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                       Slotted Head Undercut for Machine Screws                         ANSI/ASME B18.6.3

Nominal Size

Head Dimensions

Slot Dimensions

Dimensions of Undercut

Diameter(A)

Height of Head

Width(J)

Depth(T)

Dia.(U)

Depth(X)

Height of Oval(f)

Total Height(O)

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

2

.181

.171

.018

.013

.050

.043

.031

.023

.030

.020

.141

.124

.010

.005

3

.208

.197

.022

.016

.059

.052

.035

.027

.036

.025

.162

.143

.011

.006

4

.235

.223

.025

.018

.068

.061

.039

.031

.042

.030

.184

.161

.012

.007

5

.263

.249

.029

.021

.078

.069

.043

.035

.048

.035

.205

.180

.014

.009

6

.290

.275

.032

.024

.087

.078

.048

.039

.053

.040

.226

.199

.015

.010

8

.344

.326

.039

.029

.105

.095

.054

.045

.065

.050

.269

.236

.017

.012

10

.399

.378

.045

.034

.123

.112

.060

.050

.077

.060

.312

.274

.020

.015

12

.454

.430

.052

.039

.141

.130

.067

.056

.089

.070

.354

.311

.023

.018

1/4

.525

.498

.061

.046

.165

.152

.075

.064

.105

.084

.410

.360

.026

.021

  

                         Truss Heads for Machine Screws                                ANSI/ASME B18.6.3

Nominal Size

Head Dimensions

Slot Dimensions

Recess Dimensions

Driver Size

Diameter(A)

Height(H)

Width(J)

Depth(T)

Dia.(M)

Depth(G)

Width(N)

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
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