Heavy Hex Nut Sizes: Complete Guide for Structural & EPC Buyers

Selecting the correct Heavy Hex Nut Sizes requires more than choosing a diameter such as 1/2″, 3/4″, 1″ or M20.

For structural steel, EPC, PEB, bridges and infrastructure projects, a complete heavy hex nut specification may need:

Diameter → Thread → Dimensional Standard → Nut Grade → Material → Mechanical Properties → Mating Bolt/Stud → Finish → Testing → Documentation

A heavy hex nut can have the correct nominal thread and still be unsuitable if the wrong grade, thread series, coating or mechanical specification is selected.

Quick Answer: What Are Heavy Hex Nut Sizes?

Heavy Hex Nut Sizes are defined by the nominal internal thread together with the dimensional requirements of the applicable heavy-hex standard. Important characteristics include thread diameter, pitch or threads per inch, width across flats, nut height, width across corners and bearing geometry. Nut grade and material must be specified separately.

This distinction is essential:

Size defines geometry and thread. Grade defines mechanical/material requirements.

What Is a Heavy Hex Nut?

A heavy hex nut is a hexagonal nut manufactured to a heavier dimensional pattern than a regular hex nut under the applicable product standard.

The heavy pattern generally provides different:

Width across flats
Nut height
Width across corners
Bearing geometry
Tooling envelope

The exact dimensions must come from the governing standard or approved drawing.

Heavy Hex Nut Does Not Mean “Any Large Nut”

The word heavy has a technical dimensional meaning.

It should not be interpreted simply as:

Large nut
Thick nut
High-strength nut
Heavy-duty nut
Structural nut

Those descriptions can overlap in particular applications, but they are not technically identical.

Heavy Hex Nut Size vs Heavy Hex Nut Grade

This is one of the most important concepts in this guide.

Consider:

3/4″-10 Heavy Hex Nut

This identifies important thread and geometry information.

It does not automatically define:

ASTM grade
Steel chemistry
Heat treatment
Proof load
Hardness
Coating
Mating bolt specification

Likewise:

ASTM A563 Grade DH

does not by itself tell the buyer every required dimension, thread or coating detail.

A complete specification needs both.

Main Heavy Hex Nut Dimensions

Important Heavy Hex Nut Dimensions can include:

Nominal Thread Diameter

The nominal internal thread size that must match the mating bolt or stud.

Thread Pitch or TPI

Metric threads normally identify pitch in millimetres.

Inch threads commonly identify threads per inch.

Width Across Flats

The distance between two opposite flat wrenching surfaces.

Width Across Corners

The maximum dimensional envelope across opposite corners.

Nut Height

The axial height of the nut.

Bearing Surface

The surface transmitting load into the washer or connected component.

Chamfer

The shaped edge at the end of the nut as defined by the applicable standard.

Why Width Across Flats Matters

Heavy hex geometry generally uses a larger wrenching envelope than the corresponding regular hex pattern.

This affects:

Socket size
Wrench selection
Site installation
Structural-steel access
Fabrication clearance
Automated tooling

A designer should therefore check both fastener fit and tool fit.

Why Nut Height Matters

Nut height influences:

Product geometry
Thread engagement
Bolt projection
Tool access
Assembly envelope

However:

Greater nut height does not automatically equal greater allowable joint load.

Mechanical performance comes from the complete specification.

Why Width Across Corners Matters

Width across corners affects the maximum radial envelope of the nut.

This becomes important near:

Structural flanges
stiffeners
channels
equipment walls
anchor plates
adjacent fasteners

A socket also requires additional clearance beyond the nut itself.

Heavy Hex Nut Dimensions Are Standard-Specific

Do not build a drawing using dimensions from an unknown online chart.

Use the current controlled:

ASME standard
ASTM specification
project drawing
customer specification

as applicable.

This is especially important for structural work.

Current ASME Standard for Inch Heavy Hex Nut Dimensions

ASME B18.2.2-2022 is the current ASME dimensional standard relevant to inch-series heavy hex nuts.

It includes dimensional requirements for multiple nut forms, including:

Heavy hex nuts
Heavy hex jam nuts
Heavy hex flat nuts
Other inch-series nut forms

The exact dimensional table should be taken from the controlled standard.

Why We Are Not Reproducing the Full ASME Dimension Table

Engineering buyers need accurate dimensions, but copying an entire controlled standard table into a blog creates two problems:

Standards can be revised.
The official standard should remain the final dimensional authority.

