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Rinku Fasteners, located in Kolkata, India, has built a solid reputation as a reliable manufacturer and supplier of top-notch industrial fasteners, including ASTM A193 B7 Bolts. These bolts are crafted with precision engineering and exceptional strength, making them perfect for high-stress and high-temperature applications. Rinku Fasteners is committed to strict quality control, ensuring that their fasteners are durable and dependable, meeting international standards. ASTM A193 B7 Bolts are particularly suited for critical roles in power plants, petrochemical facilities, and construction projects, where safety and performance are crucial. With outstanding tensile strength and durability, these bolts offer secure and long-lasting fastening solutions for challenging engineering tasks.
ASTM A193 B7 Bolts are crafted from medium carbon alloy steel, typically featuring 0.37–0.44% carbon, 0.75–1.00% manganese, along with trace elements of silicon, phosphorus, and sulfur. They undergo a quenching and tempering process to boost their performance. These bolts showcase impressive tensile strength (minimum of 125 ksi), remarkable hardness, and excellent fatigue resistance, making them ideal for high-pressure and high-temperature settings. They maintain their shape under stress and resist deformation, ensuring secure fastening in critical applications. Their mechanical properties make them perfect for demanding industrial and structural uses that require reliability and strength.
Material | Specification | Standards | Size | Length |
ASTM A193 B7 Bolt | IS BS ASTM | DIN, ISO, JIS, GB, IS, BS, ASTM | M 02 to M 160 | 3 mm to 200 mm |
| 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 |
| 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% |
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ASTM A193 B7 Bolts find extensive use in industries that need high-strength, heat-treated fasteners capable of enduring extreme conditions. You’ll often see them in power generation plants, petrochemical refineries, oil and gas pipelines, boilers, pressure vessels, and heavy machinery assemblies. Their remarkable tensile strength, hardness, and resistance to creep under high temperatures make them indispensable in these settings. Whether it’s for construction or maintenance, these bolts are designed to perform reliably, ensuring safety and efficiency in various demanding applications.
Introducing Rinku Fasteners’ ASTM A193 B7 Bolts, engineered for superior strength and durability. These high-performance bolts are crafted from high-alloy steel, ideal for demanding applications in extreme temperatures and high-pressure environments. Each bolt meets stringent ASTM standards, ensuring exceptional reliability and safety. Packaged securely to prevent damage, our fasteners come with clear labeling for easy identification. Trust Rinku Fasteners for unmatched quality and performance in every project.
Rinku Fasteners is a leading manufacturer and supplier of high-quality fasteners in Kolkata, India, with over 8 years of experience serving global industries.
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