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ASTM A320 Threaded Rods-NINGBO BOLT

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ASTM A320 Rods Specification

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ASTM A320M Metric Threaded Rods

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ASTM A320 Threaded Rods

D - the nominal diameter of the thread

Coarse Thread Series¡ªUNC

Fine Thread Series¡ªUNF

8-Thread Series¡ª8UN

Nominal Size and Threads Per In.

Basic Pitch Dia.

Section at Minor Dia.

Tensile Stress Area

Nominal Size and Threads Per In.

Basic Pitch Dia.

Section at Minor Dia.

Tensile Stress Area

Nominal Size and Threads Per In.

Basic Pitch Dia.

Section at Minor Dia.

Tensile Stress Area

In.

Sq in.

Sq in.

In.

Sq in.

Sq in.

In.

Sq in.

Sq in.

1/4 - 20

0.2175

0.0269

0.0318

1/4 - 28

0.2268

0.0326

0.0364

¨C ¨C

¨C

¨C

¨C

5/16 - 18

0.2764

0.0454

0.0524

5/16 - 24

0.2854

0.0524

0.0580

¨C ¨C

¨C

¨C

¨C

3/8 - 16

0.3344

0.0678

0.0775

3/8 - 24

0.3479

0.0809

0.0878

¨C ¨C

¨C

¨C

¨C

7/16 - 14

0.3911

0.0933

0.1063

7/16 - 20

0.4050

0.1090

0.1187

¨C ¨C

¨C

¨C

¨C

1/2 - 13

0.4500

0.1257

0.1419

1/2 - 20

0.4675

0.1486

0.1599

¨C ¨C

¨C

¨C

¨C

9/16 - 12

0.5084

0.162

0.182

9/16 - 18

0.5264

0.189

0.203

¨C ¨C

¨C

¨C

¨C

5/8 - 11

0.5660

0.202

0.226

5/8 - 18

0.5889

0.240

0.256

¨C ¨C

¨C

¨C

¨C

3/4 - 10

0.6850

0.302

0.334

3/4 - 16

0.7094

0.351

0.373

¨C ¨C

¨C

¨C

¨C

7/8 - 9

0.8028

0.419

0.462

7/8 - 14

0.8286

0.180

0.509

¨C ¨C

¨C

¨C

¨C

1 - 8

0.9188

0.551

0.606

1 - 12

0.9459

0.625

0.663

1 - 8

0.9188

0.551

0.606

1 1/8 - 7

1.0322

0.693

0.763

1 1/8 - 12

1.0709

0.812

0.856

1 1/8 - 8

1.0438

0.728

0.790

1 1/4 - 7

1.1572

0.890

0.969

1 1/4 - 12

1.1959

1.024

1.073

1 1/4 - 8

1.1688

0.929

1.000

1 3/8 - 6

1.2667

1.054

1.155

1 3/8 - 12

1.3209

1.260

1.315

1 3/8 - 8

1.2938

1.155

1.233

1 1/2 - 6

1.3917

1.294

1.405

1 1/2 - 12

1.4459

1.521

1.581

1 1/2 - 8

1.4188

1.405

1.492

¨C ¨C

¨C

¨C

¨C

¨C ¨C

¨C

¨C

¨C

1 5/8 - 8

1.5438

1.68

1.78

1 3/4 - 5

1.6201

1.74

1.90

¨C ¨C

¨C

¨C

¨C

1 3/4 - 8

1.6688

1.98

2.08

¨C ¨C

¨C

¨C

¨C

¨C ¨C

¨C

¨C

¨C

1 7/8 - 8

1.7938

2.30

2.41

2 - 4.5

1.8557

2.30

2.50

¨C ¨C

¨C

¨C

¨C

2 - 8

1.9188

2.65

2.77

2 1/4 - 4.5

2.1057

3.02

3.25

¨C ¨C

¨C

¨C

¨C

2 1/4 - 8

2.1688

3.42

3.56

2 1/2 - 4

2.3376

3.72

4.00

¨C ¨C

¨C

¨C

¨C

2 1/2 - 8

2.4188

4.29

4.44

2 3/4 - 4

2.5876

4.62

4.93

¨C ¨C

¨C

¨C

¨C

2 3/4 - 8

2.6688

5.26

5.43

3 - 4

2.8376

5.62

5.97

¨C ¨C

¨C

¨C

¨C

3 - 8

2.9188

6.32

6.51

3 1/4 - 4

3.0876

6.72

7.10

¨C ¨C

¨C

¨C

¨C

3 1/4 - 8

3.1688

7.49

7.69

3 1/2 - 4

3.3376

7.92

8.33

¨C ¨C

¨C

¨C

¨C

3 1/2 - 8

3.4188

8.75

8.96

3 3/4 - 4

3.5876

9.21

9.66

¨C ¨C

¨C

¨C

¨C

3 3/4 - 8

3.6688

10.11

10.34

4 - 4

3.8376

10.61

11.08

¨C ¨C

¨C

¨C

¨C

4 - 8

3.9188

11.57

11.81

 

 

The thread pitch is the distance, measured parallel to its axis, between corresponding points on adjacent surfaces, in the same axial plane.

The major diameter of a thread is the distance that touches the crest of an external thread.

The minor diameter (root diameter) is the diameter of a cylinder that just touches the roots of an external thread.

The crest of a thread is the top portion of a thread.

The root is the lowest groove between the two flanks of the thread.

The flanks of a thread are the sides that connect the crest and the root.