This guide therefore explains how to interpret Heavy Hex Nut Sizes and select the correct specification rather than replacing the controlled ASME document.

Common Inch Heavy Hex Nut Sizes

Depending on the applicable specification and product range, buyers may encounter sizes such as:

1/2″
5/8″
3/4″
7/8″
1″
1-1/8″
1-1/4″
1-3/8″
1-1/2″
1-3/4″
2″
Larger sizes where supported by the applicable specification

The actual permitted size range depends on the governing nut specification.

1/2″ Heavy Hex Nut

A 1/2-inch heavy hex nut specification should also identify:

TPI
thread series
thread class
dimensional standard
nut grade
finish

Do not order only:

1/2″ Heavy Hex Nut.

5/8″ Heavy Hex Nut

For structural or mechanical use, check:

5/8″ Diameter → Thread → Mating Bolt → Nut Specification → Grade → Finish

The mating fastener specification should guide nut selection.

3/4″ Heavy Hex Nut

A common coarse inch thread designation can be:

3/4″-10 UNC

But a complete structural RFQ may still require:

ASTM nut specification
grade
heavy hex dimensional requirement
coating
testing
traceability

7/8″ Heavy Hex Nut

For a 7/8-inch requirement, confirm:

Coarse or fine thread
Mating structural bolt/stud
Nut grade
Plain or coated condition
Project specification

Do not substitute based only on diameter.

1″ Heavy Hex Nut

An inch-series requirement might be written:

1″-8 UNC Heavy Hex Nut

But this does not independently specify:

Mechanical grade
material
finish
project compliance

These must be added separately.

Heavy Hex Nuts Above 1 Inch

As diameter increases, buyers should pay particular attention to:

Available material
manufacturing method
heat treatment
thread quality
proof-load requirements
tooling
coating
inspection

Larger size does not remove the need for grade compatibility.

UNC Heavy Hex Nut Threads

UNC means Unified National Coarse.

A typical designation can be:

3/4″-10 UNC

where:

3/4″ = nominal diameter
10 = threads per inch
UNC = thread series

The thread class should also follow the applicable specification.

UNF Heavy Hex Nut Threads

UNF means Unified National Fine.

For example:

3/4″-16 UNF

is not interchangeable with:

3/4″-10 UNC.

Both have the same nominal diameter but different thread pitches.

Never force one onto the other.

Heavy Hex Nut Size Does Not Define Thread Series

A buyer asking for:

1-inch Heavy Hex Nut

has not fully defined the thread.

The RFQ should identify:

Diameter + TPI + Thread Series + Thread Class where required

Metric Heavy Hex Nut Requirements

Heavy-pattern metric nuts can also be required under applicable specifications or customer drawings.

Metric specification should identify:

M Diameter × Pitch + Dimensional Requirement + Mechanical Requirement + Material + Finish

Example:

M24 × 3.0

defines thread information, but it does not define the complete nut.

Do Not Convert Inch Heavy Hex Nuts Directly to Metric

A 1-inch heavy hex nut should not simply be replaced with an M24 or M25 product because the diameters appear close.

Differences can include:

Thread form
pitch
external dimensions
mechanical properties
product standard
bolt compatibility

Metric and inch systems should be treated independently unless the design formally changes.

Inch vs Metric Heavy Hex Nuts

Feature	Inch System	Metric System
Diameter	Fractional/inch	M designation
Pitch	Threads per inch	Millimetres
Common Thread Terms	UNC / UNF	Coarse / Fine
Dimensions	Applicable inch standard	Applicable metric standard/drawing
Grade	Applicable ASTM/project specification	Applicable specification
Direct Conversion	No	No

Heavy Hex Nut Standards: Understand Their Different Roles

A heavy hex nut can involve several standards.

Dimensional Standard

Controls product geometry.

Example:

ASME B18.2.2

Material/Mechanical Specification

Controls chemistry, grade and mechanical properties.

Example:

ASTM A563/A563M

Service-Specific Nut Specification

Used for particular service conditions.

Example:

ASTM A194/A194M

Coating Standard

Controls the selected surface treatment.

Project Specification

Can impose additional requirements for:

testing
documentation
marking
inspection
approved manufacturers

Do not combine these standards as though they serve the same purpose.

ASTM A563/A563M-26

The active ASTM A563/A563M-26 specification covers carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs and other externally threaded parts.

