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Mazin Fasteners, located in Muscat, Oman, has built a solid reputation as a reliable manufacturer and supplier of top-notch industrial fasteners. They specialize in ASTM A193 B8 CL4 Bolts, which are essential for critical applications. These bolts are crafted to adhere to strict international standards, ensuring they deliver reliability, precision, and consistent performance. Designed to thrive in high-temperature and high-pressure settings, ASTM A193 B8 CL4 Bolts find their way into various industries, including oil and gas, petrochemical, power generation, and heavy engineering. With a strong focus on quality control, Mazin Fasteners guarantees that these bolts are a trustworthy choice for even the most demanding industrial projects.
Made from austenitic stainless steel, ASTM A193 B8 CL4 Bolts boast a chemical makeup rich in chromium and nickel, which gives them outstanding resistance to corrosion and oxidation. The Class 4 designation signifies a higher strength achieved through strain hardening, resulting in improved tensile and yield strength compared to standard B8 grades. These bolts are known for their toughness, fatigue resistance, and stability at elevated temperatures, making them perfect for applications where strength, durability, and resilience against harsh conditions are crucial.
| 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.
You’ll often find ASTM A193 B8 CL4 Bolts in flanges, pressure vessels, pipelines, valves, and high-temperature equipment. They excel in environments exposed to heat, vibration, and corrosive substances, particularly in chemical plants, refineries, and power stations. Their superior strength and corrosion resistance ensure secure bolted joints and a long service life. Engineers and contractors often turn to these bolts for critical assemblies where safety, performance, and reliability are non-negotiable in challenging industrial settings.
Mazin Fasteners is a leading manufacturer and supplier of high-quality fasteners in Muscat, OMAN, with over 8 years of experience serving global industries.
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