
3
.2130
1/4 x 28
7/64
.1094
Y
.4040
7/32
.2187
1/4 x 32
35
.1100
6 x 32
13/32
.4062
2
.2210
34
.1110
6 x 36
Z
.4130
1
.2280
No. 24
33
.1130
6 x 40
No. 10
27/64
.4219
1/2 x 12 - 13
A
.2340
32
.1160
7/16
.4375
1/4" Pipe
15/64
.2344
31
.1200
No. 11
29/64
.4531
1/2 x 20 - 24
B
.2380
1/8
.1250
7 x 36
15/32
.4687
1/2 x 27
C
.2420
30
.1285
8 x 30
No. 12
31/64
.4844
9/16 x 12
D
.2460
29
.1360
8 x 32 x 36
1/2
.5000
1/4
.2500
28
.1405
8 x 40
Self-Tapping Screws
Suggested Hole Sizes
Suggested Hole Sizes
Notes Regarding Hole
For Type A
For Types AB - B - 25
Preparation:
Type A
Type AB
• Preformed holes can be
drilled, cored, punched,
Type 25
Type B
pierced or extruded. If
Closet Drill
edge burrs can cause
Nominal
Size to Mean
Screw
Hole Diameter
Closet Drill
assembly difficulty, they
Size
Drill Size
Hole Diam.
Nominal
Size to Mean
should be removed.
Hole Diameter
Screw
Hole Diameter
6-18
#32
0.1160
Wall ovality and/or
Size
Max
Mean
Min.
Drill Size
Drill Diam.
7-16
#30
0.1285
taper can affect load
8-15
#29
0.1360
2-32
.077
.072
.067
49
.073
carrying abillity
10-12
#21
0.1590
3-28
.090
.084
.078
45
.082
12-11
3/16
0.1875
4-24
.103
.096
.089
41
.096
14-10
5.5 mm
0.2165
5-20
.114
.107
.100
36
.1056
• “Minimum torsional
20-9
L
0.2900
6-20
.124
.116
.108
32
.116
strength” is the torque
24-9
11/32
0.3438
7-19
.138
.129
.120
30
.1285
that free standing
8-18
.148
.138
.128
29
.136
screws must accept
10-16
.170
.159
.148
21
.159
without evidence of
12-14
.194
.182
.169
14
.182
damage or failure
1/4-14
.226
.211
.196
4
.209
5/16-12
.289
.270
.251
I
.272
3/8-12
.356
.333
.310
Q
.332
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