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Rinku Fasteners, a trusted manufacturer and supplier based in Kolkata, India, proudly offers high-quality ASTM A193 B8 CL4 Bolts designed for demanding industrial environments. With decades of expertise and a strong commitment to excellence, we produce fasteners that deliver superior strength, corrosion resistance, and long-term reliability. Our ASTM A193 B8 CL4 Bolts undergo strict manufacturing and testing processes to meet international standards, ensuring consistent performance in high-pressure and high-temperature applications. Clients across chemical plants, power sectors, refineries, and marine industries rely on Rinku Fasteners for dependable products, timely delivery, and a seamless service experience.
ASTM A193 B8 CL4 Bolts are made from AISI 304 stainless steel in a strain-hardened Condition CW4, which enhances their tensile strength and hardness. Their composition includes chromium and nickel, offering excellent corrosion resistance and durability. The CL4 condition provides significantly higher mechanical properties than standard B8 grades, making them suitable for critical bolting applications. These bolts exhibit strong tensile and yield strength, improved ductility, and dependable resistance to oxidation. Their stable mechanical performance under varying temperatures ensures reliability in both corrosive and high-stress environments.
| Element | B8 CL4 | B8 CL4 | B8M CL4 |
| 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 CL4 | 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 CL4 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M CL34Class 1 | All | 75 | 30 | 30 | 50 |
| B8 CL4 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 CL4 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 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 bolts are used in demanding environments such as petrochemical plants, power generation, and high-pressure vessels. They are ideal for applications requiring high strength and resistance to high temperatures and corrosive conditions. Commonly found in flanged joints, pressure vessels, and heavy machinery, these bolts provide reliability and durability in critical industrial settings. Their robust properties make them suitable for both maintenance and new installations in challenging operational environments.
ASTM A193 B8 CL4 Bolts are widely used in industries that require strong, corrosion-resistant, and strain-hardened stainless steel fasteners. They are extensively utilized in chemical processing plants, oil and gas refineries, petrochemical units, food processing equipment, and high-pressure piping systems. Their superior mechanical strength makes them ideal for flanged joints, heat exchangers, pressure vessels, and valve assemblies. These bolts perform exceptionally well in corrosive and high-temperature environments, ensuring safe and secure fastening in critical service conditions. Because of their enhanced strength and durability, ASTM A193 B8 CL4 Bolts are preferred for long-term industrial reliability.
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