Inch Series Socket Head Shoulder Screws

Engineering Hardware Guide

Inch Series Socket Head Shoulder Screws size chart per. ASME B18.3 size and engineering date table chart.

Shoulder Screw

Shoulder screw deatails‚Äč

Applicable Standards: ASME B18.3.
Tensile Strength: 140,000psi min.,
Yield Strength 120,000 psi min.
Hardness: RC 32 minimum.

Nominal
Shoulder
Diameter

D(1)
Shoulder
Diameter
Max. - Min.

 

A
Head
Diameter
Max. Min.

H
Head
Side
Height
Max. Min.

S
Head Height
Min.

J
Hex
Socket
Size
Nominal

T
Key
Engagement
Min.

E(3)
Thread
Length
Basic

1/4

0.2480 - 0.2460

0.375 0.357

0.188 0.177

0.157

1/8

0.094

0.375

5/16

0.3105 - 0.3085

0.438 0.419

0.219 0.209

0.183

5/32

0.117

0.438

3/8

0.3730 0.3710

0.562 0.543

0.250 0.240

0.209

3/16

0.141

0.500

1/2

0.4980 0.4960

0.750 0.729

0.312 0.302

0.262

1/4

0.188

0.625

5/8

0.6230 0.6210

0.875 0.853

0.375 0.365

0.315

5/16

0.234

0.750

3/4

0.7480 0.7460

1.000 0.977

0.500 0.490

0.421

3/8

0.281

0.875

1

0.9980 0.9960

1.312 1.287

0.625 0.610

0.527

1/2

0.375

1.000

1 1/4

1.2480 1.2460

1.750 1.723

0.750 0.735

0.633

5/8

0.469

1.125

1 1/2

1.4980 1.4960

2.125 2.095

1.000 0.980

0.842

7/8

0.656

1.500

1 3/4

1.7480 1.7460

2.375 2.345

1.125 1.105

0.948

1

0.750

1.750

2

1.9980 1.9960

2.750 2.270

1.250 1.230

1.054

1 1/4

0.937

2.000

 

Nominal
Shoulder
Diameter

M
Head
Fillet
Ext. Above D
Max. Min.

K
Shoulder
Neck
Diameter
Min.

F
Shoulder
Neck
Width
Max.

Dt
Basic
Thread
Diameter
And Pitch

G
Thread
Neck
Diameter
Max. Min.

I
Thread
Neck
Width
Max.

N
Thread
Neck
Fillet
Max. Min.

1/4

0.014 0.009

0.227

0.093

#10-24

0.142 0.133

0.083

0.023 0.017

5/16

0.017 0.012

0.289

0.093

1/4-20

0.193 0.182

0.100

0.028 0.022

3/8

0.020 0.015

0.352

0.093

5/16-18

0.249 0.237

0.111

0.031 0.025

1/2

0.026 0.020

0.477

0.093

3/8-16

0.034 0.291

0.125

0.035 0.029

5/8

0.032 0.024

0.602

0.093

1/2-13

0.414 0.397

0.154

0.042 0.036

3/4

0.039 0.030

0.727

0.093

5/8-11

0.521 0.502

0.182

0.051 0.045

1

0.050 0.040

0.977

0.125

3/4-10

0.638 0.616

0.200

0.055 0.049

1 1/4

0.060 0.050

1.227

0.125

7/8-9

0.750 0.726

0.222

0.062 0.056

1 1/2

0.070 0.060

1.478

0.125

1 1/8-7

0.964 0.934

0.286

0.072 0.066

1 3/4

0.080 0.070

1.728

0.125

1 1/4-7

1.089 1.059

0.286

0.072 0.066

2

0.090 0.080

1.978

0.125

1 1/2-6

1.307 1.277

0.333

0.102 0.096

Notes:

1. Thread Length Tolerance: -0.020in. for sizes up to 3/8 in., inclusive, and -0.030 for sizes over 3/8 inch.
2. Concentricity: Head shall be concentric with the shoulder within 1 percent (2 percent total runout) of the nominal diameter D or 0.003 inch (0.006 inch total runout), whichever is greater. Concentricity, parallelism, bow and squareness of shoulder to thread shall be within 0.005 inch total runout per inch of shoulder length, with a maximum of 0.025 inch, when firmly seated against the shoulder in a threaded bushing, and checked on the shoulder a distance of 2F from the underside of the head. Threads of bushing shall be basic size, and busing OD and ends shall be concentric and square with the axis.
3. Bearing surface: The plane of the bearing surface of the head shall be perpendicular to the axis of the shoulder within a maximum deviation of 2 degrees.

Standard Lengths

Nominal
Shoulder
(Screw)
Length

Standard
Length
Increment

1/4 through 3/4

1/8

3/4 through 5

1/4

Over 5

1/2

 

Mechanical Properties and Tightening Torques

 

Nominal
Shoulder
Diameter

 

Nominal
Thread
Size

Tensile
Strength
Threads
Pounds Min.

Single
Shear
Strength

 

Hex
Key
Size

 

Tightening
Torque
Inch-Pounds

Pounds Min.
Thread Neck

Shoulder

1/4

10-24

2540

1250

4515

1/8

50

5/16

1/4-20

4610

2340

7100

5/32

125

3/8

5/16-18

7600

3970

10280

3/16

265

1/2

3/8-16

11240

5985

18350

1/4

470

5/8

1/2-13

20570

11140

28785

5/16

1150

3/4

5/8-11

32770

17800

41515

3/8

2000

1

3/4-10

48430

26800

74000

1/2

4000

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