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Punit Fasteners, a leading manufacturer and supplier located in Delhi, India, specializes in high-quality ASTM A193 B8 Stud Bolts designed for high-temperature and high-pressure applications. Crafted from austenitic stainless steel (Type 304), these stud bolts provide outstanding corrosion resistance and mechanical strength, making them perfect for critical uses in the petrochemical, oil & gas, and power generation sectors. Built to meet ASTM A193 standards, our B8 stud bolts guarantee precise dimensions, heat resistance, and long-lasting performance. With a strong focus on quality, customization, and timely delivery, Punit Fasteners has become a reliable source for fastening solutions in India and beyond.
ASTM A193 B8 Stud Bolts are constructed from Type 304 stainless steel, which contains 18–20% chromium and 8–11% nickel, ensuring excellent corrosion resistance across various environments. These bolts undergo carbide solution treatment (annealing) and can also be strain-hardened to meet higher strength needs. Their mechanical properties include a minimum tensile strength of 515 MPa and a yield strength of 205 MPa, along with good elongation and toughness. Capable of withstanding temperatures up to 870°C, B8 stud bolts deliver dependable performance in corrosive, high-temperature, and pressure-loaded assemblies typically found in chemical and industrial facilities.
| 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 widely used in industries requiring high-strength and corrosion-resistant fastening solutions. Key applications include petrochemical plants, oil and gas refineries, and power generation facilities. These bolts are essential for securing pressure vessels, flanges, valves, and pipeline assemblies in high-temperature and high-pressure environments. Their superior durability and reliability make them ideal for critical operations, ensuring safety and stability in demanding conditions. Choose ASTM A193 B8 Stud Bolts for dependable performance in challenging industrial applications.
ASTM A193 B8 Stud Bolts are commonly utilized in flanged connections and pressure-rated systems within oil refineries, chemical plants, thermal and nuclear power stations, and marine settings. These bolts are perfect for securing pipe flanges, valves, and equipment where corrosion resistance and high strength are crucial. Their application is especially vital in systems that encounter steam, chemicals, acids, and saline conditions. Punit Fasteners provides B8 stud bolts in a variety of thread types (UNC, UNF, metric), lengths, and finishes, with optional PTFE or passivation treatments available to enhance performance.
Punit Fasteners is a leading manufacturer and supplier of high-quality fasteners in Delhi, India, with over 15 years of experience serving global industries.
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