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Punit Fasteners stands out as a top-notch manufacturer and supplier located in Delhi, India, with a focus on producing high-quality ASTM A193 B8 CL4 Bolts. With years of experience in the fasteners industry, Punit Fasteners is dedicated to delivering products that adhere to strict international standards, serving various sectors like construction, petrochemicals, and power generation. Renowned for their reliability, precision engineering, and prompt delivery, the company has earned a solid reputation among clients both in India and overseas. Each bolt is meticulously crafted using cutting-edge technology and goes through thorough quality checks to guarantee optimal performance and durability, even in challenging environments.
The ASTM A193 B8 CL4 Bolts are made from Class 4 austenitic stainless steel, which is sourced from AISI 304 stainless steel, featuring controlled carbon content to enhance mechanical properties. These bolts are known for their exceptional corrosion resistance and are perfect for high-temperature applications. On the mechanical side, they boast a minimum tensile strength of 125 ksi and a yield strength of 100 ksi, along with commendable elongation and hardness values. Their chemical makeup includes chromium (18–20%), nickel (8–12%), and carefully regulated amounts of carbon, manganese, phosphorus, and sulfur, ensuring they are durable, strong, and resistant to environmental stress cracking and oxidation.
| 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% |
| Grade | Size | Tensile ksi, min | Yield, ksi, min | Elong, %, min | RA % min |
| B8 CL4 | 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 CL4 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M CL34Class 1 | All | 75 | 30 | 30 | 50 |
| B8 CL4 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 | |
| B8M CL4 Class 2 | Up to 3/4 | 110 | 95 | 15 | 45 |
| 7/8 – 1 | 100 | 80 | 20 | 45 | |
| 1-1/8 – 1-1/4 | 95 | 65 | 25 | 45 | |
| 1-3/8 – 1-1/2 | 90 | 50 | 30 | 45 |
Material | Specification | Standards | Size | Length |
ASTM A193 B8 CL4 Bolt
| 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 Bolts find their place in various applications that require high strength and corrosion resistance. They are commonly used in heat exchangers, pressure vessels, boilers, and flanged joints within chemical processing plants. Their ability to endure extreme conditions makes them ideal for industries such as marine, oil & gas, power generation, and petrochemicals. Additionally, these bolts are utilized in constructing bridges, industrial machinery, and structural components that face high pressure or temperature. Their outstanding mechanical performance and resistance to environmental damage guarantee long-lasting reliability in both critical and non-critical applications.
At Punit Fasteners, ASTM A193 B8 CL4 bolts are meticulously packaged to ensure safe and secure delivery. Each bolt is individually inspected and then packed in high-quality, protective materials to prevent damage during transit. Our packaging includes clear labeling with detailed specifications and batch information, facilitating easy identification and traceability. We offer flexible packaging options to meet customer requirements, ensuring that the bolts arrive in optimal condition for immediate use in your critical applications.
Punit Fasteners is a leading manufacturer and supplier of high-quality fasteners in Delhi, India, with over 15 years of experience serving global industries.
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