Home Technical AB Hole Sizes
Feb 07
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RECOMMENDED DRILL SIZES

Type AB & B

Self-Tapping Screw Size

Major Thread Diameter

Minor Thread Diameter

For Heavy Metals

For Light Metals
No.
Threads per Inch
Basic screw Diameter
Max.
Min.
Max.
Min.
Drill Size
Drill Size
2
32
.086
.088
.082
.064
.060
49
.0730
49
.0730
4
24
.112
.114
.108
.086
.082
41
.0960
41
.0960
5
20
.125
.130
 .123
 
.094
.090
36
.1065
36
.1065
6
20
.138
.139
.132
.104
.099
32
.1160
32
.1160
7
19
.151
.154
.147
.115
.109
30
.1285
30
.1285
8
18
.164
.166
.159
.122
.116
28
.1405
29
.1360
10
16
.190
.189
.182
.141
.135
20
.1610
21
.1590
12
14
.216
.215
.208
.164
.157
13
.1850
14
.1820
1/4
14
.250
.246
.237
.192
.185
3
.2130
4
.2090
5/16
12
.313
.315
.306
.244
.236
I
.2720
H
.2660
3/8
12
.375
.380
.371
.309
.299
R
.3390
Q
.3320

Type AB point: A thread forming screw combining locating point of Type A with thread size and pitch of Type B. Normal limitations of type B apply.

Type B point: A thread forming screw for use in heavier metal .050 to .200 thick. Larger root diameter with finer thread pitch for light and heavy sheet metal non-ferrous castings, plastics, impregnated plywood, asbestos combinations, and other materials.

 
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