Its scope includes chemical, mechanical and dimensional requirements for multiple nut grades.

This makes ASTM A563/A563M highly relevant to many structural and mechanical heavy hex nut applications.

Important ASTM A563/A563M Update

For current procurement documents, use:

ASTM A563/A563M-26

where the current edition is required.

Do not automatically copy an older edition from an old supplier datasheet or previous project.

If the project contract explicitly calls for a specific older edition, follow the approved contract requirement unless formally revised.

ASTM A563/A563M Grades

ASTM A563/A563M contains multiple nut grades for different structural/mechanical requirements.

The correct Heavy Hex Nut Grades depend on factors including:

Mating fastener
fastener grade
finish/coating
project specification
mechanical requirements

Do not select a grade simply because it is described as “stronger.”

Stronger Grade Substitution Requires Control

The current ASTM A563/A563M scope permits certain stronger-grade substitutions at the supplier’s option with notice to the purchaser unless the inquiry or purchase order prohibits that substitution.

For project procurement, this means the PO should clearly state when:

No grade substitution is permitted without written approval.

This avoids surprises in EPC documentation.

Weathering Nut Grades

ASTM A563/A563M includes grades with specified atmospheric-corrosion/weathering characteristics.

These are intended for appropriate compatible systems.

Do not assume:

Weathering Nut = Stainless Nut.

They are different material concepts.

Heavy Hex Nut Grade Is Not the Same as Material Name

Terms such as:

Carbon steel
alloy steel
stainless steel

describe broad material families.

A grade specification can add requirements for:

chemistry
heat treatment
hardness
proof load
marking

Therefore, specifying only “alloy steel heavy hex nut” is usually incomplete for a controlled structural project.

ASTM A194/A194M-26

The current ASTM A194/A194M-26 specification covers carbon steel, alloy steel and stainless steel nuts intended for:

High-pressure service
High-temperature service
Or both

Its current scope includes carbon/alloy/martensitic stainless nuts from 1/4″ through 4″ and metric M12 through M100, plus austenitic stainless nuts from 1/4″ and M12 nominal upward.

ASTM A194 Is Not a Generic Heavy Hex Standard

This distinction is critical.

Do not write:

Heavy Hex Nut = ASTM A194.

ASTM A194/A194M is a material/mechanical specification for a particular service family.

Heavy hex is a dimensional form.

A product can meet both requirements when the application calls for both.

ASTM A194 Grade 2H

Grade 2H is one of the best-known heavy hex nut grades in industrial bolting.

But:

Heavy Hex Nut ≠ Automatically Grade 2H

Grade 2H should be specified when required by the mating bolting system, pressure/temperature service specification or project documentation.

ASTM A563 vs ASTM A194

Factor	ASTM A563/A563M	ASTM A194/A194M
Main Direction	General structural/mechanical nuts	High-pressure/high-temperature nuts
Materials	Carbon/alloy steel within scope	Carbon, alloy and stainless grades within scope
Heavy Hex Use	Applicable grades/systems	Applicable grades/systems
Grade Required	Yes	Yes
Interchangeable	No	No
Selection Basis	Bolting/project specification	Service/bolting specification

Do not use this table as a grade substitution chart.

Heavy Hex Nut Grade Selection Starts With the Mating Fastener

A safer engineering sequence is:

Bolt/Stud Specification → Bolt/Stud Grade → Diameter → Thread → Finish → Required Nut Specification → Nut Grade → Heavy Hex Dimensions

This avoids selecting the nut independently from the bolting system.

Structural Bolt Compatibility

For structural connections, the bolt specification may define or guide:

Nut specification
nut grade
nut style
washer requirements
coating compatibility

Always check the current controlled bolting specification.

Why Bolt Grade and Nut Grade Are Different

Bolt and nut standards use different designation systems.

Therefore:

Bolt Grade X does not mean Nut Grade X.

Do not try to match grade names numerically unless the applicable specification explicitly establishes the combination.

Heavy Hex Nut Materials

Depending on the governing standard, project and application, materials can include:

Carbon steel
Alloy steel
Weathering grades
Stainless steel
Other customer-specified materials

Material must support the required mechanical and environmental performance.

Carbon Steel Heavy Hex Nuts

Carbon steel can be used in applicable structural and mechanical grades.

