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Pilot Hole Sizes for Steel Sheet Metal

ANSI Hardware Design and Application Guide
ISO Metric Hardware Engineering and Design Data
Fastener and Screw / Bolt Design, Formula & Calculations

Approximate Pilot Hole Sizes for Type A Steel Sheet Metal Thread Forming Screws

Steel, Stainless Steel, Monel Metal, Brass, and Aluminum Sheet Metal
Screw
Size
Metal
Thickness
Hole Size
Drill
Size
Pierced or
Extruded
Drilled or
Clean Punched
4
0.015
…
0.086
44
0.018
…
0.086
44
0.024
0.098
0.094
42
0.030
0.098
0.094
42
0.036
0.098
0.098
40
6
0.015
…
0.104
37
0.018
…
0.104
37
0.024
0.111
0.104
37
0.030
0.111
0.104
37
0.036
0.111
0.106
36
7
0.015
…
0.116
32
0.018
…
0.116
32
0.024
0.120
0.116
32
0.030
0.120
0.116
32
0.036
0.120
0.116
32
0.048
0.120
0.120
31
8
0.018
…
0.125
1⁄8
0.024
0.136
0.125
1⁄8
0.030
0.136
0.125
1⁄8
0.036
0.136
0.125
1⁄8
0.048
0.136
0.128
30

 

Steel, Stainless Steel, Monel Metal, Brass, and Aluminum Sheet Metal
Screw
Size
Metal
Thickness
Hole Size
Drill Size
Pierced or
Extruded
Drilled or
Clean Punched
10
0.018
…
0.136
29
0.024
0.157
0.136
29
0.030
0.157
0.136
29
0.036
0.157
0.136
29
0.048
0.157
0.149
25
12
0.024
…
0.161
20
0.030
0.185
0.161
20
0.036
0.185
0.161
20
0.048
0.185
0.161
20
14
0.024
…
0.185
13
0.030
0.209
0.189
12
0.036
0.209
0.191
11
0.048
0.209
0.196
9

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