ASTM A194 2H High Strength Fasteners – Grade 2H Heavy Hex Nuts

ASTM A194 Gr 2H Fasteners are high-strength carbon steel bolting components designed for high-pressure and high-temperature applications. Grade 2H is a quenched and tempered carbon steel grade commonly supplied as heavy hex nuts for use with high-strength stud bolts and other industrial bolting systems. ASTM A194 covers carbon, alloy, and stainless steel nuts intended for high-pressure and/or high-temperature service.

We manufacture and supply ASTM A194 Grade 2H Fasteners in standard and customized dimensions for refineries, petrochemical plants, power generation facilities, pressure vessels, pipelines, valves, flanges, and process equipment. Our range includes A194 Gr 2H Heavy Hex Nuts, hex nuts, coupling nuts, and other configurations manufactured according to project requirements.

What Are ASTM A194 Grade 2H Fasteners?

ASTM A194 Grade 2H Fasteners are quenched and tempered carbon steel fasteners specified for demanding bolting applications. In practice, Grade 2H is particularly associated with heavy hex nuts used alongside ASTM A193 Grade B7 stud bolts in flange and pressure-boundary connections.

The "H" designation identifies the heat-treated condition. This treatment provides the strength and hardness required for industrial bolting applications where conventional carbon steel nuts may not provide sufficient performance.

A194 Gr 2H Heavy Hex Nuts are generally manufactured to ASME B18.2.2 dimensional requirements for inch-series heavy hex nuts. Threading is commonly supplied as UNC, with 8UN thread series frequently used for larger diameters.

ASTM A194 Grade 2H is a quenched and tempered carbon steel nut grade used for high-pressure and high-temperature bolting applications. Grade 2H heavy hex nuts are commonly manufactured to ASME B18.2.2 dimensions and are frequently paired with ASTM A193 Grade B7 stud bolts in flange, valve, refinery, petrochemical, and pressure-vessel assemblies.

ASTM A194 Gr 2H Fasteners Specifications

ASTM A194 Gr 2H Hardness 24-35 HRC

The ASTM A194 Gr 2H Hardness 24-35 HRC requirement is an important property for identifying Grade 2H nuts. For completed nuts up to and including 1½ inches or M36, commonly specified hardness is 248–327 HBW or 24–35 HRC. For larger sizes, the requirement is expressed differently, including a maximum of 35 HRC and a minimum HRB requirement.

Heat treatment improves the strength and hardness of the nut while maintaining the mechanical characteristics needed for high-load bolting assemblies.

ASTM A194 Grade 2H Chemical Composition

ASTM A194 2H High Strength Fasteners Mechanical Properties

A194 Gr 2H Heavy Hex Nuts Dimensions

ANSI B18.2.2 2H Nuts are manufactured according to recognized heavy hex dimensional requirements. The standard controls important dimensions such as width across flats and nut thickness, allowing the nuts to be correctly installed with compatible tooling and mating components.

Common sizes include:

• Inch Sizes: 1/4", 5/16", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-1/2", 1-3/4", 2", and larger sizes as required.
• Metric Sizes: M6 and larger sizes can be supplied where applicable to the governing specification and purchase requirements.

For larger diameter nuts, 8UN threads are commonly used, particularly where compatibility with high-strength stud bolts is required.

ASTM A194 Grade 2H Heavy Hex Nuts Types

We supply ASTM A194 Grade 2H Heavy Hex Nuts in configurations suitable for different industrial requirements, including:

• ASTM A194 Grade 2H Heavy Hex Nuts
• A194 Gr 2H Hex Nuts
• ASTM A194 2H Coupling Nuts
• Heavy Hex Jam Nuts where specified
• Inch-series Grade 2H Nuts
• Metric Grade 2H Nuts where applicable
• Plain Finish Grade 2H Nuts
• Zinc Plated ASTM A194 Grade 2H Fasteners
• Customized dimensions and threading

Surface treatment should be selected based on the service environment and project specification. Zinc plating can provide additional corrosion protection for suitable applications, but coating compatibility, hydrogen embrittlement considerations, temperature exposure, and the applicable coating specification should be reviewed before use.

Applications of ASTM A194 Gr 2H Fasteners

ASTM A194 Gr 2H Fasteners are used where high-strength bolting is required in industrial equipment and pressure-containing assemblies.

Major applications include:

• Oil and gas refineries
• Petrochemical plants
• Chemical processing equipment
• Power generation plants
• Pressure vessels
• Heat exchangers
• Pipelines
• Valves and pumps
• Flanged pipe connections
• Process equipment
• Structural and mechanical assemblies
• Offshore and marine equipment

Their combination of heat treatment, hardness, strength, and dimensional consistency makes them suitable for demanding bolting environments.

ASTM A194 Gr 2H Fasteners Manufacturing Process

Quality Testing for ASTM A194 Grade 2H Fasteners

To support reliable performance, Grade 2H fasteners can be inspected and tested according to the applicable specification and customer requirements.

Typical quality checks include:

• Chemical composition testing
• Hardness testing
• Dimensional inspection
• Thread inspection
• Visual inspection
• Proof load testing where specified
• Heat-treatment verification
• PMI where required
• Material traceability
• Third-party inspection

We maintain batch and material traceability to help customers verify that supplied fasteners meet the specified requirements.

Why We are The Best Choice for ASTM A194 Gr 2H Fasteners?

Choosing the right supplier is important for pressure and high-temperature bolting applications. We focus on specification compliance, consistent quality, accurate dimensions, and dependable supply.

Why customers choose us:

• ASTM A194 Grade 2H compliant products
• Heavy hex and customized configurations
• Multiple sizes and thread options
• Controlled heat treatment
• Hardness and dimensional inspection
• Material traceability
• Custom surface finishes
• Export-quality packaging
• Documentation support
• Bulk and project-based supply

Whether you need a small quantity for maintenance or bulk material for a complete industrial project, we can support your sourcing requirements.

ASTM A194 Gr 2H Fasteners Manufacturer, Stockist & Exporter in India

As an ASTM A194 Gr 2H Fasteners Manufacturer, we supply high-strength Grade 2H nuts and fasteners for industrial customers, distributors, contractors, and EPC projects.

We also operate as an ASTM A194 2H Heavy Hex Nuts Stockist, helping customers source standard sizes as well as project-specific requirements. Our supply capabilities support domestic and international requirements, including customers looking for A194 Gr 2H Fasteners Exporters in India.

For project orders, share the required size, quantity, thread, finish, applicable standard, inspection requirements, and delivery destination. We can recommend a suitable Grade 2H configuration based on the application.

Get a Quote for ASTM A194 Gr 2H Fasteners

Looking for ASTM A194 Gr 2H Fasteners, Grade 2H heavy hex nuts, or project-specific high-strength bolting?

Send us your required size, quantity, thread type, finish, standard, inspection requirements, and delivery location. We will help you select and quote the appropriate ASTM A194 Grade 2H fasteners for your application.

ASTM A194 Grade 2H Fasteners FAQs

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