ASTM A194 Carbon Steel Nuts are high-strength nuts designed for use with bolts, studs, and other fasteners in pressure vessels, valves, flanges, piping systems, and high-pressure applications. Manufactured from carbon and alloy steel grades, these nuts are available in heavy hex configurations and are selected where higher mechanical strength and reliable bolting performance are required.
We manufacture and supply ASME SA194 Carbon Steel Nuts in grades such as ASTM A194 Grade 2H Nuts and ASTM A194 Grade 2HM Nuts. These fasteners can be supplied in standard dimensions according to ASME B18.2.2 Heavy Hex Nuts and can be produced with suitable heat treatment, testing, and surface finishes according to project requirements.
➤ What Are ASTM A194 Carbon Steel Nuts?
ASTM A194 Carbon Steel Nuts are high-strength pressure vessel and piping nuts manufactured to ASTM A194 specifications. Grade 2H nuts are commonly quenched and tempered for high-strength applications, while Grade 2HM nuts are designed for sour-service applications when specified with NACE MR0175 / ISO 15156 requirements.
- Common grades: ASTM A194 Grade 2H, Grade 2HM
- Standard: ASTM A194 / ASME SA194
- Nut type: Heavy Hex Nut
- Dimensions: ASME B18.2.2
- Applications: Pressure vessels, pipelines, refineries, petrochemical plants, oil & gas systems
Table of Contents
- ➤ What Are ASTM A194 Carbon Steel Nuts?
- ➤ ASTM A194 Carbon Steel Nuts Specifications
- ➤ Types of ASTM A194 Carbon Steel Nuts
- ➤ ASTM A194 Carbon Steel Nuts Mechanical Properties
- ➤ ASTM A194 Carbon Steel Nuts Chemical Composition
- ➤ ASTM A194 Carbon Steel Nuts Equivalent Grades
- ➤ ASTM A194 Carbon Steel Nuts Weight Chart
- ➤ ASTM A194 Carbon Steel Nuts Dimensions
- ➤ Manufacturing Process of ASTM A194 Carbon Steel Nuts
- ➤ Applications of ASTM A194 Carbon Steel Nuts
- ➤ Why Choose Our ASTM A194 Carbon Steel Nuts?
- ➤ ASTM A194 Carbon Steel Nuts Supplier and Exporter in India
ASTM A194 Carbon Steel Nuts Specifications
| Property | Details |
|---|---|
| Standard | ASTM A194 / ASME SA194 |
| Material | Carbon Steel / Alloy Steel |
| Common Grades | Grade 2H, Grade 2HM |
| Nut Type | Heavy Hex Nut |
| Dimensional Standard | ASME B18.2.2 |
| Thread Standards | ASME B1.1 / project-specific |
| Manufacturing | Forged / machined as applicable |
| Heat Treatment | Quenched and Tempered |
| Surface | Plain, black oxide, zinc plated, hot-dip galvanized, custom |
| Testing | Mechanical, hardness, chemical, dimensional and other project-specific tests |
| Application | High-pressure and high-temperature bolting |
Types of ASTM A194 Carbon Steel Nuts
Different configurations and grades are available depending on application, bolt compatibility, and service conditions.
➤ ASTM A194 Grade 2H Nuts
ASTM A194 Grade 2H Nuts are high-strength heavy hex nuts commonly used with ASTM A193 B7 studs and bolts in pressure and piping applications. Grade 2H nuts are generally supplied in the quenched and tempered condition to achieve the required mechanical properties.
They are widely used in refineries, petrochemical facilities, power plants, pressure vessels, and industrial piping systems.
➤ ASTM A194 Grade 2HM Nuts
ASTM A194 Grade 2HM Nuts are high-strength nuts intended for applications requiring resistance to sulfide stress cracking under specified sour-service conditions. They are commonly selected for oil and gas equipment where NACE MR0175 / ISO 15156 requirements apply.
The required hardness and material condition should always be confirmed against the applicable project specification and sour-service requirements.
➤ ASTM A194 Heavy Hex Nuts
Heavy hex nuts provide a larger bearing surface and greater wrenching area than standard hex nuts. ASME B18.2.2 Heavy Hex Nuts are commonly specified with heavy hex bolts and studs for industrial bolting assemblies.
➤ Quenched and Tempered ASTM A194 2H Nuts
Heat treatment is important for Grade 2H nuts because it provides the strength and hardness required for demanding bolting applications. Quenched and tempered ASTM A194 2H nuts are therefore commonly selected for high-pressure flange and piping connections.
➤ NACE MR0175 / ISO 15156 ASTM A194 2HM Nuts
For sour-service applications, ASTM A194 2HM Nuts may be supplied to the applicable NACE MR0175 / ISO 15156 requirements. These nuts are used where hydrogen sulfide- containing environments can create material cracking risks.
