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The Fasteners Mart is a well-known Mumbai-based producer and seller of high-quality ASTM A193 B8 Class 5 fasteners. Designed for superior performance in severe environments, these fasteners offer high strength, durability, and corrosion resistance. They are extensively used in power plants, petrochemical plants, and marine engineering and are best suited for high-pressure and high-temperature applications. Fasteners Mart focuses on delivering products according to international standards, backed by accurate manufacturing and strict quality checks, making it the first preference for customers in India and foreign markets.
ASTM A193 B8 Class 5 fasteners consist of strain-hardened AISI 316 stainless steel with high strength and corrosion resistance. The chemical composition is 16–18% chromium, 10–14% nickel, and 2–3% molybdenum, with small amounts of carbon, manganese, and silicon. These have very good pitting and stress corrosion cracking resistance. Mechanically, B8 CL5 fasteners offer 125 ksi minimum tensile strength and 100 ksi yield strength with acceptable elongation and hardness levels, which makes them ideal to utilize in high-pressure, high-temperature, and corrosive industrial processes.
| 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% |
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Standards |
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ASTM A193 B8 CL5 Fasteners
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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 B8 Class 5 fasteners are widely applied in industries of high strength, corrosion resistance, and endurance. They are perfectly applicable in oil and gas, petrochemical, power generation, marine, and chemical process industries. Typical examples include fastening components in heat exchangers, pressure vessels, boilers, valves, pumps, and flanged joints which function under high pressure and high temperature conditions. Their acid and superior chlorides resistance makes them suitable for applications in offshore and coastal facilities. The fasteners maintain stable performance and structural strength, meeting stringent safety and engineering specifications under challenging corrosive environments.
ASTM A193 B8 Class 5 fasteners of The Fasteners Mart undergo stringent testing like mechanical, chemical, and dimension testing in order to conform to international standards of quality. Tensile strength, hardness, and corrosion resistance are tested for every batch. Fasteners are securely packed in wood crates, corrugated boxes, or according to customer specifications for safe delivery. Protective coverings and proper labeling maintain the products damage-free, dry, or contaminated-free during transportation and storage and facilitate safe delivery to the destination.
The Fasteners Mart is a leading manufacturer and supplier of high-quality fasteners in Mumbai, India, with over 8 years of experience serving global industries.
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