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At Rinku Fasteners, we are committed to delivering fastening solutions that combine strength, precision, and long-term reliability. As a leading manufacturer and supplier in Kolkata, India, we offer high-grade ASTM A193 B8 CL4 Fasteners designed to meet stringent industrial standards. Crafted with care and backed by years of expertise, our fasteners ensure dependable performance in demanding applications such as chemical processing, power generation, and petrochemical environments. We focus on providing consistent quality, corrosion-resistant materials, and exceptional customer service, helping industries build safer and more efficient systems with fasteners they can trust.
ASTM A193 B8 CL4 Fasteners are made from austenitic stainless steel, typically Type 304, that has been carbide-solution treated and strain-hardened to achieve Class 4 strength levels. Their composition includes chromium and nickel, offering excellent corrosion resistance and oxidation stability. Mechanically, they provide high tensile strength, improved yield strength, and reliable hardness due to the strain-hardening process. These fasteners exhibit good ductility, resistance to stress corrosion cracking, and stable performance at elevated temperatures, making them suitable for critical high-pressure or high-temperature operations.
| Element | B8 CL4 | B8 CL4 | B8M CL4 |
| 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% |
|
Material |
Specification |
Standards |
Size |
Length |
|
ASTM A193 B8 CL4 Fasteners
|
IS
BS
ASTM
|
DIN, ISO, JIS, GB, IS, BS, ASTM |
M 02 to M 160
|
3 mm to 200 mm
|
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 CL4 Fasteners are widely used in industries that require strong, corrosion-resistant fastening systems. Their enhanced mechanical strength makes them ideal for high-pressure piping, boilers, heat exchangers, and turbine components in power plants. Chemical and petrochemical industries rely on them for equipment exposed to corrosive chemicals and high temperatures. They are also used in refineries, food processing equipment, water treatment facilities, and pharmaceutical machinery due to their hygienic and corrosion-resistant nature. From structural assemblies to critical process equipment, these fasteners ensure safety, durability, and stable performance in both standard and challenging operating environments.
At Rinku Fasteners, we ensure that our ASTM A193 B8 CL4 fasteners are packaged with the utmost care to maintain their quality during transit. Each fastener is individually inspected and then securely packed in durable, protective materials to prevent damage. Our packaging includes detailed labeling for easy identification and handling. Whether you need small quantities or bulk orders, we offer customized packaging solutions to meet your specific requirements, ensuring that your fasteners arrive in perfect condition.
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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