ASTM A194 Carbon Steel Nuts Mechanical Properties
The mechanical requirements vary by grade and applicable product specification. Typical requirements for commonly supplied Grade 2H and 2HM nuts include:
| Mechanical Property | ASTM A194 Grade 2H | ASTM A194 Grade 2HM |
|---|---|---|
| Minimum Tensile Strength | 150 ksi (1035 MPa) | 150 ksi (1035 MPa) |
| Minimum Yield Strength | 105 ksi (725 MPa) | 105 ksi (725 MPa) |
| Hardness | 24–38 HRC* | 24 HRC max* |
| Heat Treatment | Quenched & Tempered | Quenched & Tempered |
| Service Focus | High-strength bolting | Sour-service bolting |
ASTM A194 Carbon Steel Nuts Chemical Composition
The chemical composition depends on the specific ASTM A194 grade and applicable specification requirements. A typical composition range for Grade 2H/2HM material is shown below for reference:
| Element | Typical Requirement / Range |
|---|---|
| Carbon (C) | 0.20–0.40% |
| Manganese (Mn) | 0.60–0.90% |
| Phosphorus (P) | 0.040% max |
| Sulfur (S) | 0.050% max |
| Silicon (Si) | 0.15–0.35% |
| Iron (Fe) | Balance |
ASTM A194 Carbon Steel Nuts Equivalent Grades
| Standard | Comparable Grade / Specification |
|---|---|
| ASTM | ASTM A194 Grade 2H |
| ASME | SA194 Grade 2H |
| ASTM | ASTM A194 Grade 2HM |
| ASME | SA194 Grade 2HM |
| DIN | Comparable high-strength heavy hex grades may be specified based on application |
| ISO | Comparable property classes may be considered only after engineering verification |
| NACE | Grade 2HM for applicable sour-service requirements |
ASTM A194 Carbon Steel Nuts Weight Chart
| Nominal Size | Approx. Weight per 100 Pieces |
|---|---|
| 1/4" | 0.40 kg |
| 5/16" | 0.65 kg |
| 3/8" | 1.00 kg |
| 7/16" | 1.45 kg |
| 1/2" | 2.00 kg |
| 5/8" | 3.50 kg |
| 3/4" | 5.50 kg |
| 7/8" | 8.00 kg |
| 1" | 10.50 kg |
| 1-1/8" | 14.00 kg |
| 1-1/4" | 18.00 kg |
| 1-3/8" | 23.00 kg |
| 1-1/2" | 29.00 kg |
| 1-3/4" | 42.00 kg |
| 2" | 57.00 kg |
ASTM A194 Carbon Steel Nuts Dimensions
| Parameter | Available Options |
|---|---|
| Nut Sizes | 1/4" to 4" and larger on request |
| Thread | UNC, UNF, 8UN and special threads |
| Nut Configuration | Heavy Hex, standard configurations as specified |
| Dimensional Standard | ASME B18.2.2 |
| Metric Sizes | Available on request |
| Special Dimensions | Available as per drawing |
| Tolerance | As per applicable standard |
Manufacturing Process of ASTM A194 Carbon Steel Nuts
Applications of ASTM A194 Carbon Steel Nuts
ASTM A194 Carbon Steel Nuts are commonly used in industries where high-strength bolted connections are required.
- Oil & Gas: Used for pipelines, pressure equipment, valves, flanges, and process systems.
- Petrochemical: Suitable for process piping, reactors, heat exchangers, and refinery equipment.
- Power Generation: Used in boilers, pressure vessels, steam systems, turbines, and industrial piping.
- Chemical Processing: Suitable for equipment and piping requiring reliable high-strength fastening.
- Pressure Vessels: Grade 2H nuts are commonly paired with high-strength studs for pressure-retaining connections.
- Construction & Heavy Engineering: Used for structural and mechanical assemblies requiring heavy-duty bolting.
Why Choose Our ASTM A194 Carbon Steel Nuts?
As an ASTM A194 Carbon Steel Nuts Manufacturer and Supplier, we focus on consistent material quality, dimensional accuracy, traceability, and dependable supply.
- ASTM A194 / ASME SA194 compliant products
- Grade 2H and 2HM availability
- Heavy hex configurations
- ASME B18.2.2 dimensional compliance
- Controlled heat treatment
- Batch traceability
- Inspection and testing documentation
- Custom sizes and specifications
- Suitable packaging for domestic and export shipments
- Bulk orders and project requirements supported
We also supply ASTM A194 Heavy Hex Nuts for applications requiring compatibility with high-strength studs and bolts.
ASTM A194 Carbon Steel Nuts Supplier and Exporter in India
We supply ASTM A194 Carbon Steel Nuts to distributors, EPC contractors, manufacturers, fabricators, and industrial buyers. Our product range includes ASTM A194 Grade 2H Nuts, Grade 2HM Nuts, and heavy hex configurations for demanding industrial applications.
As ASTM A194 Heavy Hex Nuts Exporters in India, we support export orders with suitable packaging, documentation, inspection coordination, and shipment preparation. Product sizes, grades, finishes, testing requirements, and documentation can be customized according to the project purchase specification.
➤ Request a Quote for ASTM A194 Carbon Steel Nuts
Need reliable ASTM A194 Carbon Steel Nuts for your pressure vessel, piping, refinery, or oil and gas application? Contact us today for competitive pricing and dependable supply of ASTM A194 Grade 2H Nuts, Grade 2HM Nuts, and heavy hex configurations.
Our team can assist with:
- ASTM A194 / ASME SA194 Grade 2H and 2HM nuts
- Custom sizes, threads, and dimensions
- ASME B18.2.2 heavy hex nut requirements
- Heat treatment and NACE MR0175 / ISO 15156 requirements
- Inspection, testing, and material certification
- Export packaging and delivery coordination
Send us your required grade, size, quantity, specifications, and delivery location to receive a prompt quotation for high-strength ASTM A194 Carbon Steel Nuts tailored to your project requirements.
Frequently Asked Questions
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