TRUSS, ROUND and FILLISTER HEAD

Head Dimensions for Truss Head Machine Screws

Nominal
Size

A

H

J

T

M

G

N

Phillips
Driver
Size

Head
Diameter

Head
Height

Slot Width

Slot Depth

Dimensions of Recess

Diameter

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

1

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

Combination Drive Truss Head Machine Screw Head Dimensions

Nominal
Size

A

H

J

T

M

G

N

Recess
Penetration
Gaging Depth

Phillips
Driver
Size

Head
Diameter

Head
Height

Slot Width

Slot Depth

Dimensions of Recess

Diameter

Depth

Width

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Min

Max

Min

4

.257

.241

.069

.059

.039

.031

.040

.030

.112

.099

.069

.051

.018

.062

.044

1

6

.321

.303

.086

.074

.048

.039

.050

.037

.158

.145

.084

.059

.027

.073

.048

2

8

.384

.364

.102

.088

.054

.045

.058

.045

.173

.160

.099

.074

.029

.088

.063

2

10

.448

.425

.118

.103

.060

.050

.068

.053

.188

.175

.115

.090

.030

.104

.079

2

12

.511

.487

.134

.118

.067

.056

.077

.061

.248

.235

.128

.103

.032

.111

.086

3

1/4

.573

.546

.150

.133

.075

.064

.087

.070

.263

.250

.143

.118

.033

.126

.101

3

Head Dimensions for Round Head Machine Screws - ANSI B18.6.3

Nominal
Size

A

H

J

T

M

G

N

Phillips
Driver
Size

Head
Diameter

Height of Head

Slot Width

Slot Depth

Dimensions of Recess

Diameter

Depth

Width

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

2

.162

.146

.069

.059

.031

.023

.048

.037

.100

.087

.053

.017

1

3

.187

.169

.078

.067

.035

.027

.053

.040

.109

.096

.062

.018

1

4

.211

.193

.086

.075

.039

.031

.058

.044

.118

.105

.072

.019

1

5

.236

.217

.095

.083

.043

.035

.063

.047

.154

.141

.074

.027

2

6

.260

.240

.103

.091

.048

.039

.068

.051

.162

.149

.084

.027

2

8

.309

.287

.120

.107

.054

.045

.077

.058

.178

.165

.101

.030

2

10

.359

.334

.137

.123

.060

.050

.087

.065

.195

.182

.119

.031

2

12

.408

.382

.153

.139

.067

.056

.096

.073

.249

.236

.125

.032

3

1/4

.472

.443

.175

.160

.075

.064

.109

.082

.268

.255

.147

.034

3

5/16

.590

.557

.216

.198

.084

.072

.132

.099

.308

.295

.187

.040

3

3/8

.708

.670

.256

.237

.094

.081

.155

.117

.387

.374

.228

.064

4

1/2

.813

.766

.355

.332

.106

.091

.211

.159

.416