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Brian Fasteners is a well-respected manufacturer and supplier located in Houston, USA, specializing in high-performance ASTM A193 B8 Class 3 Stud Bolts. These bolts are designed for critical applications that demand exceptional strength and corrosion resistance. Crafted from top-quality austenitic stainless steel, they undergo a strain-hardening process to meet rigorous mechanical and service standards. With outstanding tensile and yield strength, ASTM A193 B8 Class 3 Stud Bolts are perfect for high-pressure and high-temperature bolting assemblies. Industries such as petrochemical, oil and gas, power generation, and marine trust Brian Fasteners for precise manufacturing, consistent quality, and reliable supply of certified fastening solutions.
ASTM A193 B8 Class 3 Stud Bolts are made from AISI 304 stainless steel and are strain-hardened to boost their strength. Their composition includes 18–20% chromium, 8–12% nickel, and the remainder is iron with controlled carbon content. These bolts boast a minimum tensile strength of 125 ksi (860 MPa) and a minimum yield strength of 100 ksi (690 MPa). The strain-hardening process also enhances hardness and fatigue resistance. They provide excellent corrosion resistance across various environments, including chemical processing, exposure to seawater, and high temperatures up to 593 °C (1100 °F).
| 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 |
Material | Specification | Standards | Size | Length |
ASTM A193 B8 CL3 StudBolt | 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 CL3 stud bolts are commonly used in high-temperature and high-pressure environments, such as in petrochemical, oil and gas, and power generation industries. They are ideal for critical applications requiring robust performance, including flanged joints, reactors, and pressure vessels. Their superior strength and corrosion resistance make them suitable for equipment exposed to extreme conditions, ensuring reliable and secure connections in demanding industrial settings.
At Brian Fasteners, ASTM A193 B8 CL3 stud bolts are meticulously packaged to ensure optimal protection during transit and storage. Each bolt is individually wrapped in anti-corrosive material and securely placed in durable, custom-sized boxes to prevent damage. The packaging is clearly labeled with product specifications and handling instructions for easy identification. Our commitment to careful packaging helps maintain the integrity and quality of the fasteners, ensuring they arrive in perfect condition and ready for use.
Brian Fasteners is a leading manufacturer and supplier of high-quality fasteners in Houston , USA, with over 8 years of experience serving global industries.
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