A193 B7 Threaded Rod | ASTM A193 Grade B7 Stud Stock
A193 B7 threaded rod is a high-tensile chromium-molybdenum alloy steel fastener manufactured to ASTM A193 Grade B7 specification. Designed for high-temperature and high-pressure applications, this B7 stud bolt stock is widely used in marine engine rooms for securing flanged connections on exhaust manifolds, turbochargers, and steam lines where both strength and moderate corrosion resistance are required.
EachASTM A193 Grade B7 rod is heat treated by quenching and tempering to achieve a minimum tensile strength of 125 ksi (860 MPa). The chromium-molybdenum chemistry provides enhanced creep resistance at elevated temperatures up to 450°C, making it the primary choice for Class 1 and Class 2 bolting in shipboard machinery systems. For sour service environments (H2S-bearing), the B7M variant with reduced hardness is available to comply with NACE MR0175/ISO 15156.
| Product Name | A193 B7 Threaded Rod / Stud Bolt Stock |
| Standard | ASTM A193 / A193M Grade B7, B7M/A193 B7M |
| Type | Fully Threaded Rod, Double-End Stud, Tap End Stud |
| Size Range | 1/4"- 4"(M6 - M100 available) |
| Material | Chromium-Molybdenum Alloy Steel (AISI 4140 / 4142) |
| Grade / Class | Grade B7, B7M (NACE) |
| Tensile Strength | 125 ksi (860 MPa) min |
| Temperature Range | -29°C to +450°C |
| Surface Treatment | Plain (Black), Black Oxide, Zinc Plated, PTFE Coated |
| Applications | Marine engine room, exhaust manifold, flange connection, turbocharger, steam line |
| Certification | EN 10204 3.1 / 3.2, IACS Approved |
AllB7 threaded rod is supplied with mill test report as standard. Custom cut lengths, nut and washer kits, and dual-certified B7M material are available on request.
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