Important controls can include:

Chemistry
mechanical properties
heat treatment where required
coating
thread
proof load
hardness

Do not purchase simply by material family.

Alloy Steel Heavy Hex Nuts

Alloy steel can be used where the applicable grade or service requirement calls for it.

A controlled specification should define:

Chemistry
heat treatment
mechanical properties
testing

The phrase Heavy Duty Nuts does not prove alloy-steel requirements.

Stainless Steel Heavy Hex Nuts

Stainless heavy hex nuts may be required for suitable:

Corrosive environments
process equipment
industrial systems
customer-specific assemblies

Check:

Stainless grade
mechanical properties
mating stud/bolt
galling
temperature
project specification

Do not assume stainless automatically means 316 or A4.

Material vs Coating

These are separate corrosion decisions.

For example:

Carbon Steel + Galvanizing

and:

Stainless Steel

are different material systems.

Do not describe galvanized carbon steel as equivalent to stainless steel.

Heavy Hex Nut Mechanical Properties

Depending on the applicable grade, important requirements can include:

Proof load
hardness
chemical composition
heat-treatment condition
other grade-specific tests

The controlling standard defines the acceptance criteria.

What Is Nut Proof Load?

Proof load is a specified mechanical verification for applicable nuts.

It evaluates the nut under a defined axial loading procedure according to the governing standard.

A compliant nut should satisfy the applicable test criteria.

Proof Load Is Not Safe Working Load

Do not use nut proof load directly as:

allowable structural load
connection capacity
safe working load
anchor capacity

The connection designer must evaluate the complete joint.

Heavy Hex Nut Hardness

Hardness testing can help verify the specified grade.

But hardness alone cannot prove:

Correct chemistry
correct heat treatment
proof-load compliance
correct thread
dimensional compliance

A complete inspection plan is required.

Heat Treatment

Some Heavy Hex Nut Grades require controlled heat treatment.

The manufacturer may need to control:

Heat-treatment batch
furnace process
time/temperature
hardness
mechanical testing
traceability

depending on the governing specification.

Heavy Hex Nut Thread Quality

Thread quality directly affects the mating structural bolt or stud.

Check:

Diameter → Pitch/TPI → Thread Form → Thread Class/Tolerance → Final Coated Condition

The nut must be evaluated in the condition in which it will be supplied and used.

Heavy Hex Nut Thread Inspection

Depending on the applicable specification, inspection can use calibrated:

GO gauges
NO-GO gauges
other specified functional gauges

The gauge system must correspond to the required thread standard.

Plain Heavy Hex Nuts

Plain finish can be appropriate where the approved bolting system requires it.

Possible applications include suitable:

Indoor structures
industrial equipment
protected structural assemblies
project-specific systems

Plain is a surface condition, not a quality grade.

Hot-Dip Galvanized Heavy Hex Nuts

Hot-dip galvanizing is commonly considered for outdoor structural and infrastructure applications where the project specifies it.

However, threaded fasteners require special attention because zinc coating adds thickness.

The bolt and nut must form a compatible thread system after coating.

Why Galvanized Heavy Hex Nut Dimensions Need Care

The external nut geometry may comply with the heavy hex standard, but the internal thread must also account for the coating system on the mating bolt.

This can involve controlled nut-thread processing according to the applicable specification.

Do not use arbitrary thread clearances.

Over-Tapped Galvanized Nuts

For applicable hot-dip galvanized bolting systems, nut threads may require controlled over-tapping to accommodate the coating on the mating bolt.

The exact allowance is specification- and size-dependent.

Therefore:

Never publish or manufacture using one universal over-tap value for all Heavy Hex Nut Sizes.

Plain vs Galvanized Heavy Hex Nut

Factor	Plain	Hot-Dip Galvanized
Coating	None/specified plain condition	Zinc coating
Thread Accommodation	Standard system	Coating-specific control
Corrosion Protection	Environment-dependent	Enhanced where suitable
Friction	System-specific	Different installation behaviour possible
Nut/Bolt Compatibility	Required	Especially critical
Selection	Project-specific	Project-specific

Coating Can Affect Bolting Compatibility

A nut grade or thread arrangement acceptable for a plain bolt may not automatically be the correct choice after galvanizing.

Always recheck the governing bolting specification when finish changes.

Structural Nuts for EPC Projects

EPC projects often require more than dimensional compliance.

Procurement can involve:

Approved standards
approved grades
approved coating
material traceability
mechanical testing
dimensional inspection
ITP
third-party inspection
documentation

The RFQ should define these before pricing.

