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The Fasteners Mart, a Mumbai-based leading manufacturer and supplier, is a specialist in delivering high-quality fastening solutions to industries across the country. Known for precision and reliability, the company deals in a variety of products, such as ASTM A193 B8 Stud Bolts—designed to adhere to strict industrial standards. The stud bolts are perfect for high-temperature and high-pressure applications, guaranteeing reliability in critical conditions. Committed to excellence, The Fasteners Mart provides better products supported by skilled expertise, serving the petrochemical, building, and engineering industries throughout India.
ASTM A193 B8 Stud Bolts consist of AISI 304 stainless steel with a chemical content of approximately 18% chromium and 8% nickel, with an added benefit of high corrosion resistance. The fasteners are solution-annealed and strain-hardened for added strength and durability. They possess a minimum tensile strength of 75 ksi (515 MPa), yield strength of 30 ksi (205 MPa), and excellent elongation and hardness characteristics. Optimized for operating in high-pressure and temperature, B8 stud bolts are widely used in petrochemical, power plant, and industrial applications requiring sturdy and corrosion-proof fasteners.
| 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 B8 StudBolt
|
IS
BS
ASTM
|
DIN, ISO, JIS, GB, IS, BS, ASTM |
M 02 to M 160
|
3 mm to 200
|
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 Stud Bolts are extensively utilized where high strength and corrosion resistance are required, especially under high pressure and high temperature conditions. With practical applications in the petrochemical, oil and gas, power generation, and marine industries, these stud bolts are ideal for use in flanged jointing, pressure vessels, heat exchangers, and pipe systems. Resist corrosion and oxidation from chemical corrosion since they contain composition of stainless steel, they hold up in severe conditions and show long term durability. They also find widespread applications in the infrastructure and building industries where there are demands for quality and long-lasting fasteners with delivery of structure integrity and safety in onshore and offshore structures.
ASTM A193 B8 Stud Bolts are properly packaged to ensure protection during transit and storage. Each batch is properly wrapped up in wooden boxes, cartons, or pallets with proper labeling for easy identification. For quality and conformity, these bolts undergo rigorous tests, including mechanical, chemical, hardness, and dimensional testing. Further non-destructive testing (NDT) and third-party inspection are also available on request, so that each stud bolt conforms to international standards and customer-specific specifications for performance and safety.
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