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ASTM A193 B8C bolts are engineered for industrial arenas where heat, corrosion, and mechanical intensity demand absolute precision and unwavering strength. Manufactured from 347 stainless steel — stabilized with niobium/columbium for superior high-temperature resistance — these bolts are the trusted choice for thermal-critical and chemically volatile environments. At Hazlewood Fasteners in Canberra, Australia, we deliver B8C bolts crafted to perform under relentless stress, ensuring secure, enduring connections in refinery pipelines, energy systems, and corrosive process plants. When performance cannot falter and durability must be absolute, B8C bolts command the battlefield with resolute strength and metallurgical sophistication.
ASTM A193 B8C bolts are produced from columbium-stabilized 347 stainless steel, delivering advanced resistance to carbide precipitation and intergranular corrosion at elevated temperatures. Their chromium-nickel matrix ensures robust oxidation defense, while strain-hardening or heating treatments elevate tensile and yield strength for aggressive industrial conditions. Engineered for sustained performance under persistent temperature cycling, chemical exposure, and mechanical load, these bolts offer superior creep resistance, outstanding torque retention, and dimensional stability — guaranteeing strength and reliability in demanding, long-duration service environments.
| Element | B7 | B8 | B8M |
| 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 |
| B7 | 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 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M Class 1 | All | 75 | 30 | 30 | 50 |
| B8 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 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 B8C 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 B8C bolts are deployed where corrosion, temperature swings, and mechanical fatigue converge. These bolts are preferred for high-temperature pipelines, refinery stacks, gas turbines, heat exchangers, boiler systems, chemical reactors, and pressure-critical flanged joints. Their 347 stainless composition makes them ideal for petrochemical facilities, power-generation infrastructure, marine engineering setups, and thermal processing equipment. Designed for environments where standard stainless alloys weaken, B8C bolts maintain fastening integrity with disciplined strength and resistance — a dependable fastening solution for engineers who expect absolute endurance and precision under punishing industrial demands.
At Hazlewood Fasteners, we prioritize the secure and efficient packaging of ASTM A193 B8C bolts to ensure their safe delivery and optimal condition upon arrival. Each bolt is carefully packed in high-quality, durable containers that protect against damage and contamination. Our packaging includes clear labeling for easy identification and handling. We offer customized packaging solutions to meet specific client needs, ensuring that every order arrives intact and ready for use in demanding industrial 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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