The angle of a thread is the angle between the flanks, measured in an axial plane section.

The thread run-out describes the end of the threaded portion which is not cut or rolled to the full depth and provides a transition to bolt shank.

 

Dimensions of Threaded rods

Screw Size

Class

Major Diameter

Pitch Diameter

Minor Diameter

Diameter

Thread

Max.

Min.

Max.

Min.

Max.

1/4-20

2A

0.2489

0.2408

0.2164

0.2127

0.1876

1/4-28

2A

0.2490

0.2425

0.2258

0.2225

0.2052

5/16-18

2A

0.3113

0.3026

0.2752

0.2712

0.2431

5/16-24

2A

0.3114

0.3042

0.2843

0.2806

0.2603

3/8-16

2A

0.3737

0.3643

0.3331

0.3287

0.2970

3/8-24

2A

0.3739

0.3667

0.3468

0.3430

0.3228

7/16-14

2A

0.4361

0.4258

0.3897

0.3850

0.3485

7/16-20

2A

0.4362

0.4281

0.4037

0.3995

0.3749

1/2-13

2A

0.4985

0.4876

0.4485

0.4435

0.4041

1/2-20

2A

0.4987

0.4906

0.4662

0.4619

0.4374

9/16-12

2A

0.5609

0.5495

0.5068

0.5016

0.4617

9/16-14

2A

0.5510

0.5507

0.5146

0.5096

0.4760

9/16-16

2A

0.5611

0.5517

0.5205

0.5158

0.4866

9/16-18

2A

0.5611

0.5524

0.5250

0.5205

0.4950

9/16-20

2A

0.5612

0.5531

0.5287

0.5245

0.5017

9/16-24

2A

0.5613

0.5541

0.5342

0.5303

0.5117

9/16-32

2A

0.5615

0.5555

0.5412

0.5377

0.5243

5/8-11

2A

0.6234

0.6113

0.5644

0.5589

0.5119

5/8-18

2A

0.6236

0.6149

0.5875

0.5828

0.5554

3/4-10

2A

0.7482

0.7353

0.6832

0.6773

0.6255

3/4-16

2A

0.7485

0.7391

0.7079

0.7029

0.6718

7/8 -9

2A

0.8731

0.8592

0.8009

0.7946

0.7368

7/8-14

2A

0.8734

0.8631

0.8270

0.8216

0.7858

1 -8

2A

0.9980

0.9830

0.9168

0.9100

0.8446

1 -12

2A

0.9982

0.9868

0.9441

0.9382

0.8960

1 1/8-7

2A

1.1228

1.1064

1.0300

1.0228

0.9475

1 1/8-8

2A

1.1229

1.1079

1.0417

1.0348

0.9741

1 1/8-12

2A

1.1232

1.1118

1.0691

1.0631

1.0210

1 1/4-7

2A

1.2478

1.2314

1.1550

1.1476

1.0725

1 1/4-8

2A

1.2479

1.2329

1.1667

1.1597

1.0991

1 1/4-12

2A

1.2482

1.2368

1.1941

1.1879

1.1460

1 3/8-6

2A

1.3726

1.3544

1.2643

1.2563

1.1681

1 3/8-8

2A

1.3728

1.3578

1.2916

1.2844

1.2240

1 3/8-12

2A

1.3731

1.3617

1.3190

1.3127

1.2709

1 1/2-6

2A

1.4976

1.4794

1.3893

1.3812

1.2931

1 1/2-8

2A

1.4978

1.4828

1.4166

1.4093

1.3490

1 1/2-12

2A

1.4981

1.4867

1.4440

1.4376

1.3959

1 3/4-5

2A

1.7473

1.7268

1.6174

1.6085

1.5019

1 3/4-8

2A

1.7477

1.7327

1.6665

1.6590

1.5989

1 7/8-8

2A

1.8727

1.8577

1.7915

1.7838

1.7239

2-4.5

2A

1.9971

1.9751

1.8528

1.8433

1.7324

2-8

2A

1.9977

1.9827

1.9165

1.9087

1.8439

2 1/4-4.5

2A

2.2471

2.2251

2.1028

2.0931

1.9824

2 1/4-8

2A

2.2476

2.2326

2.1664

2.1584

2.0988

2 1/2-4

2A

2.4969

2.4731

2.3345

2.3241

2.1992

2 1/2-8

2A

2.4976

2.4826

2.4164

2.4082

2.3488

2 3/4-4

2A

2.7468

2.7230

2.5844

2.5739

2.4491

2 3/4-8

2A

2.7475

2.7325

2.6663

2.6580

2.5987

3-4

2A

2.9968

2.9730

2.8344

2.8237

2.6991

3-8

2A

2.9974

2.9824

2.9162

2.9077

2.8486

3 1/4-4

2A

3.2467

3.2229

3.0843

3.0734

2.9490

3 1/4-8

2A

3.2474

3.2324

3.1662

3.1575

3.0986

3 1/2-4

2A

3.4967

3.4729

3.3343

3.3233

3.1990

3 1/2-8

2A

3.4974

3.4824

3.4162

3.4074

3.3486

3 3/4-4

2A

3.7466

3.7228

3.5842

3.5730

3.4489

3 3/4-8

2A

3.7473

3.7323

3.6661

3.6571

3.5985

4-4

2A

3.9966

3.9728

3.8342

3.8229

3.6989

4-8

2A

3.9973

3.9823

3.9161

3.9070

3.8485

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