Heavy Hex Nuts for Structural Steel

For structural steel, identify:

Connection Type → Bolt Specification → Nut Grade → Washer → Coating → Installation Method → Inspection

Do not treat the nut as an independent commodity.

Heavy Hex Nuts for PEB

PEB projects can include:

Primary structural connections
anchor systems
secondary members
equipment attachments

Not every connection requires the same Structural Nuts.

Use the approved structural fastener schedule.

Heavy Hex Nuts for Bridges

Bridge projects may require strict controls for:

Material
grade
corrosion protection
lot traceability
mechanical testing
installation
inspection

Do not advertise one generic heavy hex nut as suitable for every bridge project.

Heavy Hex Nuts for Infrastructure

Infrastructure applications can expose fasteners to:

Weather
moisture
industrial atmosphere
coastal exposure
temperature cycling
long service periods

Material and coating should follow the actual project environment.

Heavy Hex Nuts for Anchor Systems

Heavy hex nuts can be used with suitable anchor rods/bolts when required by the approved anchor specification.

Check:

Anchor rod specification
diameter
thread
nut grade
washer/plate
coating
project requirements

An anchor nut should not be selected from diameter alone.

Heavy Hex Nut vs Standard Hex Nut

Factor	Standard Hex	Heavy Hex
Hex Geometry	Regular pattern	Heavy pattern
Width Across Flats	Standard-specific	Larger pattern under applicable standard
Height	Standard-specific	Heavy-pattern requirement
Tool Envelope	Smaller relative pattern	Larger relative pattern
Structural Use	Where specified	Common in specified structural systems
Grade	Separate requirement	Separate requirement
Automatic Substitution	No	No

Heavy Hex Nut vs Heavy Hex Jam Nut

These are separate product forms.

A jam nut uses reduced height relative to the corresponding full nut family.

Do not substitute a heavy hex jam nut for a full heavy hex nut solely because:

Thread matches
width across flats matches
material appears similar

The joint must be designed for the correct product.

Heavy Hex Nut vs High Hex Nut

These terms should not be treated as synonyms.

Heavy Hex Nut

Usually refers to a heavier hexagonal dimensional pattern under the relevant standard.

High Hex Nut

Typically describes a taller nut style under another product family.

Always use the terminology of the applicable standard.

Heavy Hex Nut vs Structural Nut

A structural nut describes application/specification context.

A heavy hex nut describes product geometry.

A structural bolting specification may require a heavy hex nut, but the two terms do not mean exactly the same thing.

Heavy Hex Nut vs Heavy Duty Nut

“Heavy Duty Nut” is a broad commercial search term.

For engineering procurement, replace it with:

Nut Type + Standard + Grade + Thread + Finish

This gives suppliers a measurable requirement.

Heavy Hex Nut Selection Workflow

Step 1

Identify the application.

Step 2

Identify the mating bolt or stud.

Step 3

Confirm inch or metric system.

Step 4

Confirm nominal diameter.

Step 5

Confirm thread pitch/TPI.

Step 6

Confirm thread class/tolerance.

Step 7

Select the dimensional standard.

Step 8

Select the nut specification.

Step 9

Select the required nut grade.

Step 10

Confirm material and heat treatment.

Step 11

Select finish/coating.

Step 12

Confirm mechanical testing.

Step 13

Confirm marking and traceability.

Step 14

Confirm project documentation.

Heavy Hex Nut RFQ Checklist

Send the supplier:

☐ Application
☐ Project specification
☐ Mating bolt/stud standard
☐ Mating bolt/stud grade
☐ Nominal diameter
☐ Inch or metric
☐ Thread pitch/TPI
☐ Thread series
☐ Thread class/tolerance
☐ Heavy hex dimensional standard
☐ Nut material specification
☐ Nut grade
☐ Mechanical requirements
☐ Heat-treatment requirement
☐ Finish/coating
☐ Washer specification if part of assembly
☐ Marking requirement
☐ Proof-load requirement
☐ Hardness requirement
☐ Material certificate requirement
☐ Dimensional inspection
☐ Thread inspection
☐ Lot/heat traceability
☐ ITP
☐ TPI if required
☐ Quantity
☐ Project demand

Poor Heavy Hex Nut RFQ

Please quote 50,000 pcs heavy-duty nuts, 1 inch, galvanized.

