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At Rinku Fasteners, we are dedicated to producing high-quality fastening solutions that meet the needs of modern industries. As a trusted manufacturer and supplier in Kolkata, India, we offer premium ASTM A193 B8 CL2 Fasteners, engineered for strength, durability, and excellent corrosion resistance. These stainless steel fasteners are solution-treated and strain-hardened to perform reliably in demanding, high-temperature, and corrosive environments. With a commitment to accuracy, consistency, and customer satisfaction, we provide products that help industries operate more safely and efficiently. Our focus on quality ensures lasting performance in critical applications.
ASTM A193 B8 CL2 Fasteners are made from austenitic stainless steel, commonly Grade 304, enriched with chromium and nickel for superior corrosion resistance. They undergo carbide-solution treatment followed by controlled strain hardening to achieve Class 2 mechanical strength. These fasteners offer higher tensile and yield strength compared to standard B8 grades while maintaining good ductility and hardness. Their structure provides resistance to oxidation, stress corrosion cracking, and thermal fatigue. Stable performance under elevated temperatures makes them suitable for high-pressure and high-stress industrial environments.
| Element | B7 | B8 CL2 | B8 CL2M |
| 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 CL2 Class 1 | All | 75 | 30 | 30 | 50 |
| B8 CL2M Class 1 | All | 75 | 30 | 30 | 50 |
| B8 CL2 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 2 | Up to 3/4 | 110 | 95 | 15 | 45 |
|
Material |
Specification |
Standards |
Size
|
Length |
|
ASTM A193 B8 CL2 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 CL2 Fasteners are widely used in industries that demand both corrosion resistance and enhanced mechanical strength. They are ideal for pressure vessels, boilers, heat exchangers, and high-temperature piping systems in power generation and petrochemical facilities. Their durability makes them suitable for refineries, chemical processing equipment, and fertilizer plants handling corrosive media. Food and pharmaceutical industries value them for their hygienic and non-reactive properties. These fasteners are also utilized in water treatment units, marine structures, structural assemblies, and general industrial machinery where long-term reliability and safety are essential.
At Rinku Fasteners, the ASTM A193 B8 CL2 fasteners are carefully packaged to ensure they reach you in pristine condition. Each binder is carefully packaged in durable, corrosion-resistant packaging to prevent damage during transport. Clear labeling on each product ensures easy identification and follow-up. We offer customizable packaging to meet your specific needs, ensuring convenience and efficiency in handling and storage. Trust Rinku Fasteners provide safe, reliable delivery of critical fastening solutions.
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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