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At Rinku Fasteners, we specialize in delivering high-performance fastening solutions trusted across a wide range of industries. As a leading manufacturer and supplier in Kolkata, India, we proudly offer premium ASTM A193 B8 CL4 Fasteners, engineered for applications that demand exceptional strength and corrosion resistance. These fasteners are crafted with precision, ensuring consistent performance in high-pressure and high-temperature environments. With our commitment to quality, technical expertise, and customer-focused approach, we ensure every fastener meets stringent industry standards. Industries rely on our products for long-term durability, safety, and reliability in critical operations.
ASTM A193 B8 CL4 Fasteners are manufactured from austenitic stainless steel, typically Grade 304, containing chromium and nickel for reliable corrosion and oxidation resistance. Class 4 fasteners undergo carbide-solution treatment followed by a higher degree of strain hardening, giving them superior mechanical strength compared to lower classes. They offer higher tensile and yield strength, improved hardness, and stable ductility. Their resistance to chloride stress corrosion cracking and excellent performance at elevated temperatures make them ideal for demanding industrial applications requiring strength, durability, and chemical resistance.
| 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% |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
|
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 where both mechanical strength and corrosion resistance are critical. They are ideal for high-pressure piping systems, boilers, turbines, and heat exchangers in power plants. Petrochemical and refinery operations use them in equipment exposed to corrosive chemicals and elevated temperatures. Chemical processing facilities rely on them for reactors, pressure vessels, and flow control systems. They are also valued in water treatment, food processing, and pharmaceutical manufacturing due to their clean, non-reactive properties. These fasteners ensure dependable, long-term performance in environments where precision and safety are essential.
We ensure that our ASTM A193 B8 CL4 fasteners are carefully installed to ensure integrity during transit. Each packaging is individually inspected and then treated with preservatives to prevent corrosion. Our packaging includes clearly labeled boxes with detailed product information for easy identification and tracking. We prioritize safe and effective packaging to ensure our fasteners arrive in perfect condition, ready for immediate use on your critical projects.
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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