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ASTM A193 B8 Class 5 stud bolts symbolize elite engineering strength — forged from specially heat-treated 304 stainless steel to conquer harsh industrial realities where standard fasteners surrender. At Hazlewood Fasteners in Canberra, Australia, we deliver B8 Class 5 stud bolts designed for mission-critical bolting systems where thermal punishment, corrosive atmospheres, and unrelenting pressure test every component. These stud bolts boast exceptional tensile fortitude and dimensional precision, anchoring heavy-duty assemblies in refineries, steam plants, offshore rigs, and chemical units with faultless reliability. When enduring strength and steadfast corrosion immunity define success, B8 CL5 stud bolts stand unshaken.
Engineered from high-purity 304 stainless steel and enhanced through elevated heat-treatment cycles, ASTM A193 B8 CL5 stud bolts deliver amplified tensile strength, superior creep resistance, and long-term fatigue endurance. Their chromium-nickel austenitic structure resists oxidation, stress corrosion, and thermal distortion, ensuring mechanical stability even under punishing cyclic temperatures and high-pressure conditions. Precision threading and strain-hardened metallurgy guarantee unwavering torque retention, exceptional clamping force, and dependability across continuous industrial duty cycles — a fusion of metallurgical refinement and mechanical dominance.
| 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 indispensable in demanding industrial installations where enhanced stainless strength and corrosion endurance are mandatory. Commonly deployed across petrochemical complexes, power-generation networks, marine infrastructure, high-pressure steam systems, and refinery equipment, they secure critical components such as flanges, turbines, heat exchangers, boiler units, valves, and reactor assemblies. Their fortified stainless chemistry ensures stability through chemical exposure, moisture-laden atmospheres, and thermal extremes. When engineering teams require anchored certainty in environments that punish weaker alloys, B8 Class 5 stud bolts deliver steadfast, high-performance fastening integrity.
At Hazlewood Fasteners, ASTM A193 B8 CL5 stud bolts are meticulously packaged to ensure safe delivery and maintain product integrity. Each stud bolt is individually inspected and protected with anti-corrosion coatings before being securely packed in sturdy, labeled boxes or crates. Custom packaging options are available to meet specific requirements. Our packaging process safeguards against damage during transit, ensuring that you receive high-quality, ready-to-use fasteners that meet your exacting standards.
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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