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ASTM A193 B7 Stud Bolts are among the most widely used high-strength fasteners in heavy-duty industrial applications. Manufactured from alloy steel and heat-treated for enhanced durability, these stud bolts are designed to perform reliably under high pressure and elevated temperatures. Known for their consistent strength, hardness, and resistance to wear, B7 stud bolts are trusted for critical bolting in refineries, petrochemical plants, power generation units, and construction sectors. Their versatility and proven performance make them an essential choice wherever secure, high-pressure fastening is required, ensuring long-term safety and operational stability in demanding environments.
ASTM A193 B7 Stud Bolts are produced from chromium-molybdenum alloy steel, providing superior tensile and yield strength. After quenching and tempering, these bolts achieve excellent hardness, toughness, and the ability to withstand high-temperature service. The alloy composition enhances resistance to wear, stretching, and thermal stresses. Their mechanical properties—such as high tensile strength, reliable stress endurance, and stability under fluctuating temperatures—make them suitable for demanding environments. These characteristics ensure the bolts maintain structural integrity, even in critical applications involving pressure vessels, boilers, and high-stress mechanical connections.
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% |
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ASTM A193 B7 Stud Bolts are extensively used in industries requiring fasteners that can handle high pressure, extreme temperatures, and heavy mechanical loads. They are commonly applied in refineries, oil and gas plants, chemical processing units, and power generation facilities. Their strength makes them ideal for securing flanges, valves, boilers, heat exchangers, turbine casings, and pressure vessels. These stud bolts are also widely used in structural engineering, pipeline systems, and industrial machinery assembly. With dependable performance in both elevated and sub-zero temperatures, ASTM A193 B7 Stud Bolts offer long-lasting reliability in critical operations.
At Rinku 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.
Rinku Fasteners is a leading manufacturer and supplier of high-quality fasteners in Kolkata, India, with over 8 years of experience serving global industries.
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