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ASTM A193 B8 CL5 Bolts are high-performance stainless steel fasteners engineered for demanding industrial applications requiring maximum strength and corrosion resistance. Manufactured from austenitic stainless steel in a Class 5 strain-hardened condition, these bolts provide superior mechanical properties compared to standard B8 or 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, rigorous quality control, and adherence to international standards, ASTM A193 B8 CL5 Bolts ensure reliable, long-term performance, making them a trusted choice for critical and safety-sensitive operations.
ASTM A193 B8 CL5 Bolts are made from austenitic stainless steel, typically Grade 304, enhanced through Class 5 strain-hardening for exceptional tensile and yield strength. The chromium and nickel content ensures excellent corrosion resistance and oxidation stability. These bolts exhibit improved hardness, strong ductility, and resistance to stress corrosion cracking. Their mechanical properties remain stable under high-pressure, high-temperature, and corrosive conditions, making them suitable for critical industrial fastening applications. The Class 5 condition offers significantly higher mechanical performance than standard B8, CL2, CL3, or CL4 fasteners.
| 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 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 Bolts are extensively used in industries where superior strength, durability, and corrosion resistance are critical. 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 strain-hardened structure allows them to withstand thermal cycling, steam exposure, and chemically aggressive environments. Marine and offshore structures also rely on these bolts for long-term reliability. Additionally, they are used in pharmaceutical, food processing, and water treatment equipment due to their hygienic and non-reactive properties, ensuring secure and dependable fastening in critical applications.
At Rinku Fasteners, we ensure that ASTM A193 B8 CL5 bolts are expertly packaged to preserve their quality and prevent damage during transit. Each bolt is carefully inspected and coated with anti-corrosion treatments before being packed in robust, labeled boxes or crates. Our packaging is designed to meet specific client requirements and safeguard the bolts from environmental factors. With attention to detail and precision, we guarantee that your 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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