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Mira Fasteners is your go-to manufacturer and supplier of ASTM A193 B8 Class 4 Bolts, proudly based in Kuala Lumpur, Malaysia. These bolts are designed for high-strength and corrosion-resistant applications, making them perfect for industries like oil & gas, petrochemical, marine, and power generation. Mira Fasteners is committed to upholding international standards, ensuring that every fastener they deliver meets the rigorous performance demands of critical bolted joints. With their efficient service and dependable product quality, it’s no wonder that Mira Fasteners is a top choice across Malaysia and Southeast Asia.
The ASTM A193 B8 Class 4 Bolts are crafted from strain-hardened AISI 304 stainless steel. Thanks to a carefully controlled cold-working process, these bolts boast enhanced mechanical properties, achieving a minimum tensile strength of 860 MPa and a yield strength of 690 MPa. They also maintain impressive corrosion resistance across various service environments, including chemical, marine, and mildly acidic conditions. Their robust strength and fatigue resistance make them ideal for high-pressure, high-temperature, and vibration-heavy applications where failure simply isn’t an option.
| 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.
You’ll often find ASTM A193 B8 Class 4 Bolts in pressure vessels, heat exchangers, flanged piping systems, and other structural assemblies that face aggressive environments. Their superior load-bearing capacity and corrosion resistance help cut down on maintenance needs while boosting long-term reliability. Typically paired with matching B8 Class 4 nuts and washers, these bolts create a secure, high-performance fastening system. Whether you’re working on new constructions or maintenance replacements, Mira Fasteners’ B8 Class 4 Bolts provide durable, long-lasting solutions for your critical applications.
At Mira 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.
Mira Fasteners is a leading manufacturer and supplier of high-quality fasteners in Kuala lumpur, Malaysia, with over 8 years of experience serving global industries.
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