ASTM A193 Gr B7 Bolts are high-strength alloy steel fasteners manufactured from chromium-molybdenum steel and designed for high-temperature and high-pressure applications.These bolts are commonly used for pressure vessels, valves, flanges, pipelines, petrochemical equipment, power plants, and process industries where reliable mechanical strength is required.
Our SA193 B7 Bolts are manufactured and supplied according to ASTM A193/A193M requirements and can be provided in different dimensions, thread configurations, finishes, and head styles. We supply standard and customized ASTM A193 B7 Fasteners for domestic and international industrial requirements.
What Are ASTM A193 Grade B7 Bolts?
ASTM A193 Grade B7 Bolts are quenched-and-tempered alloy steel fasteners produced from chromium-molybdenum steel, typically based on AISI 4140/4142 chemistry. Grade B7 is widely selected for bolting applications requiring high tensile strength and dependable performance at elevated temperatures.
These fasteners are frequently supplied with ASTM A194 Grade 2H nuts for compatible bolted assemblies. Depending on application requirements, they can be supplied as heavy hex bolts, stud bolts, full-thread studs, and other configurations.
ASTM A193 Grade B7 bolts are high-strength chromium-molybdenum alloy steel fasteners used for high-temperature and high-pressure industrial applications. They are commonly used with ASTM A194 Grade 2H nuts in flanges, valves, pressure vessels, pipelines, and petrochemical equipment.
Table of Contents
- ➤ What Are ASTM A193 Grade B7 Bolts?
- ➤ ASTM A193 Gr B7 Bolts Specifications
- ➤ AISI 4140 Cr-Mo ASTM A193 Grade B7 Bolts
- ➤ Types of ASTM A193 B7 Fasteners We Supply
- ➤ ASTM A193 Grade B7 Mechanical Properties
- ➤ ASTM A193 Grade B7 Chemical Composition
- ➤ Manufacturing Process of ASTM A193 Gr B7 Bolts
- ➤ Applications of ASTM A193 B7 Fasteners
- ➤ Why Choose Our ASTM A193 Grade B7 Bolts?
- ➤ ASTM A193 Grade B7 Bolts Exporter & Stud Bolts Supplier
ASTM A193 Gr B7 Bolts Specifications
| Property | Details |
|---|---|
| Standard | ASTM A193 / A193M |
| Grade | B7 |
| Material | Chromium-Molybdenum Alloy Steel |
| Typical Steel | AISI 4140 / 4142 |
| UNS | G41400 / G41420 |
| Werkstoff Number | 1.7225 commonly associated with 4140 |
| Manufacturing | Forged / Rolled as applicable |
| Heat Treatment | Quenched and Tempered |
| Thread | UNC, UNF, 8UN and customized |
| Head Types | Heavy Hex, Hex and customized |
| Nut Compatibility | ASTM A194 Grade 2H |
| Finish | Plain, Black Oxide, Zinc Plated and customized |
| Application | High-pressure and high-temperature service |
AISI 4140 Cr-Mo ASTM A193 Grade B7 Bolts
AISI 4140 Cr-Mo ASTM A193 Grade B7 Bolts offer a combination of high tensile strength, hardness, toughness, and resistance to deformation under demanding service conditions. Chromium improves hardenability, while molybdenum contributes to strength and resistance to tempering at elevated temperatures.
The bolts undergo controlled heat treatment to achieve the mechanical properties required by ASTM A193 Grade B7. Proper heat treatment is particularly important because it provides the strength and toughness required for industrial bolting applications.
WNR 1.7225 Fasteners are also commonly associated with 42CrMo4/AISI 4140 material. However, material equivalence should always be confirmed against the applicable purchase specification and required mechanical and chemical properties rather than assumed solely from the material designation.
Types of ASTM A193 B7 Fasteners We Supply
We offer ASTM A193 B7 Fasteners in multiple configurations to suit different equipment and assembly requirements.
ASME SA193 B7 Heavy Hex Bolts
ASME SA193 B7 Heavy Hex Bolts feature a larger hexagonal head than standard hex bolts, providing greater wrenching surface and making them suitable for heavy-duty flange and structural assemblies.
