Self Drilling Screws

Nominal
Size

Width
Across
Flats

Width
Across
Corners

Height
of
Head

Diameter
of
Washer

Thickness
of
Washer

Width
of
Slot

Depth
of
Slot

Max.

Min.

Max.

Min.

Max.

Min.

Max.

Min.

Max.

Min.

Max.

Min.

4
6
7
8
10
12
14
1/4
5/16
3/8

.187
.250
.250
.250
.312
.312
.438
.375
.500
.562

.181
.244
.244
.244
.305
.305
.428
.367
.489
.551

.202
.272
.272
.272
.340
.340
.409
.409
.545
.614

.060
.093
.093
.110
.120
.155
.190
.190
.230
.295

.049
.080
.080
.096
.105
.139
.172
.172
.208
.270

.243
.328
.328
.348
.414
.432
.520
.520
.676
.780

.225
.302
.302
.322
.384
.398
.480
.480
.624
.720

.019
.025
.029
.031
.031
.039
.050
.050
.055
.063

.011
.015
.017
.019
.019
.022
.030
.030
.035
.037

.039
.048
.048
.054
.060
.067
.075
.075
.084
.094

.031
.039
.039
.045
.050
.056
.064
.064
.072
.081

.042
.053
.062
.074
.080
.103
.111
.111
.134
.168

.025
.033
.040
.052
.057
.077
.083
.083
.100
.131

Nominal
Size

Phillips
Driver
Size

Head Diameter

Height of Head

Width of Slot

Depth of Slot

Dimensions of Recess

Slotted

Recessed

Diameter

Depth

Width

Max.

Min.

Max.

Min.

Max.

Min.

Max.

Min.

Max.

Min.

Max.

Min.

Max.

Min.

2
3
4
5
6
7
8
10
12
1/4
5/16
3/8

.167
.193
.219
.245
.270
.296
.322
.373
.425
.492
.615
.740

.155
.180
.205
.231
.256
.281
.306
.357
.407
.473
.594
.716

.053
.060
.068
.075
.082
.089
.096
.110
.125
.144
.178
.212

.045
.051
.058
.065
.072
.079
.085
.099
.112
.130
.162
.195

.062
.071
.080
.089
.097
.106
.115
.133
.151
.175
.218
.261

.053
.062
.070
.079
.087
.096
.105
.122
.139
.162
.203
.244

.031
.035
.039
.043
.048
.048
.054
.060
.067
.075
.084
.094

.023
.027
.031
.035
.039
.039
.045
.050
.056
.064
.072
.081

.031
.036
.040
.045
.050
.054
.058
.068
.077
.087
.106
.124

.022
.026
.030
.034
.037
.041
.045
.053
.061
.070
.085
.100

.104
.112
.122
.158
.166
.176
.182
.199
.259
.281
.350
.389

.091
.099
.109
.145
.153
.163
.169
.186
.246
.268
.337
.376

.059
.068
.078
.083
.091
.100
.108
.124
.141
.161
.193
.233

.017
.019
.019
.028
.028
.029
.030
.031
.034
.036
.169
.210

1
1
1
2
2
2
2
2
3
3
4
4

Size	A		H		R		I
	Head Diameter		Head Hgt.		Recess Diameter		Recess Depth
	Max.	Min.	Max.	Min.	Max.	Min.	Max	Min.
10	.480	.450	.055	.045	.222	.208	.142	.137

Machine Screws

Nominal Screw Size	O thru l2	1/4 thru 3/4
Nominal Screw Length	Tolerance on Length
Up to 1/2 in., Incl. Over 1/2 to 1 in., Incl. Over 1 to 2 in., Incl. Over 2 in.	-0.02 -0.03 -0.06 -0.09	-0.03 -0.03 -0.06 -0.09

Type A - AB

Nominal Screw Length	Tolerance on Length
Up to 1 in., Incl. Over 1 in.	+ 0.03 + 0.05

Type B, F, H-L 1,
25 and 23

Nominal Screw Length	Tolerance on Length
Up to 3/4 in., Incl. Over 3/4 to 1-1/2 in., Incl.	- 0.03 - 0.05

Type U

Nominal Screw Length	Tolerance on Length
Up to 3/8 in., Incl. Over 3/8 in.	+ 0.02 + 0.03

Wood Screws

Nominal Screw Length	Tolerance on Length
Up to 5/8in., Incl. Over 5/8 to l-1/2 in., Incl. Over l-1/2 to 2-3/4 in., Incl. Over 2-3/4 to 5 in., Incl.	-0.03 -0.05 -0.06 -0.09

Self-Drilling Screws

Nominal
Size or Basic
Screw Diameter

Threads
Per
Inch

Major Diameter

Minor Diameter

Protrusion
Allowance

Max.

Min.

Max.

Min.

#2 Pt.

#3 Pt

0.1380

0.139

0.135

0.104

0.099

0.190

0.1640

0.166

0.161

0.122

0.116

0.211

0.1900

0.189

0.183

0.141

0.135

0.235

0.300

0.2160

0.215

0.209

0.164

0.157

0.353

1/4

0.2500

0.246

0.240

0.192

0.185

0.393