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Punit Fasteners is a well-respected manufacturer and supplier of ASTM A193 B7 Bolts, proudly based in Delhi, India. We specialize in precision-engineered fasteners that adhere to global standards. Our ASTM A193 B7 Bolts are renowned for their durability, strength, and reliability, making them a go-to choice in high-pressure and high-temperature industrial settings. Crafted from high-grade alloy steel, these bolts undergo a rigorous heat treatment process to ensure they boast superior mechanical properties. At Punit Fasteners, we offer a variety of sizes and finishes, tailored to meet the unique needs of different industries. Our dedication to quality, prompt delivery, and customer satisfaction allows us to serve clients both across India and in international markets.
These ASTM A193 B7 Bolts are made from chromium-molybdenum alloy steel and are quenched and tempered to achieve impressive tensile and yield strength. They showcase excellent mechanical properties, with a minimum tensile strength of 125 ksi (860 MPa) and a yield strength of 105 ksi (720 MPa). Typically, they have a hardness rating between 24–35 HRC. Their remarkable resistance to heat and pressure makes them ideal for challenging conditions. When properly coated, B7 Bolts are also corrosion-resistant and work seamlessly with various grades of ASTM A194 nuts for secure assemblies.
Material | Specification | Standards | Size | Length |
ASTM A193 B7 Bolt | 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.
You’ll find ASTM A193 B7 Bolts widely utilized in the oil and gas, petrochemical, power generation, and construction industries. These bolts are specifically engineered for applications in pressure vessels, heat exchangers, flanges, valves, and pipeline systems that operate under high-temperature and high-pressure conditions. Their strength and reliability are crucial for critical joints in refineries, chemical plants, and thermal power stations. Additionally, they play a vital role in heavy machinery, boiler assemblies, and industrial equipment where maintaining mechanical integrity under stress is essential. Their performance in extreme conditions guarantees long-term safety and durability.
Punit Fasteners is a leading manufacturer and supplier of high-quality fasteners in Delhi, India, with over 15 years of experience serving global industries.
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