Bolt Diameter

D

F

C

H

Body Diameter

Width Across Flats

Width Across Corners

Height

Max

Basic

Max

Min

Max

Min

Basic

Max

Min

3/8

0.388

9/16

0.562

0.544

0.650

0.620

1/4

0.268

0.226

1/2

0.515

3/4

0.750

0.725

0.866

0.826

11/32

0.364

0.302

5/8

0.642

15/16

0.938

0.906

1.083

1.033

27/64

0.444

0.378

3/4

0.768

1-1/8

1.125

1.088

1.299

1.240

1/2

0.524

0.455

7/8

0.895

1-5/16

1.312

1.269

1.516

1.447

37/64

0.604

0.531

1

1.022

1-1/2

1.500

1.450

1.732

1.653

43/64

0.700

0.591

1-1/8

1.149

1-11/16

1.688

1.631

1.949

1.859

3/4

0.780

0.658

1-1/4

1.277

1-7/8

1.875

1.812

2.165

2.066

27/32

0.876

0.749

1-3/8

1.404

2-1/16

2.062

1.994

2.382

2.273

29/32

0.940

0.810

1-1/2

1.531

2-1/4

2.250

2.175

2.598

2.480

1

1.036

0.902

1-3/4

1.785

2-5/8

2.625

2.538

3.031

2.893

1-5/32

1.196

1.054

2

2.039

3

3.000

2.900

3.464

3.306

1-11/32

1.388

1.175

2-1/4

2.305

3-3/8

3.375

3.262

3.897

3.719

1-1/2

1.548

1.327

2-1/2

2.559

3-3/4

3.750

3.625

4.330

4.133

1-21/32

1.708

1.479

STANDARD THREAD LENGTH
 

Bolt lengths ?ܠ6??
Bolt lengths > 6??

Thread length = (2 X diameter) + 1/4?? Thread length = (2 X diameter) + 1/2??

MANUFACTURING

Ningbo Dongxin manufactures hex bolts from 3/8?? diameter through 2-1/2?? diameter in most ASTM, and SAE specifications.   Special tooling can be created to produce nonstandard head dimensions or bolt heads with your company??s name and/or logo.
 

Note

Hex bolts (six sided heads) are the industry standard for fasteners with forged heads.  ASTM A307 grade A bolts, all SAE bolts, and several other common specifications require a standard (finished) hex head.  For specifications such as A307 grade B, A325 and A490 that require a heavy hex head, refer to dimensional tolerances for Heavy Hex Bolts or Heavy Hex Structural Bolts.