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Yasin Fasteners, a well-respected manufacturer and supplier based in Istanbul, Turkey, specializes in providing top-notch fastening solutions like ASTM A193 B7 Nuts. These nuts are celebrated for their remarkable strength, durability, and precision engineering, crafted to adhere to stringent international standards. Built to withstand high-pressure and high-temperature conditions, ASTM A193 B7 Nuts find their place in various industries that require dependable performance in tough environments. Yasin Fasteners is committed to delivering outstanding quality, prompt service, and tailored solutions, making these nuts a fantastic option for use in petrochemical plants, refineries, oil and gas facilities, boilers, turbines, and power generation systems around the globe.
ASTM A193 B7 Nuts are made from a chromium-molybdenum alloy steel that includes carbon (0.37–0.49%), manganese (0.65–1.10%), chromium (0.75–1.20%), molybdenum (0.15–0.25%), along with trace amounts of silicon, phosphorus, and sulfur. The heat treatment process boosts their hardness, toughness, and overall strength. These nuts boast a minimum tensile strength of 125 ksi and a yield strength of 105 ksi, along with impressive creep resistance and fatigue strength. Their mechanical stability under high stress and elevated temperatures makes them ideal for critical bolting connections in demanding operating conditions.
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% |
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The ASTM A193 B7 Nuts are primarily made from medium carbon alloy steel and are heat-treated to achieve remarkable hardness and tensile strength. They usually have a quench-and-tempered structure, which provides impressive mechanical properties, including a minimum tensile strength of 125 ksi and exceptional resistance to wear and deformation, even under high-stress conditions. These nuts are designed to endure extreme temperatures and pressures, maintaining their structural integrity in demanding environments. Plus, they boast good fatigue resistance and durability, making them perfect for high-stress bolting applications where safety and reliability are paramount.
ASTM A193 B7 Nuts are widely utilized in heavy-duty industrial settings that face high pressure, high temperature, and corrosive environments. They are commonly found in petrochemical plants, oil and gas refineries, and power generation facilities, where they secure flanges, valves, and pressure vessels. In boilers, turbines, and heat exchangers, these nuts ensure reliable fastening even under thermal and mechanical stress. Their robust strength and durability also make them perfect for pipeline systems, structural joints, and chemical processing equipment. With a proven track record in harsh conditions, ASTM A193 B7 Nuts guarantee safety, efficiency, and longevity.
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