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As a reputable manufacturer and supplier of ASTM A193 B8 CL3 Stud Bolts, Punit Fasteners provides high-strength, corrosion-resistant fastening solutions to industrial sectors in Delhi and throughout India. The AISI 304 stainless steel used to make these stud bolts has undergone special processing to satisfy Class 3 requirements, which include carbide solution treatment and strain hardening. They are well-known for their exceptional corrosion resistance and superior tensile strength, making them perfect for use in demanding and hot conditions. To satisfy a range of industrial and engineering requirements, Punit Fasteners provides these bolts in a variety of sizes, thread forms, and finishes.
| 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 |
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The AISI 304 stainless steel used to make ASTM A193 B8 CL3 Stud Bolts has been strain-hardened to increase its mechanical strength. With regulated levels of carbon, manganese, and silicon, the chemical composition is primarily composed of iron, nickel, and chromium (18–20%). Class 3 bolts are cold worked and treated with carbide solution to increase their mechanical strength. A minimum tensile strength of 960 MPa, a yield strength of 720 MPa, and at least 14% elongation are typical mechanical characteristics. These properties make them ideal for high-stress and corrosive applications requiring dependable performance.
The oil and gas, chemical processing, power generation, and pharmaceutical industries all make extensive use of ASTM A193 B8 CL3 Stud Bolts, particularly in settings where strength and corrosion resistance are essential. They are perfect for use in boiler assemblies, heat exchangers, pressure vessels, valves, and pipeline flanges that operate at high temperatures and pressures. They are especially well-suited for dynamic loading and thermal cycling conditions due to their improved tensile characteristics. Punit Fasteners offers these stud bolts in both standard and customised specifications, guaranteeing strong, durable connections under harsh service circumstances that include heating, mechanical stress, and aggressive chemicals.
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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