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ASTM A193 B8T Nuts are high-performance stainless steel fasteners designed for demanding industrial applications that require both strength and corrosion resistance. Manufactured from austenitic stainless steel, typically Grade 304 or 316, these nuts are solution-treated and lightly cold-worked to enhance mechanical properties and durability. Ideal for high-pressure, high-temperature, and corrosive environments, they are widely used in petrochemical plants, refineries, power generation units, and marine industries. With precision manufacturing and strict quality control, ASTM A193 B8T Nuts ensure secure, long-lasting fastening. Industries trust them for reliability, safety, and consistent performance in critical applications.
ASTM A193 B8T Nuts are made from austenitic stainless steel with chromium and nickel content, providing excellent corrosion resistance and oxidation stability. The T designation indicates solution treatment and light cold working, giving these nuts high tensile and proof strength while maintaining ductility. They resist stress corrosion cracking and retain hardness under elevated temperatures and cyclic loading. Their balanced mechanical properties—strength, toughness, and corrosion resistance—make them ideal for securing bolts and stud bolts in high-pressure, high-temperature, and chemically aggressive industrial environments, ensuring dependable long-term performance.
| 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 Nuts
| 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 Nuts are widely used in industries that demand secure, corrosion-resistant, and high-strength fastening solutions. They are commonly applied in high-pressure piping systems, flanged joints, boilers, heat exchangers, pressure vessels, and valve assemblies in petrochemical, chemical processing, and power generation industries. Their mechanical strength and corrosion resistance make them suitable for marine and offshore installations, as well as pharmaceutical, food, and water treatment equipment. Paired with B8T bolts and stud bolts, these nuts provide durable, reliable, and long-term fastening in critical industrial applications exposed to high temperatures, pressure, and corrosive conditions.
We provide complete documentation on our ASTM A193 B8T nuts, including 100% radiography test reports, raw material test reports, customer test reports, and heat treatment plans. This includes our packaging, fumigation certificates, marketing invoices, quality assurance systems, and raw materials. In addition, we issue manufacturer test certificates (MTC) under EN 10204/3.1B. Our ASTM A193 B8T nuts are packaged according to industry standards and manufactured to meet customer specifications, ensuring quality and complying with all required documentation.
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