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ASTM A193 B8 Class 3 bolts are premium fasteners manufactured from strain-hardened 304 stainless steel, designed for superior strength and durability in high-pressure and high-temperature industrial environments. At Hazlewood Fasteners in Canberra, Australia, we supply top-grade B8 Class 3 bolts engineered for demanding bolting applications where exceptional mechanical integrity and corrosion resistance are essential. These bolts provide superior tensile properties compared to standard B8 bolts, ensuring reliable performance in corrosive, thermal, and mechanical stress conditions. Ideal for industrial piping, pressure vessels, heat exchangers, and chemical processing systems, they ensure long-term security and structural stability in critical installations.
ASTM A193 B8 Class 3 bolts are produced from solution-annealed and strain-hardened 304 stainless steel, offering enhanced tensile and yield strength. With austenitic chromium-nickel composition, they deliver excellent corrosion resistance in water-based, chemical, and chloride-bearing environments. These bolts maintain structural strength under thermal fluctuations, vibration, and mechanical stress, providing dependable load-bearing and fatigue performance. Precision-machined threading and robust dimensional tolerances ensure superior torque, clamping stability, and long-service reliability, making them suited for extreme industrial duty cycles.
| 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 CL3 Bolt
|
IS
BS
ASTM
|
DIN, ISO, JIS, GB, IS, BS, ASTM |
M 02 to M 160
|
3 mm to 200 mm
|
To satisfy our clients needs by providing high quality products at competitive price as per the schedule and to maintain long term relationship with our clients.
ASTM A193 B8 Class 3 bolts are widely used in industries requiring high-strength, corrosion-resistant bolting solutions. Typical applications include oil and gas facilities, petrochemical plants, marine structures, power generation units, boiler systems, steam pipelines, and refinery equipment. They are ideal for securing flanges, pumps, valves, turbines, pressure vessels, and high-temperature processing equipment. Thanks to their strain-hardened design and stainless-steel chemistry, these bolts ensure consistent performance in corrosive marine atmospheres, chemical exposure zones, and high-pressure steam service, offering long-term fastening integrity for critical industrial installations.
At Hazlewood Fasteners, we ensure that our ASTM A193 B8 CL3 bolts are meticulously packaged to maintain their integrity and quality during transit. Each bolt is carefully inspected and packed in sturdy, corrosion-resistant materials to prevent damage. Our packaging solutions include custom labeling and secure sealing, guaranteeing safe delivery and easy identification. Whether shipped locally or internationally, our packaging standards meet all regulatory requirements, ensuring our bolts arrive in perfect condition, ready for immediate use in your projects.
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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