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ASTM A193 B8 Class 4 bolts are engineered for environments where ordinary stainless steel is simply not enough — forged from strain-hardened 304 stainless and built to operate under punishing thermal and corrosive extremes. Hazlewood Fasteners, based in Canberra, Australia, delivers these elite-grade bolts to industries where reliability must be unshakeable and strength uncompromised. With elevated tensile performance and impeccable corrosion resistance, B8 CL4 bolts secure critical industrial equipment across petrochemical plants, refinery circuits, steam systems, and marine infrastructures. When demanding conditions seek to erode performance and structural assurance, these bolts stand steadfast, delivering unwavering durability and precision.
ASTM A193 B8 Class 4 bolts are crafted from premium 304 stainless steel and strengthened through rigorous strain-hardening — resulting in heightened tensile strength, superior hardness, and exceptional stress-corrosion resistance. Their chromium-nickel austenitic structure shields against oxidizing chemical environments and sustained heat exposure. With refined thread precision and controlled grain structure, these bolts deliver high clamping force, secure torque retention, and fatigue-resistant performance under continuous thermal and mechanical loads. Built to endure where pressure, heat, and corrosive forces collide, they represent a masterclass in stainless fastening excellence.
| 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 chosen for engineering environments where high strength and enhanced stainless corrosion protection are mandatory. They are widely used in refinery piping, chemical processing units, power generation systems, pressure vessels, boiler assemblies, marine fittings, and heat-exchanger networks. Ideal for securing flanges, pumps, turbines, valves, steam lines, and structural supports, these bolts provide confident fastening stability in wet, chemical-laden, and high-temperature environments. When operational demand is extreme and fastener reliability cannot falter, B8 Class 4 bolts provide steadfast performance, securing critical infrastructure with unmatched resilience and confidence.
At Hazlewood Fasteners, ASTM A193 B8 CL4 bolts are meticulously packaged to ensure safe and secure delivery. Each bolt is individually inspected and then packed in high-quality, protective materials to prevent damage during transit. Our packaging includes clear labeling with detailed specifications and batch information, facilitating easy identification and traceability. We offer flexible packaging options to meet customer requirements, ensuring that the bolts arrive in optimal condition for immediate use in your critical applications.
Hazlewood Fasteners is a leading manufacturer and supplier of high-quality fasteners in Canberra, Australia, with over 8 years of experience serving global industries.
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