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Aria Fasteners, based in Hamilton, New Zealand, stands out as a top manufacturer and supplier of high-performance ASTM A193 B8 CL4 Bolts, specifically crafted for critical industrial applications. With a keen emphasis on engineering precision and adherence to international quality standards, the company serves various sectors, including petrochemical, power generation, construction, and marine industries. Utilizing cutting-edge production technologies and rigorous quality assurance processes, Aria Fasteners guarantees exceptional reliability and durability in every product. Their dedication to customer satisfaction, technical know-how, and prompt service has established them as a go-to source for premium stainless-steel bolting solutions throughout New Zealand and beyond.
ASTM A193 B8 CL4 Bolts are crafted from 304 stainless steel that undergoes a specialized solution annealing process, followed by enhanced strain-hardening to achieve remarkable mechanical properties. These bolts contain 18–20% chromium, 8–11% nickel, low carbon content, and carefully controlled amounts of silicon, manganese, sulfur, and phosphorus, which together provide outstanding corrosion resistance. The Class 4 specification boasts even higher tensile and yield strength compared to Class 3, thanks to more stringent hardening processes. As a result, these bolts exhibit high hardness, excellent stress resistance, and superior performance in environments rich in chlorides and at elevated temperatures.
| 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 extensively utilized in demanding industrial systems where exceptional strength and corrosion resistance are crucial. Their enhanced strain-hardened properties make them perfect for high-pressure and high-temperature applications. You’ll find these bolts in pressure vessels, reactors, boilers, flanged joints, pumps, and valve assemblies across chemical plants, refineries, power stations, and offshore installations. They are also a reliable choice for marine and coastal projects, thanks to their durability.
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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