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ASME/ANSI B18.9:2007 Countersunk Square Neck Bolt

ASME/ANSI B18.9:2007 Countersunk Square Neck Bolt is suitable for inch-series joints that require a flush surface and anti-rotation support. The countersunk head reduces exposed height, while the square neck provides mechanical locking during installation.

This bolt is commonly used in wood structures, vehicle panels, steps, rail accessories, and assemblies requiring one-side fastening. The countersunk appearance is neat and less likely to snag, making it useful for areas requiring surface flatness and contact safety.

Countersink form, square-neck size, thread series, and grip length should be confirmed. For outdoor, vehicle, or humid environments, higher-grade coatings or corrosion-protection treatments can help maintain long-term stability.

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PREV：DIN 608:2010 Short Square Neck Countersunk Bolt NEXT：DIN 604:2017 Countersunk Nib Bolt

Unit: inch

Nominal diameter d

dk(max)

dk(min)

k(max)

k(min)

s(max)

s(min)

ds(max)

ds(min)

Thicken

5/16

0.605

0.563

0.269

0.243

0.325

0.313

0.312

0.299

3/8

0.708

0.656

0.312

0.281

0.387

0.375

0.375

0.36

7/16

0.826

0.766

0.364

0.328

0.45

0.438

0.438

0.421

1/2

0.945

0.875

0.417

0.375

0.515

0.5

0.5

0.483

9/16

1.045

0.969

0.461

0.416

0.578

0.563

0.592

0.544

5/8

1.147

1.063

0.506

0.456

0.64

0.625

0.657

0.606

3/4

1.303

1.219

0.541

0.491

0.765

0.75

0.782

0.729

7/8

1.512

1.406

0.626

0.563

0.906

0.875

0.938

0.853

1

1.7

1.594

0.69

0.627

1.031

1

1.062

0.976

Standard

5/16

0.556

0.516

0.232

0.212

0.325

0.313

0.312

0.299

3/8

0.659

0.609

0.272

0.247

0.387

0.375

0.375

0.36

7/16

0.779

0.719

0.324

0.294

0.45

0.438

0.438

0.421

1/2

0.898

0.828

0.375

0.34

0.515

0.5

0.5

0.483

9/16

1.002

0.922

0.423

0.383

0.578

0.563

0.592

0.544

5/8

1.096

1.016

0.458

0.418

0.64

0.625

0.657

0.606

3/4

1.252

1.172

0.493

0.453

0.765

0.75

0.782

0.729

7/8

1.465

1.359

0.573

0.523

0.906

0.875

0.938

0.853

1

1.653

1.547

0.637

0.587

1.031

1

1.062

0.976

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