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ASTM A193 B7 stud bolts from Hazlewood Fasteners in Canberra, Australia, are engineered to deliver rugged performance, uncompromising strength, and unwavering stability across high-stress industrial environments. Manufactured from premium alloy steel and heat-treated for maximum durability, these studs command authority in high-temperature and high-pressure applications where ordinary fasteners are simply not enough. Built for refineries, power stations, petrochemical units, and heavy-duty machinery, they stand resilient against thermal shock, vibration, and demanding mechanical loads. When infrastructure reliability and operational continuity demand steadfast fastening security, our B7 stud bolts rise as the backbone of critical bolted systems.
ASTM A193 B7 stud bolts are crafted from chromium-molybdenum alloy steel, quenched and tempered to achieve exceptional tensile strength, hardness, and fatigue resistance. This metallurgy delivers superior performance under heat, mechanical stress, and fluctuating load conditions. With elevated yield strength, high stress-rupture tolerance, and reliable toughness, these studs maintain thread integrity and clamping force even in intense service environments. Engineered for durability and consistency, B7 studs ensure dependable structural stability across high-pressure and high-temperature industrial systems.
Material | Specification | Standards | Size | Length |
ASTM A193 B7 Stud Bolt | IS BS ASTM | DIN, ISO, JIS, GB, IS, BS, ASTM | M 02 to M 160 | 3 mm to 200 mm |
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min |
| B7 | Up to 2-1/2 | 125 | 105 | 16 | 50 |
| 2-5/8 – 4 | 115 | 95 | 16 | 50 | |
| 4-1/8 – 7 | 100 | 75 | 18 | 50 | |
| B8 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M Class 1 | All | 75 | 30 | 30 | 50 |
| B8 Class 2 | Up to 3/4 | 125 | 100 | 12 | 35 |
| 7/8 – 1 | 115 | 80 | 15 | 35 | |
| 1-1/8 – 1-1/4 | 105 | 65 | 20 | 35 | |
| 1-3/8 – 1-1/2 | 100 | 50 | 28 | 45 |
| Element | B7 | B8 | B8M |
| Carbon | 0.37 – 0.49% | 0.08% max | 0.08% max |
| Manganese | 0.65 – 1.10% | 2.00% max | 2.00% max |
| Phosphorus, max | 0.035% | 0.045% | 0.045% |
| Sulfur, max | 0.040% | 0.030% | 0.030% |
| Silicon | 0.15 – 0.35% | 1.00% max | 1.00% max |
| Chromium | 0.75 – 1.20% | 18.0 – 20.0% | 16.0 – 18.0% |
| Nickel | 8.0 – 11.0% | 10.0 – 14.0% | |
| Molybdenum | 0.15 – 0.25% | 2.00 – 3.00% |
To satisfy our clients needs by providing high quality products at competitive price as per the schedule and to maintain long term relationship with our clients.
ASTM A193 B7 stud bolts are the trusted choice for heavy-industry operations requiring high-strength fastening under heat and pressure. Common applications include refinery piping networks, steam systems, industrial boilers, turbines, reactor vessels, power generation equipment, compressors, heat-exchangers, and petrochemical flanges. They safeguard pressure-boundary joints, anchor mechanical assemblies, and maintain leak-proof connections in thermally active and high-load systems. Whether tightening critical flange connections or securing mission-critical equipment, B7 stud bolts ensure long-term fastening reliability, structural assurance, and operational safety across the toughest engineering landscapes.
At Hazlewood Fasteners, we prioritize the safe and secure packaging of our ASTM A193 B7 stud bolts. Each bolt is meticulously packed to prevent damage during transit. We use sturdy, corrosion-resistant materials and ensure proper labeling for easy identification. Our packaging solutions include durable wooden crates, pallets, and customized options to meet specific client needs. By adhering to international packaging standards, we guarantee that our stud bolts arrive in perfect condition, ready for immediate use.
Hazlewood Fasteners is a leading manufacturer and supplier of high-quality fasteners in Canberra, Australia, with over 8 years of experience serving global industries.
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