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Mazin Fasteners, located in Muscat, Oman, has earned a solid reputation as a reliable manufacturer and supplier of top-notch industrial fasteners, including ASTM A193 B8M bolts. These bolts are crafted to adhere to stringent international standards, guaranteeing precision, durability, and consistent performance. Tailored for tough industrial applications, ASTM A193 B8M bolts find their place in sectors like oil and gas, petrochemicals, power generation, and heavy engineering. At Mazin Fasteners, we blend cutting-edge manufacturing techniques with strict quality control to produce bolts that offer dependable, long-lasting, and safe fastening solutions for critical assemblies.
Made from austenitic stainless steel with added molybdenum for enhanced corrosion resistance, especially in environments rich in chlorides, ASTM A193 B8M bolts boast impressive tensile strength, toughness, and fatigue resistance while maintaining mechanical stability even at high temperatures. These bolts are perfect for high-pressure and high-temperature scenarios where durability and resistance to pitting and stress corrosion cracking are vital.
| Element | B7 | B8 | B8M |
| 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 |
| B7 | 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 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M Class 1 | All | 75 | 30 | 30 | 50 |
| B8 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 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 B8M 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 B8M bolts are used in a variety of complex applications where high strength and resistance to extreme conditions are critical. Commonly found in the petrochemical, aerospace and electrical industries, these bolts are ideal for hot environments and high pressure. They are employed in gas and oil pipelines, industrial equipment and medical devices. Their corrosion resistance and durability make them suitable for critical assemblies that require reliable and durable packaging.
You’ll often find ASTM A193 B8M bolts in flanged connections, pipelines, pressure vessels, valves, and heat exchangers. They’re well-suited for chemical plants, refineries, marine installations, and power stations where strength, corrosion resistance, and reliability are paramount. With their outstanding mechanical properties and extended service life, these bolts are the go-to choice for engineers and contractors looking for secure and trustworthy fastening solutions in demanding industrial settings.
Mazin Fasteners is a leading manufacturer and supplier of high-quality fasteners in Muscat, OMAN, with over 8 years of experience serving global industries.
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