ASTM A193 Grade B7 Fasteners are high-strength chromium-molybdenum alloy steel fasteners designed for high-temperature, high-pressure, and demanding industrial applications. Manufactured according to ASTM A193/A193M requirements, Grade B7 fasteners are commonly used for pressure vessels, valves, flanges, pipelines, refineries, petrochemical plants, power-generation equipment, and process piping.
We supply A193 B7 Stud Bolts, ASTM A193 B7 Heavy Hex Bolts, A193 Grade B7 Threaded Rod, ASTM A193 B7 Anchor Bolts, and ASTM A193 B7 Hex Cap Screws in different sizes, thread configurations, finishes, and specifications to suit critical bolting requirements.
Our B7 Alloy Steel Studs are manufactured from heat-treated Cr-Mo alloy steel and can be supplied with compatible nuts such as ASTM A194 Grade 2H, 2HM, and other specified grades depending on the application.
What Are ASTM A193 Grade B7 Fasteners?
ASTM A193 Grade B7 is a chromium-molybdenum alloy steel bolting grade used primarily for high-temperature or high-pressure service. Its combination of strength, toughness, and resistance to elevated-temperature service makes it suitable for industrial equipment where conventional carbon steel fasteners may not provide adequate performance.
The grade is commonly supplied as threaded studs, stud bolts, heavy hex bolts, hex cap screws, threaded rods, and other specially manufactured fasteners.
ASTM A193 Grade B7 fasteners are heat-treated chromium-molybdenum alloy steel fasteners used for high-pressure and high-temperature applications. They are widely used in refineries, petrochemical plants, power plants, pressure vessels, valves, flanges, and process piping.
Table of Contents
- ➤ What Are ASTM A193 Grade B7 Fasteners?
- ➤ ASTM A193 B7 Fasteners Types We Supply
- ➤ ASTM A193 Grade B7 Chemical Composition
- ➤ ASTM A193 B7 Mechanical Properties
- ➤ ASTM A193 B7 Yield Strength and Tensile Strength
- ➤ ASTM A193 B7 Fastener Specifications
- ➤ ASTM A193 B7 Fastener Weight Chart
- ➤ ASTM A193 B7 Equivalent Grades Chart
- ➤ Applications of ASTM A193 Grade B7 Fasteners
- ➤ ASTM A193 B7 Fasteners Manufacturing Process
- ➤ Why Choose Our ASTM A193 Grade B7 Fasteners?
- ➤ ASTM A193 Grade B7 Fasteners Supplier in India
- ➤ ASTM A193 B7 Stud Bolts Supplier in UAE / Saudi Arabia
ASTM A193 B7 Fasteners Types We Supply
Different equipment designs require different fastening configurations. We manufacture and supply the following B7 fastener products:
➤ A193 B7 Stud Bolts
A193 B7 Stud Bolts are threaded fasteners generally used with two nuts for connecting flanges, pressure vessels, valves, and piping components. Full-thread and double-end configurations can be produced according to dimensional and application requirements.
➤ ASTM A193 B7 Heavy Hex Bolts
ASTM A193 B7 Heavy Hex Bolts feature a larger hexagonal head than standard hex bolts, providing greater bearing area and allowing the use of suitable tightening tools. They are commonly selected for heavy-duty industrial assemblies.
➤ A193 Grade B7 Threaded Rod
A193 Grade B7 Threaded Rod provides continuous external threading and can be cut to required lengths. It is useful for structural supports, pipe-support assemblies, equipment installation, and customized bolting applications.
➤ ASTM A193 B7 Anchor Bolts
ASTM A193 B7 Anchor Bolts are used to secure equipment, structures, and components to foundations or supporting members. Customized lengths, thread configurations, bends, and end conditions can be supplied according to drawings.
➤ ASTM A193 B7 Hex Cap Screws
ASTM A193 B7 Hex Cap Screws are externally threaded fasteners with a hexagonal head designed for installation with a wrench or socket. They are suitable where high-strength bolting is required in compact assemblies.
