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ASTM A193 B8 CL5 Stud Bolts are high-performance stainless steel fasteners designed for demanding industrial applications where maximum strength and corrosion resistance are essential. Manufactured from austenitic stainless steel in a Class 5 strain-hardened condition, these stud bolts offer superior mechanical properties compared to standard B8 and lower class fasteners. Ideal for high-pressure, high-temperature, and corrosive environments, they are widely used in petrochemical plants, refineries, power generation units, and marine applications. With precision manufacturing and rigorous quality control, ASTM A193 B8 CL5 Stud Bolts ensure reliable, long-term performance, helping industries maintain safe and efficient operations.
ASTM A193 B8 CL5 Stud Bolts are made from austenitic stainless steel, typically Grade 304, alloyed with chromium and nickel to provide excellent corrosion resistance. The Class 5 strain-hardening process significantly increases tensile and yield strength while maintaining good ductility and toughness. These stud bolts demonstrate stable mechanical performance under high temperature, mechanical stress, and cyclic loading. They resist stress corrosion cracking, oxidation, and chemical attack, making them ideal for critical industrial applications. Their high strength, hardness, and corrosion resistance combine to provide long-lasting reliability in harsh environments.
| Element | B8 CL5 | B8 CL5 | B8M CL5 |
| 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% |
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min |
| B8 CL5 | 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 CL5 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M CL5 Class 1 | All | 75 | 30 | 30 | 50 |
| B8 CL5 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 | |
| B8M CL5 Class 2 | Up to 3/4 | 110 | 95 | 15 | 45 |
| 7/8 – 1 | 100 | 80 | 20 | 45 | |
| 1-1/8 – 1-1/4 | 95 | 65 | 25 | 45 | |
| 1-3/8 – 1-1/2 | 90 | 50 | 30 | 45 |
Material | Specification | Standards | Size | Length |
ASTM A193 B8 CL5 Stud Bolt
| IS BS ASTM | DIN, ISO, JIS, GB, IS, BS, ASTM | M 02 to M 160 | 3 mm to 200 mm |
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ASTM A193 B8 CL5 Stud Bolts are extensively used in industries that demand high-strength, corrosion-resistant fasteners. They are ideal for high-pressure piping systems, flanged joints, boilers, heat exchangers, pressure vessels, and turbine assemblies in petrochemical plants, refineries, and power generation facilities. Their superior mechanical properties also make them suitable for marine structures, offshore platforms, and chemical processing equipment exposed to corrosive environments. Additionally, these stud bolts are used in food, pharmaceutical, and water treatment industries for their hygienic and non-reactive characteristics. Their durability and reliability ensure secure, long-term fastening in critical and high-stress applications.
At Rinku Fasteners, ASTM A193 B8 CL5 stud bolts are meticulously packaged to ensure safe delivery and maintain product integrity. Each stud bolt is individually inspected and protected with anti-corrosion coatings before being securely packed in sturdy, labeled boxes or crates. Custom packaging options are available to meet specific requirements. Our packaging process safeguards against damage during transit, ensuring that you receive high-quality, ready-to-use fasteners that meet your exacting standards.
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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