ASTM A194 Alloy Steel Nuts are high-strength alloy steel nuts designed for use with high-pressure and high-temperature bolting applications. ASTM A194 Grade 7 nuts are commonly manufactured from chromium-molybdenum alloy steel and are used with ASTM A193 Grade B7 bolts and studs in oil & gas, petrochemical, power generation, refinery, and industrial equipment applications. We supply ASTM A194 Heavy Hex Nuts in different sizes, dimensions, finishes, and configurations according to applicable ASTM and ASME requirements.
What Are ASTM A194 Alloy Steel Nuts?
ASTM A194 Alloy Steel Nuts are heavy-duty nuts specified under ASTM A194/A194M for pressure-vessel, valve, flange, and high-temperature or high-pressure service applications. They are designed to provide reliable threaded connections where conventional carbon steel nuts may not provide the required strength and temperature resistance.
Among the commonly requested grades, A194 Gr 7 Alloy Steel Nuts are chromium-molybdenum alloy steel nuts used for demanding bolting applications. Grade 7 nuts are frequently paired with ASTM A193 Grade B7 alloy steel bolts or studs to create high-strength bolting assemblies.
We manufacture and supply these nuts in standard and customized dimensions, with options for surface treatment and inspection documentation according to project requirements.
Table of Contents
- ➤ What Are ASTM A194 Alloy Steel Nuts?
- ➤ ASTM A194 Grade 7 Alloy Steel Nuts
- ➤ ASTM A194 Grade 7 Nuts Specifications
- ➤ ASTM A194 Grade 7 Chemical Composition
- ➤ ASTM A194 Grade 7 Mechanical Properties
- ➤ ASTM A194 Heavy Hex Nuts Dimensions Chart
- ➤ ASTM A194 Grade 7 Heavy Hex Nuts Weight Chart
- ➤ ASTM A194 Grade 7 Equivalent Grades Chart
- ➤ Applications of ASTM A194 Alloy Steel Nuts
- ➤ AISI 4140 ASTM A194 Grade 7 Alloy Nuts
- ➤ ASTM A194 Grade 7 Heavy Hex Nuts Manufacturing Process
- ➤ Why Choose ASTM A194 Grade 7 Heavy Hex Nuts?
- ➤ ASTM A194 Grade 7 Heavy Hex Nuts Manufacturer in Mumbai
- ➤ ASTM A194 Grade 7 Nuts Supplier in India
ASTM A194 Grade 7 Alloy Steel Nuts
A194 Gr 7 Alloy Steel Nuts are manufactured from alloy steel containing chromium and molybdenum, providing a combination of strength, toughness, and resistance to elevated-temperature service.
These nuts are particularly suitable where bolted joints experience significant mechanical loading and temperature fluctuations. Their heavy hex configuration also provides increased wrenching surface compared with standard hex nuts.
Typical applications include:
- Oil and gas pipelines
- Petrochemical plants
- Refineries
- Power generation plants
- Pressure vessels
- Heat exchangers
- Valves and flanges
- Process equipment
- Industrial machinery
- High-pressure piping systems
ASTM A194 Grade 7 Nuts Specifications
| Specification | Details |
|---|---|
| Standard | ASTM A194 / ASME SA194 |
| Grade | Grade 7 |
| Material | Alloy Steel |
| Product Type | Heavy Hex Nuts |
| Configuration | Hex / Heavy Hex |
| Threads | UNC, UNF and other specified threads |
| Dimensions | ASME B18.2.2 / customer specification |
| Heat Treatment | Quenched and Tempered |
| Surface | Plain, Black Oxide, Zinc Plated or as specified |
| Testing | Hardness, dimensional, chemical and mechanical testing as applicable |
| Certification | MTC / inspection documents as required |
ASTM A194 Grade 7 Chemical Composition
| Element | Grade 7 Requirement* |
|---|---|
| Carbon | 0.37–0.49% |
| Manganese | 0.65–1.10% |
| Phosphorus | 0.040% max |
| Sulfur | 0.040% max |
| Silicon | 0.15–0.35% |
| Chromium | 0.75–1.20% |
| Molybdenum | 0.15–0.25% |
ASTM A194 Grade 7 Mechanical Properties
| Property | ASTM A194 Grade 7 |
|---|---|
| Hardness | According to ASTM A194 requirements |
| Tensile strength | According to applicable specification |
| Yield strength | According to applicable specification |
| Heat treatment | Quenched and tempered |
| Material | Chromium-molybdenum alloy steel |
ASTM A194 Heavy Hex Nuts Dimensions Chart
ASTM A194 Heavy Hex Nut Dimensions Chart – Common Sizes
| Nominal Size | Approx. Across Flats | Typical Configuration |
|---|---|---|
| 1/4" | 7/16" | Heavy Hex |
| 3/8" | 5/8" | Heavy Hex |
| 1/2" | 7/8" | Heavy Hex |
| 5/8" | 1-1/16" | Heavy Hex |
| 3/4" | 1-1/4" | Heavy Hex |
| 7/8" | 1-7/16" | Heavy Hex |
| 1" | 1-5/8" | Heavy Hex |
| 1-1/8" | 1-13/16" | Heavy Hex |
| 1-1/4" | 2" | Heavy Hex |
| 1-3/8" | 2-3/16" | Heavy Hex |
| 1-1/2" | 2-3/8" | Heavy Hex |
| 1-3/4" | 2-3/4" | Heavy Hex |
| 2" | 3" | Heavy Hex |
ASTM A194 Grade 7 Heavy Hex Nuts Weight Chart
| Size | Thread | Across Flats | Approx. Weight kg/100 pcs |
|---|---|---|---|
| 1/4" | 20 UNC | 7/16" | 0.30 |
| 5/16" | 18 UNC | 1/2" | 0.40 |
| 3/8" | 16 UNC | 9/16" | 1.40 |
| 7/16" | 14 UNC | 11/16" | 1.90 |
| 1/2" | 13 UNC | 7/8" | 3.00 |
