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Mazin Fasteners, located in Muscat, Oman, has earned a solid reputation as a reliable manufacturer and supplier of top-notch industrial fasteners, including the ASTM A193 B8 CL5 stud bolts. These bolts are crafted to adhere to strict international standards, guaranteeing precision, strength, and dependable performance even in the toughest industrial settings. Specifically designed for high-temperature and high-pressure applications, ASTM A193 B8 CL5 stud bolts find their place in industries like oil and gas, petrochemicals, power generation, and heavy engineering. At Mazin Fasteners, we blend cutting-edge manufacturing techniques with thorough quality control to provide fastening solutions that prioritize durability, safety, and long-lasting operational reliability.
Made from austenitic stainless steel that’s enriched with chromium and nickel, ASTM A193 B8 CL5 stud bolts boast impressive resistance to corrosion and oxidation. The Class 5 designation signifies a higher strength level achieved through cold working, which enhances both tensile and yield strength compared to the lower B8 classes. These bolts are known for their high toughness, fatigue resistance, and thermal stability, making them perfect for critical applications in harsh industrial environments, including those with elevated temperatures and high-pressure systems.
| 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 widely used in critical industrial applications requiring high strength and corrosion resistance. They are ideal for pressure vessels, heat exchangers, and piping systems in the oil and gas, chemical, and power generation industries. Their ability to withstand extreme temperatures and aggressive environments makes them suitable for applications like steam turbines, reactor vessels, and high-pressure valves. These stud bolts ensure secure and reliable connections in demanding operational settings.
You’ll often find ASTM A193 B8 CL5 stud bolts in flanged joints, pressure vessels, pipelines, valves, and heat exchangers. They’re particularly well-suited for chemical plants, refineries, power stations, and marine settings where strength, durability, and resistance to heat and corrosion are crucial. With their outstanding mechanical properties and extended service life, these bolts are the go-to choice for engineers and contractors looking for secure and trustworthy fastening solutions for essential industrial assemblies.
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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