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Punit Fasteners stands out as a top-notch manufacturer and supplier of ASTM A193 B8 Class 5 Bolts, proudly based in Delhi, India. We specialize in delivering high-quality fasteners that are specifically designed for critical applications involving high temperatures and pressures. Our ASTM A193 B8 CL5 Bolts are crafted using cutting-edge machinery and premium raw materials, ensuring they meet rigorous international standards. These bolts are known for their exceptional corrosion resistance, impressive mechanical strength, and long-lasting durability, making them perfect for even the toughest industrial settings. With a dedicated team and efficient production processes, Punit Fasteners guarantees timely deliveries, precise engineering, and complete satisfaction for our clients both in India and around the world.
Our ASTM A193 B8 Class 5 Bolts are made from AISI 316 stainless steel, which undergoes carbide solution treatment and strain hardening. This results in enhanced mechanical properties, boasting a minimum tensile strength of 125 ksi (860 MPa) and a yield strength of 100 ksi (690 MPa). Class 5 bolts excel in resisting pitting, crevice corrosion, and chloride-induced stress corrosion cracking, particularly in marine and chemical processing settings. The inclusion of molybdenum in 316 stainless steel significantly boosts corrosion resistance compared to 304 stainless steel, making these bolts an excellent choice for aggressive environments.
| Element | B8 CL5 | B8 CL5 | B8M CL5 |
| 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 |
| B8 CL5 | 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 CL5 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M CL5 Class 1 | All | 75 | 30 | 30 | 50 |
| B8 CL5 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 CL5 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 B8 CL5 Bolt
| 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.
You’ll find ASTM A193 B8 CL5 Bolts widely utilized across various industries, including chemical processing, marine, petrochemical, oil and gas, power generation, and pharmaceuticals. They are particularly well-suited for high-stress applications involving flanges, valves, pressure vessels, heat exchangers, and other critical assemblies. Their outstanding corrosion resistance is especially beneficial in environments exposed to seawater, acids, and harsh chemicals. Additionally, these bolts are essential in offshore platforms, water treatment facilities, and food processing equipment, where hygiene and corrosion resistance are crucial for ensuring a long service life.
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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