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Mazin Fasteners is a well-respected manufacturer and supplier of ASTM A193 B7 Nuts, proudly based in Muscat, Oman. We provide dependable bolting solutions to both regional and global industries. Our focus is on precision manufacturing, rigorous quality assurance, and adherence to international standards. With state-of-the-art production facilities and a team of experienced professionals, Mazin Fasteners produces nuts that are engineered for high-pressure and high-temperature applications. Our unwavering commitment to consistent quality, material traceability, and timely delivery has established us as a trusted supplier in the oil & gas, power generation, petrochemical, and heavy engineering sectors.
ASTM A193 B7 Nuts are crafted from chromium-molybdenum alloy steel and undergo heat treatment to achieve exceptional strength and toughness. The carefully controlled alloy composition ensures outstanding tensile strength, yield strength, and hardness, along with impressive resistance to wear and deformation. These nuts are designed to perform reliably under high pressure and moderately elevated temperatures. Their mechanical properties guarantee strong load-bearing capabilities, dimensional stability, and resistance to stress, making them ideal for demanding bolting applications that require durability and structural integrity.
Material | Specification | Standards | Size | Length |
ASTM A193 B7 Nuts | IS BS ASTM | DIN, ISO, JIS, GB, IS, BS, ASTM | M 02 to M 160 | 3 mm to 200 mm |
| 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 |
| 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% |
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 B7 Nuts find extensive use in high-pressure and high-strength bolting applications across a variety of industries. Common applications include flange connections in oil and gas pipelines, refineries, petrochemical plants, and power generation facilities. They are also frequently used in pressure vessels, heat exchangers, valves, pumps, and heavy machinery assemblies. These nuts are well-suited for service in moderately elevated temperatures and environments that experience vibration and mechanical stress. Their strength, reliability, and compliance with industry standards make ASTM A193 B7 Nuts a top choice for critical industrial applications.
Mazin Fasteners ensures the secure packaging of ASTM A193 B7 Nuts for optimal protection and easy handling. Each nut is individually packed to prevent damage during transit and storage, with clear labeling for quick identification. Our packaging is designed to maintain the integrity of the nuts and facilitate efficient inventory management. Trust Mazin Fasteners for meticulously packaged components, ensuring that your ASTM A193 B7 Nuts arrive in perfect condition, ready for reliable performance in your projects.
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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