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Aria Fasteners, located in Hamilton, New Zealand, is your go-to source for top-notch ASTM A193 B8 CL5 bolts. These bolts are designed with strength, durability, and reliability in mind, making them perfect for high-pressure, high-temperature, and demanding industrial settings. At Aria Fasteners, we take pride in ensuring that each bolt meets rigorous quality standards, so you can trust that they will maintain their structural integrity, resist wear, and perform consistently even under heavy loads and vibrations. They’re especially suited for critical assemblies where safety, performance, and long-lasting reliability are a must.
Crafted from austenitic stainless steel, usually 316, ASTM A193 B8 CL5 bolts boast excellent corrosion resistance, impressive tensile strength, and outstanding toughness. The CL5 grade offers extra protection against chlorides, stress corrosion cracking, and oxidation, making these bolts ideal for use in chemical, petrochemical, offshore, and marine environments. Their mechanical stability under heavy loads, vibrations, and temperature fluctuations ensures secure fastening and reliable long-term performance.
| 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 crucial in industries requiring high strength and corrosion resistance. They are commonly used in pressure vessels, heat exchangers, and piping systems within the oil and gas, chemical, and power generation sectors. Their ability to perform reliably under extreme temperatures and aggressive environments makes them ideal for steam turbines, reactor vessels, and high-pressure valves. These bolts ensure secure and durable connections in high-stress applications, enhancing overall system safety and efficiency.
These bolts find their place in various industries, including chemical processing plants, oil and gas, power generation, and high-pressure piping systems. They’re perfect for flange connections, pressure vessels, and other critical bolted assemblies where corrosion resistance, strength, and reliability are key. When you choose ASTM A193 B8 CL5 bolts from Aria Fasteners, you’re opting for long-lasting durability, structural integrity, and reduced maintenance—making them the preferred choice for industries that demand dependable, high-quality fastening solutions.
Aria Fasteners is a leading manufacturer and supplier of high-quality fasteners in Hamilton, New Zealand, with over 8 years of experience serving global industries.
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