ASTM A193 Grade B7 Chemical Composition
| Element | Typical/Specified Composition (%) |
|---|---|
| Carbon (C) | 0.37–0.49 |
| Manganese (Mn) | 0.65–1.10 |
| Phosphorus (P) | 0.035 max. |
| Sulfur (S) | 0.040 max. |
| Silicon (Si) | 0.15–0.35 |
| Chromium (Cr) | 0.75–1.20 |
| Molybdenum (Mo) | 0.15–0.25 |
ASTM A193 B7 Mechanical Properties
| Mechanical Property | ASTM A193 Grade B7 Requirement* |
|---|---|
| Tensile Strength | 125 ksi min. / 860 MPa min. |
| Yield Strength | 105 ksi min. / 720 MPa min. |
| Elongation | 16% min. |
| Reduction of Area | 50% min. |
| Hardness | 35 HRC max. |
ASTM A193 B7 Yield Strength and Tensile Strength
| Mechanical Property | Minimum Requirement |
|---|---|
| Yield Strength | 105 ksi / 720 MPa |
| Tensile Strength | 125 ksi / 860 MPa |
ASTM A193 B7 Fastener Specifications
| Specification | Details |
|---|---|
| Material | Chromium-Molybdenum Alloy Steel |
| Grade | ASTM A193 Grade B7 |
| Product Forms | Stud Bolts, Bolts, Threaded Rod, Anchor Bolts, Cap Screws |
| Dimensional Standards | ASME B18.2.1, ASME B18.2.2 and project specifications |
| Threads | UNC, UNF, 8UN and metric where specified |
| Manufacturing | Forged, machined, threaded and heat treated |
| Finish | Plain, black oxide, zinc plated or other specified finish |
| Testing | Chemical, mechanical, hardness and dimensional testing as required |
| Certification | Material Test Certificate and inspection documentation available |
ASTM A193 B7 Fastener Weight Chart
The weight of an ASTM A193 B7 stud bolt depends on diameter, thread profile, length, nut configuration, and manufacturing dimensions. The following chart provides approximate weight-per-meter values for commonly used metric fully threaded rod/stud sizes.
| Nominal Size | Diameter | Approx. Weight kg/m |
|---|---|---|
| M12 | 12 mm | 0.72 |
| M16 | 16 mm | 1.29 |
| M20 | 20 mm | 2.04 |
| M24 | 24 mm | 2.94 |
| M30 | 30 mm | 4.66 |
| M36 | 36 mm | 6.76 |
| M42 | 42 mm | 9.24 |
| M48 | 48 mm | 12.10 |
| M56 | 56 mm | 16.50 |
| M64 | 64 mm | 21.60 |
ASTM A193 B7 Equivalent Grades Chart
| Standard / System | Equivalent or Comparable Grade |
|---|---|
| ASTM | ASTM A193 Grade B7 |
| ASME | SA-193 Grade B7 |
| AISI / SAE | 4140 |
| UNS | S41400 |
| EN | 42CrMo4 |
| Werkstoff No. | 1.7225 |
| DIN | 42CrMo4 |
| JIS | SCM440* |
| UK | 708M40* |
| France | 42CD4* |
Applications of ASTM A193 Grade B7 Fasteners
ASTM A193 Grade B7 fasteners are selected for applications where high-strength bolting is required under elevated pressure or temperature conditions.
Common applications include:
- Oil and gas pipelines
- Refineries and petrochemical plants
- Pressure vessels
- Heat exchangers
- Valves and flanges
- Power-generation plants
- Process piping
- Chemical-processing equipment
- Offshore and marine equipment
- Industrial machinery
- Pumps and compressors
- High-pressure equipment
For sour-service applications, the suitability of the selected B7 fastener should be evaluated against the applicable project requirements, NACE/ISO requirements, hardness restrictions, and environmental conditions rather than assuming standard B7 is automatically suitable.
ASTM A193 B7 Fasteners Manufacturing Process
Why Choose Our ASTM A193 Grade B7 Fasteners?
We focus on supplying industrial fasteners with traceable material documentation, consistent dimensions, and project-specific manufacturing capabilities.
Key advantages include:
- ASTM A193 Grade B7 material
- Multiple fastener configurations
- Custom dimensions available
- Heat-treated alloy steel construction
- Material traceability
- MTC and inspection documentation
- Bulk and project-order supply
- International export packaging
- Support for customized requirements
Whether you require standard A193 B7 Stud Bolts or customized B7 Alloy Steel Studs, we can manufacture or supply fasteners according to your drawings, specifications, dimensions, and quantity requirements.
ASTM A193 Grade B7 Fasteners Supplier in India
As an ASTM A193 Grade B7 fasteners supplier in India, we supply B7 alloy steel fasteners for domestic industrial projects and export requirements. Products can be supplied in standard and customized sizes with the required inspection documents and certificates.
Our supply capability includes ASTM A193 B7 fasteners stockist and exporter requirements for distributors, EPC contractors, manufacturers, maintenance companies, and industrial end users.
ASTM A193 B7 Stud Bolts Supplier in UAE / Saudi Arabia
We also support international requirements for ASTM A193 B7 stud bolts supplier in UAE / Saudi Arabia applications. B7 stud bolts can be supplied for oil & gas, petrochemical, power, construction, and industrial projects according to project specifications.
For export orders, we can coordinate product identification, protective packaging, documentation, and shipment requirements based on destination and purchase-order requirements.
Request a Quote for ASTM A193 Grade B7 Fasteners
Need ASTM A193 Grade B7 Fasteners for your next industrial project?
Send us your required diameter, length, quantity, thread type, finish, applicable standard, and inspection requirements. We can recommend a suitable B7 fastener configuration and provide a quotation based on your project requirements.
Frequently Asked Questions About ASTM A193 Grade B7 Fasteners
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