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ASTM A193 B8 Class 4 stud bolts are engineered for high-demand industrial environments where strength, corrosion resistance, and thermal endurance are absolute requirements. Manufactured from meticulously strain-hardened 304 stainless steel, these studs deliver amplified durability and precision under corrosive and high-temperature operating conditions. Hazlewood Fasteners in Canberra, Australia supplies B8 CL4 stud bolts built for mission-critical installations across petrochemical facilities, energy stations, steam networks, and marine systems. When process environments intensify and structural reliability becomes non-negotiable, these stud bolts provide unwavering fastening integrity — securing heavy-duty equipment with refined force, metallurgical excellence, and long-cycle stability.
Crafted from solution-treated and strain-hardened 304 stainless steel, ASTM A193 B8 Class 4 stud bolts feature elevated tensile strength, remarkable corrosion resistance, and heightened hardness for extreme service conditions. Their chromium-nickel austenitic structure offers superior defense against oxidation, moisture-rich atmospheres, and corrosive industrial media. With refined grain structure and accurate thread geometry, these stud bolts ensure consistent torque retention, high clamp force, and outstanding fatigue resistance under thermal cycling and vibration. Purpose-built for reliability, they deliver confidence in environments where mechanical stability cannot falter.
| Element | B8 CL3 | B8 CL3 | B8M CL3 |
| 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 CL3 | 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 CL3 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M CL3 Class 1 | All | 75 | 30 | 30 | 50 |
| B8 CL3 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 CL3 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 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 CL4 stud bolts are deployed in environments where enhanced stainless-steel strength and corrosion security are essential. Common applications include petroleum refineries, power-generation units, boiler systems, chemical processing networks, steam lines, offshore platforms, and high-pressure pipeline assemblies. They secure critical infrastructure such as pumps, flanges, valves, heat exchangers, turbines, and reactor vessels. Engineered to withstand demanding mechanical loads and corrosive atmospheres, these studs provide long-term fastening assurance. When engineers seek enduring strength under thermal shock, vibration, and chemical exposure, B8 CL4 stud bolts deliver uncompromised performance and lasting structural certainty.
At Hazlewood Fasteners, we prioritize the secure packaging of our ASTM A193 B8 CL4 stud bolts to ensure they reach you in optimal condition. Each stud bolt is carefully inspected and packaged using robust, protective materials to prevent damage during transit. Our packaging solutions include detailed labeling for easy identification and handling. Whether you’re ordering small quantities or bulk, we provide customized packaging options to meet your needs, guaranteeing the safe and efficient delivery of your fasteners.
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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