This leaves too many technical questions unanswered.

Better Heavy Hex Nut RFQ

Product: Heavy Hex Nut
Thread: 1″-8 UNC
Application: Structural steel
Mating Bolt: Approved specification attached
Nut Specification/Grade: Project requirement attached
Dimensions: Applicable ASME requirement
Finish: Hot-dip galvanized per project specification
Testing: Mechanical and dimensional as specified
Traceability: Heat/lot required
Documentation: MTC + test reports + DIR
Quantity: 50,000 pcs

What Are Common Heavy Hex Nut Sizes?

Common Heavy Hex Nut Sizes include inch-series sizes such as 1/2″, 5/8″, 3/4″, 7/8″, 1″, 1-1/8″, 1-1/4″, 1-1/2″ and larger sizes where supported by the governing specification. The thread, grade, dimensional standard and finish must also be specified.

What Are Heavy Hex Nut Dimensions?

Important Heavy Hex Nut Dimensions include nominal thread diameter, thread pitch or TPI, width across flats, width across corners, nut height and bearing geometry. Exact dimensions must follow the applicable standard or approved drawing.

What Standard Covers Heavy Hex Nut Dimensions?

ASME B18.2.2-2022 is the current ASME dimensional standard covering inch-series heavy hex nuts and related nut forms. Material and mechanical requirements are controlled separately by the applicable nut specification.

What Is ASTM A563/A563M?

ASTM A563/A563M-26 covers carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs and other externally threaded parts. The correct nut grade must be selected for the intended bolting system.

What Is the Difference Between ASTM A563 and ASTM A194?

ASTM A563/A563M addresses applicable general structural and mechanical nut applications, while ASTM A194/A194M covers nuts intended for high-pressure or high-temperature service, or both. They should not be treated as interchangeable specifications.

Is Every Heavy Hex Nut Grade 2H?

No. Heavy hex describes geometry. Grade 2H is a specific grade under ASTM A194/A194M. It should be specified only when required by the mating bolting system and service specification.

Does Heavy Hex Mean High Strength?

No. Heavy hex identifies a dimensional pattern. Mechanical strength depends on the nut specification, grade, material, heat treatment and required mechanical properties.

Can Heavy Hex Nuts Be Hot-Dip Galvanized?

Yes, where the applicable specification permits it. The bolt coating, nut-thread accommodation and final mating condition must be controlled as a compatible galvanized bolting system.

Buyer Questions Before Ordering Heavy Hex Nuts

Ask:

What is the mating bolt or stud?
Which bolt grade?
Inch or metric?
What diameter?
Which pitch/TPI?
Which thread series?
Which dimensional standard?
Which nut specification?
Which nut grade?
Plain or coated?
Is hot-dip galvanizing required?
What mechanical testing is required?
Is proof-load testing required?
What marking is required?
Is heat/lot traceability required?
Which documents are required?
Is TPI required?

Before approving Heavy Hex Nut Sizes, confirm:

Bolt/Stud + Diameter + Thread + Heavy Hex Dimensions + Nut Specification + Grade + Material + Finish + Mechanical Testing + Traceability

Conclusion: Heavy Hex Nut Size Is Only One Part of the Specification

Correct Heavy Hex Nut Sizes begin with the mating bolt or stud, but structural procurement requires much more than diameter.

The complete selection chain is:

Bolt/Stud → Diameter → Thread → Heavy Hex Dimensions → Nut Specification → Grade → Material → Heat Treatment → Finish → Mechanical Testing → Installation → Traceability

A heavy hex nut can have the correct dimensions and still be unacceptable if:

The nut grade is wrong.
It is incompatible with the mating bolt.
The thread series is wrong.
Heat treatment is incorrect.
Proof-load requirements are not met.
Galvanized thread accommodation is incorrect.
Required marking is missing.
Traceability cannot be established.

For EPC, structural steel, PEB, bridges and infrastructure, buyers should therefore specify and qualify the complete bolting system.

Rajal Industries can evaluate standard and customer drawing-based heavy hex nuts and Structural Nuts, subject to technical feasibility, material availability, manufacturing process,

Need Heavy Hex Nuts for an EPC or Structural Project?

Send Rajal Industries:

Drawing + Bolt/Stud Specification + Diameter + Thread + Nut Standard + Grade + Finish + Testing + ITP + Documentation + Quantity

for technical feasibility and quotation review.