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At Rinku Fasteners, we take pride in offering durable and high-precision fastening solutions tailored for diverse industrial needs. As a leading manufacturer and supplier in Kolkata, India, we produce premium ASTM A193 B8 Bolts, engineered for exceptional corrosion resistance, strength, and performance. Manufactured from high-quality stainless steel, these bolts are ideal for use in high-pressure and high-temperature environments. With our commitment to precision engineering, strict quality standards, and customer-focused service, we ensure each bolt delivers reliable and long-lasting performance. Industries across India trust us for fastening solutions that enhance system safety, efficiency, and durability.
ASTM A193 B8 Bolts are made from austenitic stainless steel, typically Grade 304, enriched with chromium and nickel for strong corrosion and oxidation resistance. They undergo carbide-solution treatment to restore corrosion-resistant properties while ensuring stable mechanical strength. These bolts provide dependable tensile and yield strength, excellent ductility, and consistent hardness suitable for elevated temperatures. Their resistance to stress corrosion cracking, chemical exposure, and thermal fluctuation ensures long-term performance. The combination of corrosion resistance and structural stability makes them ideal for demanding environments requiring durable and reliable fastening solutions.
|
Material |
Specification |
Standards |
Size
|
Length |
|
ASTM A193 B8 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.
ASTM A193 B8 Bolts are widely used in industries where strength, corrosion resistance, and temperature stability are essential. They are commonly installed in boilers, heat exchangers, piping systems, and pressure vessels across power plants and refineries. Chemical and petrochemical industries depend on them for corrosive processing environments. Their hygienic and non-reactive nature makes them suitable for food processing, pharmaceutical production, and water treatment facilities. Marine environments and offshore structures rely on them for their resistance to saltwater corrosion. These bolts are also used in structural assemblies, pump systems, and mechanical equipment requiring long-lasting performance and safety.
At Rinku Fasteners, ASTM A193 B8 bolts are carefully packaged to ensure they reach you in pristine condition. Each bolt is individually inspected and wrapped to prevent damage during transit. Our packaging includes protective coatings and sturdy containers to safeguard against corrosion and mechanical stress. Additionally, we provide detailed labeling for easy identification and inventory management. Our commitment to careful packaging ensures that your high-quality fasteners arrive ready for use, maintaining their integrity and performance.
Rinku Fasteners is a leading manufacturer and supplier of high-quality fasteners in Kolkata, India, with over 8 years of experience serving global industries.
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