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Puri Fasteners is a well-respected manufacturer and supplier located in Chennai, known for its top-notch **ASTM A193 B8 CL4 Bolts** that adhere to strict international standards. The company prides itself on precision engineering and thorough quality control, producing bolts that are specifically designed for tough industrial and pressure-vessel applications. Puri Fasteners serves various sectors, including power generation, oil & gas, chemical processing, and high-temperature piping systems. Their dedication to reliable supply, consistency, and technical compliance makes them a go-to partner for clients in need of durable and corrosion-resistant bolting solutions, even in the harshest conditions.
ASTM A193 B8 CL4 bolts are crafted from austenitic stainless steel, usually Type 304 / 304L, which contains around **18–20% chromium and 8–11% nickel**, with specific limits for carbon (≈0.08%), manganese, phosphorus, sulfur, and silicon as outlined in the specifications. The “Class 4” label signifies that these bolts are strain-hardened (cold worked) to boost their strength. This process results in a minimum tensile strength of up to **125 ksi (≈860 MPa)** and a significantly higher yield strength compared to annealed fasteners, making them robust and ideal for high-pressure applications.
| 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 are extensively utilized in industries that demand strong, corrosion-resistant fasteners capable of enduring high pressure and temperature. They are perfect for **pressure vessel bolting**, **piping systems** in power plants, petrochemical and chemical refineries, and **high-temperature steam lines**. Their impressive corrosion resistance and strength also make them suitable for **offshore, marine, and desalination platforms**, ensuring reliability in challenging environments.
At Puri 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.
Puri Fasteners is a leading manufacturer and supplier of high-quality fasteners in Chennai, India, with over 8 years of experience serving global industries.
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