English
Source ASTM A193 B7 stud bolts from a 33-year fastener factory. Fully threaded and double-end studs with Grade 2H nuts, cut and threaded to length, tested per batch.
Haosheng Fasteners supplies premium ASTM A193 Grade B7 stud bolts, including fully threaded studs and double-end studs, for flanged connections in industrial piping, valves, and pressure equipment. Manufactured from chromium-molybdenum alloy steel and quenched and tempered to achieve specified mechanical properties, B7 studs are the standard bolting choice wherever reliable high-temperature strength is required.
B7 studs are normally assembled with ASTM A194 Grade 2H heavy hex nuts, and thread options include UNC, 8UN, and metric M series. Fully threaded studs can be supplied per applicable ASME threaded-rod requirements, while double-end studs are produced to applicable standards or customer drawings, with cutting and threading to length as required.
In addition to stud bolts, we also supply B7 hex head bolts and B7M studs upon request. Our team works with customers to confirm diameter, length, thread specifications, finishes, and inspection requirements before production and delivery.
| Product | ASTM A193 B7 Stud Bolts | Material Grade | ASTM A193 Grade B7 |
|---|---|---|---|
| Material | Chromium-Molybdenum Alloy Steel | Heat Treatment | Quenched and Tempered |
| Product Forms | Fully Threaded Studs, Double-End Studs | Companion Nuts | ASTM A194 Grade 2H |
| Dimensional Standards | Applicable ASME requirements / customer drawings | Thread Options | UNC, 8UN, Metric M |
| Tensile Strength | Min. 125 ksi (approx. 860 MPa) for diameters up to 2½ inches | Yield Strength | Min. 105 ksi (approx. 725 MPa) for the same diameter range |
| Surface Finish | Plain, Black Finish, Custom Coatings | Size Range | According to Customer Requirements |
| Customization | Cutting and Threading to Length, Drawing-Based Manufacturing | Inspection | Dimensional, Thread and Mechanical Property Testing as Required |
Note: ASTM A193 defines material and performance requirements, while applicable dimensional standards or customer drawings define product geometry. Mechanical properties vary according to diameter and the applicable specification edition.
B7 studs are the standard bolting choice for piping flanges, valves, and pressure-equipment assemblies in industrial service.
Quenched-and-tempered chromium-molybdenum alloy steel provides a minimum 125 ksi tensile strength for diameters up to 2½ inches.
Fully threaded studs engage nuts anywhere along the length; double-end studs provide a plain center for grip and alignment.
Studs are supplied to the length your joint design requires, covering thick flanges, long engagement, and special projects.
ASTM A194 Grade 2H heavy hex nuts are supplied together with B7 studs for compatible industrial fastening assemblies.
The molybdenum addition keeps mechanical properties stable at elevated service temperatures, where standard class 8.8 fasteners lose preload.
All photographs in this gallery show actual products from our stock: B7 stud bolts, B7 hex head bolts, and Grade 2H nuts with visible grade markings. Double-end studs are available to order and can be photographed on request.
Material grades, chemical composition requirements, and relevant documentation are reviewed according to customer specifications.
Appropriate quenching and tempering processes are used to achieve specified mechanical properties, with testing as required.
Thread profiles, diameters, lengths, and straightness are checked against agreed standards and drawings.
Specifications, quantities, production arrangements, and delivery requirements are confirmed before order fulfillment.
Surface finishes are evaluated according to corrosion requirements, thread compatibility, service conditions, and coating processes.
Suitable packaging solutions help protect threads and markings during handling, storage, and international transportation.
| Feature | B7 Fully Threaded Studs | B7 Double-End Studs | B7 Hex Head Bolts |
|---|---|---|---|
| Construction | Headless, threaded along the full length | Threaded at both ends, with optional plain center | Hexagonal head with threaded shank |
| Material Grade | ASTM A193 B7 | ASTM A193 B7 | ASTM A193 B7 |
| Typical Applications | Piping flanges and pressure equipment | Valves and equipment assemblies | Industrial equipment and bolted connections |
| Thread Options | UNC, 8UN, Metric M | UNC, 8UN, Metric M | Metric or Inch-Series |
| Supply Options | Featured Product | Available to Order | Available to Order |
Fastener configurations are not automatically interchangeable. Product selection should follow the applicable joint design and engineering requirements.
A fully threaded stud is threaded along its entire length, so nuts can engage anywhere and both ends are usable. A double-end stud is threaded at both ends with an optional plain center, which helps positioning and protects the shank. The choice should follow the joint design.
B7 is a material grade under ASTM A193, commonly used for specified pressure-equipment and piping applications. Class 8.8 is a metric fastener property class. They follow different requirements and should not be substituted based on strength alone.
Yes. UNC and 8UN thread options can be evaluated according to the specified diameter, product standard, and project requirements, and metric M threads are also available.
ASTM A194 Grade 2H nuts are a common companion for ASTM A193 Grade B7 bolting. Final compatibility requires confirmation of thread, dimensions, and joint design.
Yes. B7 hex head bolts are available alongside stud bolts, and B7M studs can be supplied on request. The photographs on this page show B7 studs, hex head bolts, and Grade 2H nuts from our stock.
Plain or black finishes and other coatings may be evaluated. Coating selection should consider service conditions, thread fit, tightening behavior, and potential hydrogen embrittlement.
Hit enter to search or ESC to close
If you are interested in our products, you can choose to leave your information here, and we will be in touch with you shortly.
