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Murad Fasteners has established itself as a reliable manufacturer and supplier in Doha, Qatar, specializing in high-quality ASTM A193 B8 CL4 Bolts. These bolts are specifically designed for tough industrial applications that demand superior strength and resistance to corrosion. With state-of-the-art manufacturing facilities and rigorous quality control measures, Murad Fasteners ensures that each bolt features precise threading, excellent dimensional accuracy, and consistent mechanical performance. Meeting international standards, these bolts are widely utilized across critical sectors. Whether it’s the oil and gas, petrochemical, power generation, or heavy engineering industries, Murad Fasteners is committed to providing tailored solutions, competitive pricing, and prompt delivery for dependable fastening needs.
The ASTM A193 B8 CL4 Bolts are crafted from austenitic stainless steel, akin to Type 304, and are both solution annealed and strain hardened to enhance their strength. This alloy, rich in chromium and nickel, offers remarkable resistance to corrosion and oxidation. In terms of mechanics, Class 4 bolts boast higher tensile and yield strength compared to standard B8 grades, while also providing good toughness and ductility. They remain stable under high temperatures, sustained loads, and intense pressure, ensuring reliable performance in challenging industrial settings.
| 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 |
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These ASTM A193 B8 CL4 Bolts are extensively used in scenarios that require exceptional strength and corrosion resistance. You’ll often find them in flanged joints, pressure vessels, boilers, heat exchangers, valves, and piping systems within the oil and gas, petrochemical, and power generation sectors. Their design makes them perfect for assemblies that face thermal stress, mechanical loads, and corrosive environments. With their durability, mechanical reliability, and long service life, these bolts are an excellent choice for critical industrial fastening applications.
At Murad 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.
Murad Fasteners is a leading manufacturer and supplier of high-quality fasteners in Doha, Qatar, with over 8 years of experience serving global industries.
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