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The Fasteners Mart, which is a Mumbai, India-based leading producer and supplier, is engaged in offering high-quality fastening products, including ASTM A193 B8 Class 5 bolts. These bolts, with their high strength and anti-corrosive properties, are ideally suited for use in high-pressure and high-temperature conditions and are utilized in the petrochemical, power generation, and marine industries. Committed to quality, precision engineering, and customer satisfaction, The Fasteners Mart ensures each product to be of international standard, making it a dependable and trustworthy partner for durable and strong fastener solutions across India and overseas markets.
ASTM A193 B8 Class 5 bolts are made of AISI 316 stainless steel, strain-hardened for added strength and durability. They have chromium (16-18%), nickel (10-14%), molybdenum (2-3%), and minute amounts of manganese, silicon, and carbon. These metals offer superior corrosion resistance, especially in chloride-rich environments. Mechanically, B8 CL5 bolts possess minimum tensile strength of 125 ksi and yield strength of 100 ksi along with desirable elongation and hardness. These features make them most appropriate for rigorous applications involving high temperature, pressure, and corrosive conditions.
| 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 |
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ASTM A193 B8 Class 5 bolts are commonly applied in processes requiring high strength, reliability, and corrosion resistance. Found in the petrochemical, oil and gas, power generation, and marine sectors, these bolts are suitable for flanged joints, pressure vessels, heat exchangers, and valve installations. Highly performative in high-temperature and high-pressure environments, these bolts can be employed in refineries, offshore platforms, and chemical processing plants. Besides, their resistance to corrosion in harsh conditions, especially to chloride exposure, makes them a reliable choice for coastal and marine structures to promote safety, longevity, and adherence to strict engineering standards.
In The Fasteners Mart, ASTM A193 B8 Class 5 bolts undergo rigorous testing for quality such as dimensional testing, mechanical testing, and chemical composition analysis to be in compliance with international standards. Each is tested for tensile strength, hardness, and corrosion resistance. Packaging is done with utmost care in the form of heavy-duty material like wooden crates, corrugated boxes, or special requested custom packaging to allow safe transportation and damage, moisture, or contamination resistance during shipping and storage to foreign locations.
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