ASME B18.2.2 Heavy Hex Nut Dimensions

Heavy-duty hex nuts manufactured to ASME B18.2.2 standards for structural and industrial applications.

ASME B18.2.2 Heavy Hex Nuts feature increased thickness and width for enhanced load distribution and improved fastening strength. These heavy hex nuts are commonly used in structural steel assemblies, heavy machinery, construction systems, industrial equipment, and demanding high-load fastening environments.

ASME B18.2.2 Heavy Hex Nut Dimensions

Nominal Size

Basic Major Diameter

Width Across Flats, F

Width Across Corners, G

Thickness, H

Maximum Runout of Bearing Surface to Thread Axis, FIM

Basic

Min.

Max.

Min.

Max.

Basic

Min.

Max.

Up to 150k psi

150k psi +

1/4

0.2500

1/2

0.488

0.500

0.556

0.577

15/64

0.218

0.250

0.017

0.011

5/16

0.3125

9/16

0.546

0.562

0.622

0.650

19/64

0.280

0.314

0.020

0.012

3/8

0.3750

11/16

0.669

0.688

0.763

0.794

23/64

0.341

0.377

0.021

0.014

7/16

0.4375

3/4

0.728

0.750

0.830

0.866

27/64

0.403

0.441

0.022

0.015

1/2

0.5000

7/8

0.850

0.875

0.969

1.010

31/64

0.464

0.504

0.023

0.016

9/16

0.5625

15/16

0.909

0.938

1.037

1.083

35/64

0.526

0.568

0.024

0.017

5/8

0.6250

1 1/16

1.031

1.062

1.175

1.227

39/64

0.587

0.631

0.025

0.018

3/4

0.7500

1 1/4

1.212

1.250

1.382

1.443

47/64

0.710

0.758

0.027

0.020

7/8

0.8750

1 7/16

1.394

1.438

1.589

1.660

55/64

0.833

0.885

0.029

0.022

1.0000

1 5/8

1.575

1.625

1.796

1.876

63/64

0.956

1.012

0.031

0.024

1 1/8

1.1250

1 13/16

1.756

1.812

2.002

2.093

1 7/64

1.079

1.139

0.033

0.027

1 1/4

1.2500

1.938

2.000

2.209

2.309

1 7/32

1.187

1.251

0.035

0.030

1 3/8

1.3750

2 3/16

2.119

2.188

2.416

2.526

1 11/32

1.310

1.378

0.038

0.033

1 1/2

1.5000

2 3/8

2.300

2.375

2.622

2.742

1 15/32

1.433

1.505

0.041

0.036

1 5/8

1.6250

2 9/16

2.481

2.562

2.828

2.959

1 19/32

1.556

1.632

0.044

0.038

1 3/4

1.7500

2 3/4

2.662

2.750

3.035

3.175

1 23/32

1.679

1.759

0.048

0.041

1 7/8

1.8750

2 15/16

2.844

2.938

3.242

3.392

1 27/32

1.802

1.886

0.051

0.044

2.0000

3 1/8

3.025

3.125

3.449

3.608

1 31/32

1.925

2.013

0.055

0.047

2 1/4

2.2500

3 1/2

3.388

3.500

3.862

4.041

2 13/64

2.155

2.251

0.061

0.052

2 1/2

2.5000

3 7/8

3.750

3.875

4.275

4.474

2 29/64

2.401

2.505

0.068

0.058

2 3/4

2.7500

4 1/4

4.112

4.250

4.688

4.907

2 45/64

2.647

2.759

0.074

0.064

3.0000

4 5/8

4.475

4.625

5.102

5.340

2 61/64

2.893

3.013

0.081

0.070

3 1/4

3.2500

4.838

5.000

5.515

5.774

3 3/16

3.124

3.252

0.087

0.075

3 1/2

3.5000

5 3/8

5.200

5.375

5.928

6.207

3 7/16

3.370

3.506

0.094

0.081

3 3/4

3.7500

5 3/4

5.562

5.750

6.341

6.640

3 11/16

3.616

3.760

0.100

0.087

4.0000

6 1/8

5.925

6.125

6.755

7.073

3 15/16

3.862

4.014

0.107

0.093

Frequently Asked Questions

What grades of nonferrous metal does ASTM F467 cover for heavy hex nuts?

ASTM F467 covers copper (C11000), brass (C26000, C27000, C46200, C46400), bronze (C51000 phosphor, C61300/C61400/C63000 aluminum, C64200, C65100/C65500/C66100 silicon, C67500 manganese), cupro-nickel (C71000, C71500), nickel-base alloys (N04400 Monel 400, N04405, N05500 Monel K-500, N06059 Alloy 59, N06625 Inconel 625, N06686, N10001 Hastelloy B-2, N10276 Hastelloy C-276), aluminum (A92024, A96061, A97075), and titanium grades - all available for this nut family at TorqBolt.

What is the dimensional standard for these heavy hex nuts?

This product follows ASME B18.2 2, the dimensional standard for heavy hex nuts. Material chemistry, mechanical properties, and acceptance criteria follow ASTM F467 / F467M for nonferrous bolting. TorqBolt supplies both inch-series and metric sizes per the applicable ASME or ISO drawing.

Which F467 grades are best for marine and seawater service?

For seawater bolting per F467: Monel 400 (N04400) and Monel K-500 (N05500) resist chloride stress-corrosion cracking and HF acid; nickel-aluminum bronze C63000 is the standard high-strength marine fastener; cupro-nickel C71500 is preferred for condenser tube-sheet bolting; naval brass C46400 is the lower-cost option for routine marine hardware; titanium Grade 2 (R50400) is the premium choice for severe chloride + chemical service.

Are F467 heavy hex nuts NACE MR0175 acceptable for sour service?

Most F467 nickel and titanium grades are NACE MR0175 / ISO 15156-listed: Monel 400 (N04400), Monel K-500 (N05500) conditional, Inconel 625 (N06625), Hastelloy B-2 (N10001), Hastelloy C-276 (N10276), Alloy 59 (N06059), Alloy 686 (N06686), and all titanium grades (R50400, R52400, R56400, R56401). Aluminum bronzes are generally not preferred for sour service. TorqBolt provides NACE-compliant heat-treat and hardness reports on request.

References & Standards

ASTM F467 / F467M - Standard Specification for Nonferrous Nuts for General Use

ASTM F468 / F468M - Companion specification for Nonferrous Bolts, Hex Cap Screws, and Studs (mate with F467 nuts for matched-alloy assemblies)

ASTM F436 / F436M - Hardened steel washers (ferrous washer companion when nonferrous washers are not specified)

NACE MR0175 / ISO 15156 - Sour-service hardness limits for petroleum and natural gas industries

ASME B18.2.2 / B18.2.4.1M / B18.2.4.6M and ISO 4032 / 4033 / 4035 - Dimensional standards referenced by F467

DIN 934 / 439 / 6330 - Metric hex nut dimensional standards

Related Specifications

Surface Treatments

Xylan 1070 / 1014 / 1400 / 1424

Xylar 2 / 101

Geomet 321 / 500 / 720

SermaGard 1105 / 1280

Dacromet 320 / 500

TakeCoat 1000 Ceramic

Delta Tone/Seal

Magnigard

MolyKote

Sherardized

Zinc-Cobalt (ASTM B840)

Zinc-Nickel (ASTM B841)

Certifications

ISO 9001 - 2015 Certified
PED 2014/68/EC
NACE MR0175/ISO 15156-2
NORSOK M-650
DFAR
MERKBLATT AD 2000 W2/W7/W10

ASME B18.2.2 Heavy Hex Nut Dimensions