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At Rinku Fasteners, we are committed to delivering fastening solutions that combine reliability, strength, and long-term performance. As a renowned manufacturer and supplier in Kolkata, India, we offer premium ASTM A193 B8 CL3 Fasteners, engineered to meet the highest industrial standards. These fasteners are designed for demanding environments where corrosion resistance and mechanical stability are crucial. With advanced manufacturing processes and quality-driven practices, we ensure every fastener performs consistently, even under high pressure and temperature. Our focus on precision and customer satisfaction helps industries operate with enhanced safety and efficiency.
ASTM A193 B8 CL3 Fasteners are made from austenitic stainless steel, predominantly Grade 304, containing chromium and nickel for superior corrosion resistance. Unlike standard grades, Class 3 fasteners undergo carbide-solution treatment without strain hardening, resulting in controlled mechanical properties. They exhibit good tensile and yield strength, dependable ductility, and excellent stability at elevated temperatures. Their resistance to stress corrosion cracking, oxidation, and chemical attack ensures reliable performance in harsh environments. This combination of balanced strength and corrosion resistance makes them suitable for critical industrial applications.
| Element | B7 | B8 CL3 | B8 CL3M |
| 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 CL3 Class 1 | All | 75 | 30 | 30 | 50 |
| B8 CL3M Class 1 | All | 75 | 30 | 30 | 50 |
| B8 CL3 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 | |
| B8 CL2M Class 3 | Up to 3/4 | 110 | 95 | 15 | 45 |
Material | Specification | Standards | Size | Length |
ASTM A193 B8 CL3 Fasteners | IS BS ASTM | DIN, ISO, JIS, GB, IS, BS, ASTM | M 02 to M 160 | 3 mm to 200 mm |
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ASTM A193 B8 CL3 Fasteners are widely used in sectors where corrosion resistance and stable mechanical performance are essential. They are commonly installed in boilers, heat exchangers, pressure vessels, and high-temperature piping systems across power plants and petrochemical facilities. Chemical processing units depend on them for equipment exposed to corrosive fluids and thermal cycling. Their hygienic, non-reactive nature also suits food, beverage, and pharmaceutical industries. Additionally, these fasteners are utilized in water treatment plants, marine structures, structural assemblies, and general industrial machinery. Their reliability ensures safe, durable fastening in both standard and demanding environments.
At Rinku Fasteners, we prioritize the safe and efficient packaging of ASTM A193 B8 CL3 fasteners. Each fastener is meticulously inspected and securely packaged in durable, protective materials to prevent damage during transit. Our packaging is designed to maintain the integrity and quality of the fasteners, ensuring they arrive in optimal condition. We offer customized packaging solutions to meet specific customer requirements, reflecting our commitment to excellence and customer satisfaction.
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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