| Quantity: | |
|---|---|
ASTM A193
GYF
Our ASTM A193 B7 / B7M stud bolts with 2H / 2HM nuts (sandblasted finish) are industry-leading high-strength fastening assemblies, engineered for extreme high-temperature and high-pressure industrial environments. Manufactured in strict compliance with ASTM, ASME and API international standards, these stud bolt assemblies deliver exceptional tensile strength, load stability and long-term reliability for industrial purchasers, engineering contractors and heavy fabrication enterprises. The core B7 alloy steel stud bolts and modified B7M low-carbon variant stud bolts are paired with precision-machined ASTM A194 2H / 2HM heavy hex nuts, with a uniform sandblasted surface finish to eliminate surface defects, enhance installation traceability and improve coating adhesion for secondary protection. This full assembly solution eliminates compatibility risks, ensuring consistent performance in the most demanding industrial applications.
Crafted from high-grade chromium-molybdenum alloy steel, our B7 stud bolts undergo full quenching and tempering treatment to achieve superior tensile strength and creep resistance at elevated temperatures, while B7M stud bolts feature optimized tempering processes to reduce hardness, improve hydrogen embrittlement resistance and deliver enhanced stability in moderate low-temperature and sour service environments.
The uniform sandblasted finish removes mill scale, rust and surface imperfections completely, creating a consistent matte surface that improves friction coefficient control during installation, simplifies non-destructive testing (NDT) inspection, and provides an ideal base for subsequent anti-corrosion coatings.
Each stud bolt is paired with a corresponding ASTM A194 2H carbon steel heavy hex nut or 2HM modified nut, precision-threaded to ensure perfect engagement, uniform load distribution across all threads, and reduced risk of thread stripping or loosening under dynamic load and pressure fluctuations.
All our sandblasted stud bolt assemblies meet the requirements of ASTM A193, ASTM A194, ASME B16.5 and API 20E standards, with full material traceability and batch testing documentation available for every order.
Parameter | Specification Details |
Stud Grade | ASTM A193 B7, ASTM A193 B7M |
Matching Nut Grade | ASTM A194 2H, ASTM A194 2HM |
Surface Finish | Sandblasted (custom blast grade available) |
Core Material Standard | ASTM A193 / ASTM A194 |
Thread Type | UNC, UNF, UN8, Metric (custom thread available) |
Nominal Diameter Range | 1/4 inch (6mm) to 4 inches (100mm) |
MOQ | 100 Sets |
Our sandblasted B7 / B7M stud bolt with nut assemblies are widely used in high-demand industrial sectors that require reliable high-pressure and high-temperature fastening, including:
For wellhead equipment, Christmas trees, pipeline flanges, and refinery process units where consistent high-load performance is critical.
For boiler systems, pressure vessels, steam turbine assemblies, and heat exchanger flange connections in power generation facilities.
For reactor vessels, distillation columns, and high-pressure piping systems in chemical and petrochemical plants.
For industrial pressure vessels, hydraulic equipment, and heavy structural fabrication projects that require high-strength, traceable fasteners.
We offer flexible bulk supply and custom manufacturing solutions tailored to the needs of industrial purchasers and fabrication enterprises. We maintain a large in-stock inventory of standard B7 / B7M sandblasted stud bolt assemblies to support urgent project requirements, with low minimum order quantities (MOQ) for small-batch custom projects and high-volume production capacity for large-scale industrial contracts. Our custom services include non-standard length machining, special thread profiles, custom sandblasting grades, matched washer assemblies, and custom material certification requirements. All production processes are ISO 9001 certified, with full batch testing and Mill Test Certificates (MTC 3.1) provided for every bulk order.
B7 stud bolts are standard quenched and tempered chromium-molybdenum alloy steel fasteners for high-temperature, high-pressure general service, while B7M stud bolts use a higher tempering temperature to achieve lower hardness, improved ductility, and enhanced resistance to hydrogen embrittlement, making them ideal for sour service and moderate low-temperature applications.
Sandblasting removes mill scale, surface contaminants and imperfections, improves friction coefficient consistency during tightening, simplifies NDT inspection for surface defects, and creates an optimal adhesion surface for subsequent anti-corrosion coatings.
Yes, every batch of our stud bolt assemblies comes with full material traceability, including Mill Test Certificates (MTC 3.1), batch test reports, and compliance documentation to meet project and regulatory requirements.
Whether you are an industrial purchaser with bulk standard fastener requirements, an engineering contractor with custom project specifications, or a fabrication enterprise with specialized fastening needs, our technical team is ready to support you. Submit your required stud bolt grade, size, quantity, surface finish requirements and project specifications today, and we will provide you with a free, no-obligation custom quote within 24 hours, along with professional technical guidance for your application.
