Nominal Size or Basic Screw Diameter

Hexagon Socket Size(J)

Min Key Engagement to Develop Functional Capability of Key(T)

Cup and Flat Point Dia(C)

Oval Point Radius(R)

Cone Point Angle 90 Angle deg ±2 deg for These Nominal Lengths or Longer; 118 deg ±2 deg for Shorter Nominal Lengths(Y)

Nom

Hex Socket Min

Max

Min

Basic

6

.1380

1/16

.062

.080

.074

.064

.104

.19

8

.1640

5/64

.078

.090

.087

.076

.123

.25

10

.1900

3/32

.094

.100

.102

.088

.142

.25

1/4

.2500

1/8

.125

.125

.132

.118

.188

.31

5/16

.3125

5/32

.156

.156

.172

.156

.234

.38

3/8

.3750

3/16

.188

.188

.212

.194

.281

.44

7/16

.4375

7/32

.219

.219

.252

.232

.328

.50

1/2

.5000

1/4

.250

.250

.291

.270

.375

.57

5/8

.6250

5/16

.312

.312

.371

.347

.469

.75

3/4

.7500

3/8

.375

.375

.450

.425

.562

.88

7/8

.8750

1/2

.500

.500

.530

.502

.656

1.00

1

1.000

9/16

.562

.562

.609

.579

.750

1.13

1-1/8

1.125

9/16

.562

.562

.689

.655

.844

1.25

1-1/4

1.250

5/8

.625

.625

.767

.733

.938

1.50

1-3/8

1.375

5/8

.625

.625

.848

.808

1.031

1.63

1-1/2

1.500

3/4

.750

.750

.926

.886

1.125

1.75

1-3/4

1.750

1

1.000

1.000

1.086

1.039

1.312

2.00

2

2.000

1

1.000

1.000

1.244

1.193

1.500

2.25