Home
About Us
Product
News
Knowledge
Contact Us

     Feedback

ASTM A307 ASME B18.2.1 Hex Bolts-NINGBO BOLT

 

ASTM A307 Bolts Specification

 

ASTM A307 Metric Hex Bolts

 

 

 

 

 

Dimensions for ASME B18.2.1 Standard Hex Bolts

Nominal Size or Basic product Diameter

Full-Size Body Diameter, E

Width Across Flats, F

Width Across Corners, G

Head Height, H

Radius of Fillet, R

Thread Length for Bolt Lengths, LT

6 in. & Shorter

Over 6 in.

Max.

Min.

Max.

Min.

Max.

Min.

Max.

Min.

Max.

Min.

Nom.

Nom.

1/4

0.2500

0.260

0.237

0.438

0.425

0.505

0.484

0.188

0.150

0.03

0.01

0.750

1.000

5/16

0.3125

0.324

0.298

0.500

0.484

0.577

0.552

0.235

0.195

0.03

0.01

0.875

1.125

3/8

0.3750

0.388

0.360

0.562

0.544

0.650

0.620

0.268

0.226

0.03

0.01

1.000

1.250

7/16

0.4375

0.452

0.421

0.625

0.603

0.722

0.687

0.316

0.272

0.03

0.01

1.125

1.375

1/2

0.5000

0.515

0.482

0.750

0.725

0.866

0.826

0.364

0.302

0.03

0.01

1.250

1.500

5/8

0.6250

0.642

0.605

0.938

0.906

1.083

1.033

0.444

0.378

0.06

0.02

1.500

1.750

3/4

0.7500

0.768

0.729

1.125

1.088

1.299

1.240

0.524

0.455

0.06

0.02

1.750

2.000

7/8

0.8750

0.895

0.852

1.312

1.269

1.516

1.447

0.604

0.531

0.06

0.02

2.000

2.250

1

1.0000

1.022

0.976

1.500

1.450

1.732

1.653

0.700

0.591

0.09

0.03

2.250

2.500

1 1/8

1.1250

1.149

1.098

1.688

1.631

1.949

1.859

0.780

0.658

0.09

0.03

2.500

2.750

1 1/4

1.2500

1.277

1.223

1.875

1.812

2.165

2.066

0.876

0.749

0.09

0.03

2.750

3.000

1 3/8

1.3750

1.404

1.345

2.062

1.994

2.382

2.273

0.940

0.810

0.09

0.03

3.000

3.250

1 1/2

1.5000

1.531

1.470

2.250

2.175

2.598

2.480

1.036

0.902

0.09

0.03

3.250

3.500

1 5/8

1.6250

1.658

1.591

2.438

2.356

2.815

2.616

1.116

0.978

0.09

0.03

3.500

3.750

1 3/4

1.7500

1.785

1.716

2.625

2.538

3.031

2.893

1.196

1.054

0.12

0.04

3.750

4.000

1 7/8

1.8750

1.912

1.839

2.812

2.719

3.248

3.099

1.276

1.130

0.12

0.04

4.000

4.250

2

2.000

2.039

1.964

3.000

2.9000

3.464

3.306

1.388

1.175

0.12

0.04

4.250

4.500

2 1/4

2.2500

2.305

2.214

3.375

3.262

3.897

3.719

1.548

1.327

0.19

0.06

4.750

5.000

2 1/2

2.5000

2.559

2.461

3.750

3.625

4.330

4.133

1.708

1.479

0.19

0.06

5.250

5.500

2 3/4

2.7500

2.827

2.711

4.125

3.988

4.763

4.546

1.869

1.632

0.19

0.06

5.750

6.000

3

3.000

3.081

2.961

4.500

4.350

5.196

4.959

2.060

1.815

0.19

0.06

6.250

6.500

3 1/4

3.2500

3.335

3.210

4.875

4.712

5.629

5.372

2.251

1.936

0.19

0.06

6.750

7.000

3 1/2

3.5000

3.589

3.461

5.250

5.075

6.062

5.786

2.380

2.057

0.19

0.06

7.250

7.500

3 3/4

3.7500

3.858

3.726

5.625

5.437

6.495

6.198

2.572

2.241

0.19

0.06

7.750

8.000

4

4.000

4.111

3.975

6.000

5.800

6.928

6.612

2.764

2.424

0.19

0.06

8.250

8.500

 

  Newsletter       Categories Contact Us

QR Code

 

 

Bolts

Nuts

Threaded Studs

Washers

 

NINGBO STEEL BOLT CO., LTD

Address:Panjiashan, Xiepu Town,

Zhenhai, Ningbo, China

TEL: 86-574-86231358

FAX: 86-574-86231338

EMAIL: bolt@ningbo-bolt.com

 

 

About us            Product            News            Knowledge            Contact Us            Feedback            Sitemap

Copyright © Ningbo Steel Bolt Co., Ltd      All Rights Reserved