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Punit Fasteners, a reliable manufacturer and supplier located in Delhi, India, specializes in high-quality ASTM A193 B8T Bolts that are perfect for high-temperature and corrosive settings. Crafted from Type 321 stainless steel, these bolts are titanium-stabilized to prevent intergranular corrosion, especially after welding and prolonged heat exposure. Engineered to meet ASTM A193 standards, our B8T bolts offer outstanding strength, durability, and precise dimensions, making them a top choice for critical applications in the oil & gas, petrochemical, marine, and power industries. At Punit Fasteners, we pride ourselves on delivering consistent quality, competitive prices, and timely delivery to satisfy the diverse needs of industrial clients around the globe.
ASTM A193 B8T Bolts are constructed from Type 321 stainless steel, an austenitic alloy that includes 17–20% chromium, 9–13% nickel, and titanium—added in quantities at least five times the carbon content to prevent carbide precipitation. This unique composition ensures excellent resistance to intergranular corrosion and outstanding oxidation resistance at high temperatures. B8T bolts boast a minimum tensile strength of 515 MPa and a yield strength of 205 MPa, along with good ductility and elongation. These characteristics guarantee reliable performance in high-stress bolted assemblies, especially in environments subjected to heat, pressure, and corrosive chemicals.
| 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 B8T Bolts
| 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 B8T bolts, made from AISI 316 stainless steel, are widely used in high-temperature and high-pressure environments. They are ideal for applications in the chemical and petrochemical industries, oil and gas, power generation, and marine environments. These bolts offer excellent corrosion resistance, strength, and durability, making them suitable for use in flanges, valves, pressure vessels, and heat exchangers. Their ability to withstand extreme conditions ensures reliability and longevity in critical industrial applications.
ASTM A193 B8T Bolts find extensive use in applications that demand corrosion resistance and thermal stability, particularly after welding. They are commonly utilized in industries such as oil & gas, chemical processing, marine, food processing, power generation, and pharmaceutical equipment. These bolts are perfect for flanged joints, pressure vessels, piping systems, heat exchangers, and boilers that operate under high temperatures or in corrosive media. Their titanium-stabilized composition helps prevent sensitization, ensuring they maintain long-term structural integrity.
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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