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                                                          Flat Head for Machine Screws                              ANSI/ASME B18.6.3 1972

Nominal Size

Head Dimensions

Slot Dimensions

Recess Dimensions

Protrusion Above Gaging Dia.(P)

Gaging Dia.(G)

Driver Size

Diameter(W)

Height(H)

Width(S)

Depth(D)

Dia.(B)

Depth(T)

Width(C)

Max

Min

Ref

Max

Min

Max

Min

Ref

Ref

Ref

Max

Min

0

.119

.099

.035

.023

.016

.015

.010

.062

.035

.014

.026

.016

.078

0

1

.146

.123

.043

.026

.019

.019

.012

.070

.043

.015

.028

.016

.101

0

2

.172

.147

.051

.031

.023

.023

.015

.095

.055

.017

.029

.017

.124

1

3

.199

.171

.059

.035

.027

.027

.017

.100

.060

.018

.031

.018

.148

1

4

.225

.195

.067

.039

.031

.030

.020

.121

.081

.018

.032

.019

.172

1

5

.252

.220

.075

.043

.035

.034

.022

.147

.074

.027

.034

.020

.196

2

6

.279

.244

.083

.048

.039

.038

.024

.167

.094

.029

.036

.021

.220

2

8

.332

.292

.100

.054

.045

.045

.029

.182

.109

.030

.039

.023

.267

2

10

.385

.340

.116

.060

.050

.053

.034

.197

.124

.032

.042

.025

.313

2

12

.438

.389

.132

.067

.056

.060

.039

.261

.144

.035

.045

.027

.362

3

1/4

.507

.452

.153

.075

.064

.070

.046

.276

.159

.036

.050

.029

.424

3

5/16

.635

.568

.191

.084

.072

.088

.058

.358

.205

.061

.057

.034

.539

4

3/8

.762

.685

.230

.094

.081

.106

.070

.386

.234

.065

.065

.039

.653

4

1/2

.875

.775

.223

.106

.091

.103

.065

.417

.265

.069

.081

.049

.739

4

 

                                                  Flat Head 100 For Machine Screw                             ANSI/ASME B18.6.3 1972

Nominal Size

Head Dimensions

Slot Dimensions

Recess Dimensions

Protrusion Above Gaging Dia.

Gaging Dia.

Driver Size

Diameter

Height

Width

Depth

Dia.

Depth

Width

Max

Min

Ref

Max

Min

Max

Min

Ref

Ref

Ref

Max

Min

0

.119

.096

.026

.023

.016

.013

.008

.054

.027

.012

.020

.012

.074

0

2

.172

.143

.037

.031

.023

.019

.012

.088

.048

.012

.022

.014

.121

1

4

.225

.191

.049

.039

.031

.024

.017

.110

.070

.018

.025

.016

.167

1

6

.279

.238

.060

.048

.039

.030

.022

.147

.074

.027

.028

.017

.214

2

8

.332

.285

.072

.054

.045

.036

.027

.162

.089

.028

.031

.019

.261

2

10

.385

.333

.083

.060

.050

.042

.031

.177

.104

.030

.034

.021

.307

2

1/4

.507

.442

.110

.075

.064

.055

.042

.240

.123

.033

.040

.025

.415

3

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