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ASTM A193 B8 CL4 Stud Bolts are engineered to deliver exceptional strength, reliability, and corrosion resistance in demanding industrial environments. Manufactured from high-quality stainless steel in a strain-hardened condition, these stud bolts are ideal for high-pressure and high-temperature applications where performance cannot be compromised. Their enhanced mechanical properties make them suitable for critical bolting in chemical plants, refineries, power generation units, and marine systems. Trusted for their durability and precision, ASTM A193 B8 CL4 Stud Bolts provide long-term stability, ensuring safe and secure fastening even in corrosive or fluctuating temperature conditions.
ASTM A193 B8 CL4 Stud Bolts are manufactured from AISI 304 stainless steel in the CW4 (Class 4) strain-hardened condition. The alloy comprises chromium and nickel, offering excellent corrosion and oxidation resistance. Through controlled cold working, these fasteners achieve significantly higher tensile and yield strength compared to the standard B8 grade. They exhibit improved hardness, reliable ductility, and strong resistance to mechanical stress. These balanced properties enable ASTM A193 B8 CL4 Stud Bolts to perform efficiently under high pressure, thermal variations, and corrosive industrial atmospheres.
| Element | B8 CL3 | B8 CL3 | B8M CL3 |
| 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 CL3 | 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 CL3 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M CL3 Class 1 | All | 75 | 30 | 30 | 50 |
| B8 CL3 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 CL3 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 CL4 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 CL4 Stud Bolts are widely used in industries where superior strength and corrosion resistance are essential. They are commonly installed in chemical processing plants, petrochemical units, oil and gas refineries, marine structures, and power generation systems. Ideal for flanged connections, pressure vessels, heat exchangers, valve assemblies, and high-pressure piping, these stud bolts offer dependable fastening in harsh environments. Their strain-hardened structure ensures they retain integrity under thermal cycling, steam exposure, and corrosive chemicals. Because of their high durability and consistent performance, ASTM A193 B8 CL4 Stud Bolts are preferred for long-term, critical applications.
At Rinku Fasteners, we prioritize the secure packaging of our ASTM A193 B8 CL4 stud bolts to ensure they reach you in optimal condition. Each stud bolt is carefully inspected and packaged using robust, protective materials to prevent damage during transit. Our packaging solutions include detailed labeling for easy identification and handling. Whether you’re ordering small quantities or bulk, we provide customized packaging options to meet your needs, guaranteeing the safe and efficient delivery of your fasteners.
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