Industrial SA-193 GR. B7 Stud Bolt

Description:

The ASTM SA-193 Grade B7 Stud Bolt is a high-strength alloy steel fastener used in safety relief valves (SRV), pressure vessels, and high-pressure piping systems. Commonly installed on SRV inlet flanges, heat exchangers, pumps, compressors, and refinery equipment requiring secure bolted connections under high temperature and pressure conditions. Maintenance teams, plant operators, and OEM service technicians use this stud bolt for equipment repairs, flange assembly, and replacement of critical pressure-retaining fasteners. ASTM A193 Grade B7 is one of the most widely specified bolting materials for refinery, petrochemical, and power generation applications.

Applications:

The ASTM SA-193 Grade B7 Stud Bolt is designed for high-temperature and high-pressure bolted joints in industrial environments. It is commonly used in safety relief valve (SRV) inlet flanges, pressure vessels, pipeline systems, refineries, petrochemical plants, and power generation facilities where high tensile strength and heat resistance are required. The 1-5/8 in × 8 in size is frequently used on large flange connections and critical pressure-containing equipment.

Technical Specifications:

• Product Type: Stud Bolt
• Application: Safety Relief Valve (SRV) Inlet Flange
• Material Standard: ASTM A193 / ASME SA193
• Material Grade: Grade B7
• Material Composition: Chromium-Molybdenum Alloy Steel (AISI 4140 / 4142)
• Diameter: 1-5/8 in
• Length: 8 in
• Thread Type: UNC, UNF, or 8UN (application dependent)
• Thread Configuration: Fully Threaded or Double-End Threaded
• Heat Treatment: Quenched and Tempered
• Minimum Tensile Strength: 125 ksi (860 MPa)
• Minimum Yield Strength: 105 ksi (720 MPa)
• Minimum Elongation: 16%
• Maximum Hardness: 35 HRC
• Compatible Nuts: ASTM A194 Grade 2H Heavy Hex Nuts
• Temperature Rating: Up to 450°C (840°F)
• Standards: ASTM A193, ASME B1.1, ASME B16.5
• Certifications: ASTM / ASME Compliant
• Typical Industries: Oil & Gas, Petrochemical, Chemical Processing, Power Generation
• Application Environment: High-pressure and high-temperature flange connections

Common Replacements:

• ASTM A193 Grade B16 Stud Bolt
• ASTM A320 Grade L7 Stud Bolt
• ASTM A193 Grade B7M Stud Bolt