Majid Fasteners is a leading manufacturer and supplier of high-quality ASTM A193 B7 nuts in Dubai, UAE, serving diverse industrial and commercial sectors with precision-engineered products. With a strong focus on durability, performance, and international quality standards, the company provides reliable fastening solutions designed to withstand high-pressure and high-temperature applications. Majid Fasteners combines advanced manufacturing technology with strict quality control to ensure every product meets customer expectations. Their extensive inventory, timely delivery, and commitment to customer satisfaction make them a trusted choice for clients across construction, oil and gas, petrochemical, and mechanical industries throughout the UAE and the Middle East.
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What is ASTM A193 B7 Nuts?
ASTM A193 B7 nuts are manufactured from chromium-molybdenum alloy steel, offering a strong combination of hardness and corrosion resistance. Their chemical composition typically includes carbon, manganese, phosphorus, sulfur, silicon, chromium, and molybdenum, ensuring excellent heat-tolerance and structural stability. Mechanically, these nuts provide high tensile strength, superior yield strength, and excellent hardness, making them suitable for high-pressure and high-temperature environments. Designed for demanding applications, ASTM A193 B7 nuts deliver reliable fastening performance across oil and gas, petrochemical, power generation, and heavy industrial sectors.
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ASTM A193 B7 Nuts Specifications
| 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% |
ASTM A193 B7 Nuts Chemical Composition
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 |
ASTM A193 B7 Nuts Mechanical Properties
| 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 |
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ASTM A193 B7 Nuts Uses
ASTM A193 B7 nuts are widely used in industries requiring high-strength and heat-resistant fasteners. They are ideal for bolting in high-pressure and high-temperature environments, making them essential in oil and gas, petrochemical, and power generation sectors. These nuts are commonly paired with ASTM A193 B7 bolts for securing flanges, valves, pressure vessels, and pipelines. They are also used in heavy machinery, structural engineering, and chemical processing equipment where safety and reliability are critical. Their durability, resistance to corrosion, and ability to maintain mechanical integrity under extreme conditions make them a trusted choice for demanding industrial applications.
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