| 9/16" | 12 UNC | 15/16" | 3.70 |
| 5/8" | 11 UNC | 1-1/16" | 5.40 |
| 3/4" | 10 UNC | 1-1/4" | 8.80 |
| 7/8" | 9 UNC | 1-7/16" | 13.50 |
| 1" | 8 UNC | 1-5/8" | 19.30 |
| 1-1/8" | 7 UNC | 1-13/16" | 26.90 |
| 1-1/4" | 7 UNC | 2" | 35.70 |
| 1-3/8" | 6 UNC | 2-3/16" | 46.30 |
| 1-1/2" | 6 UNC | 2-3/8" | 59.50 |
| 1-5/8" | 8 UNS | 2-9/16" | 73.60 |
| 1-3/4" | 5 UNC | 2-3/4" | 92.70 |
| 2" | 8 UNS | 3-1/8" | 135.80 |
| 2-1/4" | 8 UNS | 3-1/2" | 190.30 |
| 2-1/2" | 8 UNS | 3-7/8" | 256.00 |
| 2-3/4" | 8 UNS | 4-1/4" | 335.00 |
| 3" | 8 UNS | 4-5/8" | 432.00 |
ASTM A194 Grade 7 Equivalent Grades Chart
| Standard / Designation | Common Reference | Relationship to A194 Grade 7 |
|---|---|---|
| ASTM A194 Grade 7 | Grade 7 | Original nut specification |
| AISI 4140 | 4140 Cr-Mo steel | Commonly referenced material type |
| AISI 4140H | Hardenability grade | Related Cr-Mo material |
| AISI 4142 | Cr-Mo alloy steel | Commonly referenced material composition |
| AISI 4145 | Cr-Mo alloy steel | Related Cr-Mo material |
| EN 1.7225 | 42CrMo4 | Commonly referenced international Cr-Mo material |
| DIN 42CrMo4 | 42CrMo4 | Similar Cr-Mo alloy family |
| UNS G41400 | AISI 4140 family | Related alloy designation |
Applications of ASTM A194 Alloy Steel Nuts
| Industry | Applications |
|---|---|
| Oil & Gas | Pipelines, valves, flanges and pressure systems |
| Petrochemical | Process equipment and piping |
| Refinery | High-temperature piping and equipment |
| Power Generation | Boilers, turbines and pressure systems |
| Chemical Processing | Reactors and process equipment |
| Engineering | Heavy machinery and industrial assemblies |
| Pressure Vessels | Flanged and bolted connections |
AISI 4140 ASTM A194 Grade 7 Alloy Nuts
AISI 4140 ASTM A194 Grade 7 alloy nuts are often associated with chromium-molybdenum alloy steel compositions used for high-strength fastener applications. AISI 4140 is a widely used Cr-Mo alloy steel and is commonly referenced in relation to Grade 7 bolting materials.
However, material equivalency should not be assumed solely from a grade name. The supplied nuts should meet the chemical, mechanical, heat-treatment, hardness, dimensional, and testing requirements of the specified ASTM A194 grade.
This distinction is particularly important for critical pressure and high-temperature applications where traceability and specification compliance are essential.
ASTM A194 Grade 7 Heavy Hex Nuts Manufacturing Process
Why Choose ASTM A194 Grade 7 Heavy Hex Nuts?
Grade 7 nuts are selected for applications requiring dependable high-strength bolting under pressure and elevated-temperature conditions.
Key advantages include:
- High-strength alloy steel construction
- Suitable for high-pressure bolting assemblies
- Good performance at elevated temperatures
- Compatible with common Cr-Mo bolting systems
- Heavy hex configuration for improved wrench engagement
- Available in a broad range of sizes
- Suitable for customized requirements
- Inspection and material traceability options
ASTM A194 Grade 7 Heavy Hex Nuts Manufacturer in Mumbai
As an ASTM A194 Grade 7 Heavy Hex Nuts manufacturer in Mumbai, we supply alloy steel nuts for domestic and international industrial requirements. Our products can be supplied in standard sizes as well as according to drawings, specifications, thread requirements, and project-specific requirements.
We focus on material identification, dimensional accuracy, appropriate heat treatment, inspection, and documentation to support demanding industrial applications.
For bulk requirements, customers can contact us with the required size, quantity, grade, thread, finish, standard, and delivery location so that we can recommend the appropriate configuration.
ASTM A194 Grade 7 Nuts Supplier in India
We are an ASTM A194 Grade 7 nuts supplier in India serving industries that require reliable alloy steel bolting components for pressure, temperature, and structural applications.
Our supply range can include:
- ASTM A194 Grade 7 Heavy Hex Nuts
- ASTM A194 Alloy Steel Nuts
- Heavy Hex Nuts
- Hex Nuts
- Customized Alloy Steel Nuts
- Special Thread Nuts
- Metric and Imperial Nuts
- Plain and coated nuts
Products can be supplied with relevant inspection and certification documents according to customer and project requirements.
Get ASTM A194 Grade 7 Heavy Hex Nuts
Looking for reliable ASTM A194 Grade 7 Heavy Hex Nuts for high-pressure or high-temperature applications? We can supply Grade 7 alloy steel nuts in required sizes, thread configurations, finishes, and quantities.
Send us your requirement with the size, quantity, specification, thread type, finish, and delivery location to receive a quotation.
Frequently Asked Questions About ASTM A193 Grade B7 Fasteners
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