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                         Truss Heads                                       ANSI/ASME B18.6.3

Nominal Size

Head Dimensions

Slot Dimensions

Recess Dimensions

Driver Size

Diameter

Height

Width

Depth

Dia.

Depth

Width

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Min

2

.194

.180

.053

.044

.031

.023

.031

.022

.104

.091

.059

.041

.018

1

3

.226

.211

.061

.051

.035

.027

.036

.026

.110

.097

.066

.049

.018

1

4

.257

.241

.069

.059

.039

.031

.040

.030

.112

.099

.069

.051

.018

1

5

.289

.272

.078

.066

.043

.035

.045

.034

.128

.115

.085

.067

.019

2

6

.321

.303

.086

.074

.048

.039

.050

.037

.158

.145

.084

.059

.027

2

8

.384

.364

.102

.088

.054

.045

.058

.045

.173

.160

.099

.074

.029

2

10

.448

.425

.118

.103

.060

.050

.068

.053

.188

.175

.115

.090

.030

2

12

.511

.487

.134

.118

.067

.056

.077

.061

.248

.235

.128

.103

.032

3

1/4

.573

.546

.150

.133

.075

.064

.087

.070

.263

.250

.143

.118

.033

3

5/16

.698

.666

.183

.162

.084

.072

.106

.085

.352

.339

.193

.168

.059

4

3/8

.823

.787

.215

.191

.094

.081

.124

.100

.383

.370

.226

.202

.063

4