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Amin Fasteners stands out as a dependable manufacturer and supplier based in Safat, Kuwait, specializing in high-performance ASTM A193 B8 CL4 Bolts designed for tough industrial applications. These bolts are crafted using cutting-edge manufacturing techniques, ensuring they boast exceptional strength, corrosion resistance, and long-lasting durability. Amin Fasteners serves vital sectors like petrochemical, oil and gas, power generation, marine, and construction, delivering products that adhere to strict international standards. Their dedication to precision, quality assurance, and timely delivery has established them as a trusted name for robust fastening solutions in critical and high-stress environments.
ASTM A193 B8 CL4 Bolts are constructed from austenitic stainless steel Grade 304, which includes chromium and nickel in carefully controlled amounts, providing excellent corrosion resistance and toughness. The Class 4 designation signifies that these bolts are solution-annealed and strain-hardened, resulting in enhanced mechanical strength. They showcase high tensile strength, remarkable ductility, strong resistance to stress corrosion cracking, and reliable performance even at elevated temperatures. With precise threading and solid structural integrity, these bolts are perfect for challenging environments that demand durable, corrosion-resistant, and high-strength fastening components.
| 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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ASTM A193 B8 CL4 bolts are used in demanding environments such as petrochemical plants, power generation, and high-pressure vessels. They are ideal for applications requiring high strength and resistance to high temperatures and corrosive conditions. Commonly found in flanged joints, pressure vessels, and heavy machinery, these bolts provide reliability and durability in critical industrial settings. Their robust properties make them suitable for both maintenance and new installations in challenging operational environments.
In various industries that require dependable and corrosion-resistant fasteners, ASTM A193 B8 CL4 Bolts are a go-to choice for withstanding harsh operating conditions. They’re frequently used in chemical processing units, oil and gas refineries, desalination plants, marine equipment, and power generation systems. Additionally, these bolts find applications in pressure vessels, pipelines, heat exchangers, boilers, pumps, and structural assemblies that operate in corrosive or high-temperature settings. Their outstanding mechanical properties and resistance to environmental degradation make them ideal for critical applications.
Amin Fasteners is a leading manufacturer and supplier of high-quality fasteners in Safat, Kuwait, with over 8 years of experience serving global industries.
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