ASTM A193 Grade B7 Full Thread Stud Bolts
ASTM A193 Grade B7 Full Thread Stud Bolts are threaded along their complete length and are widely used for flange connections, valves, pressure vessels, and piping systems. Full-thread construction allows the fastener to engage with nuts across the required assembly length.
ASTM A193 Grade B7 Stud Bolts
ASTM A193 Grade B7 Stud Bolts can be supplied in standard and customized lengths, thread configurations, and end conditions. They are commonly selected where a removable and robust bolted connection is required.
Zinc Plated ASTM A193 Grade B7 Heavy Hex Bolts
Zinc Plated ASTM A193 Grade B7 Heavy Hex Bolts can be supplied when an additional protective finish is required. The coating specification should be selected according to the service environment, dimensional requirements, hydrogen-embrittlement considerations, and applicable customer specifications.
ASTM A193 Grade B7 Mechanical Properties
The mechanical properties of Grade B7 are a key reason for its extensive use in pressure and temperature applications.
| Mechanical Property | ASTM A193 Grade B7 |
|---|---|
| Tensile Strength | 125 ksi min. |
| Tensile Strength | 860 MPa min. |
| Yield Strength | 105 ksi min. |
| Yield Strength | 720 MPa min. |
| Hardness | 35 HRC max. |
ASTM A193 Grade B7 Chemical Composition
| Element | Typical / Specification Range |
|---|---|
| Carbon | 0.37–0.49% |
| Manganese | 0.65–1.10% |
| Phosphorus | 0.035% max. |
| Sulfur | 0.040% max. |
| Chromium | 0.75–1.20% |
| Molybdenum | 0.15–0.25% |
Manufacturing Process of ASTM A193 Gr B7 Bolts
Applications of ASTM A193 B7 Fasteners
Because of their strength and suitability for demanding bolting applications, ASTM A193 B7 fasteners are commonly used in:
- Oil and gas pipelines
- Petrochemical plants
- Refineries
- Chemical processing plants
- Power generation plants
- Pressure vessels
- Heat exchangers
- Valves and pumps
- Flanged pipe connections
- Industrial boilers
- Process equipment
- High-pressure piping systems
For applications involving sour service, temperature extremes, corrosion, or other special operating conditions, the complete material and application requirements should be reviewed before selecting the fastener grade.
Why Choose Our ASTM A193 Grade B7 Bolts?
We focus on supplying fasteners that meet the required dimensional, material, and mechanical specifications for industrial applications. Our ASTM A193 Grade B7 Bolts can be supplied in various sizes, lengths, thread forms, head styles, and surface finishes.
Key advantages include:
- ASTM A193 Grade B7 compliant material options
- High tensile and yield strength
- Quenched-and-tempered construction
- Heavy hex bolts and stud bolt configurations
- Full-thread stud options
- Customized sizes and lengths
- Plain and coated finishes
- Inspection and testing documentation
- Export packing and documentation
- Support for bulk and project requirements
ASTM A193 Grade B7 Bolts Exporter & Stud Bolts Supplier
As an ASTM A193 Grade B7 Bolts Exporter, we supply high-strength alloy steel fasteners for industrial projects and international customers. Our product range includes heavy hex bolts, full-thread stud bolts, threaded studs, and other SA193 B7 Bolts manufactured or sourced to the required specifications.
As an ASTM A193 Grade B7 Stud Bolts Supplier, we can support standard and customized requirements based on diameter, length, thread configuration, finish, quantity, and applicable standards.
For a quotation, share the required diameter, length, quantity, thread type, finish, standard, and inspection requirements with our team.
ASTM A193 Grade B7 Bolts Manufacturer and Dealers
ASTM A193 Gr B7 Bolts provide high strength and dependable performance for demanding industrial bolting applications. Their chromium-molybdenum alloy steel construction and quenched-and-tempered condition make them a widely used choice for high-pressure and elevated-temperature equipment.
We supply SA193 B7 Bolts, ASTM A193 B7 Fasteners, heavy hex bolts, and Grade B7 full-thread stud bolts in standard and customized configurations. Contact us with your technical requirements to receive the appropriate specification, availability, documentation, and quotation.
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Frequently Asked Questions
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