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Trusted Mumbai, India-based manufacturer and supplier The Fasteners Mart offers premium-quality ASTM A193 B8 CL4 stud bolts made for demanding industrial use. Made of strain-hardened 304 stainless steel, these stud bolts provide outstanding strength, corrosion resistance, and performance under high-pressure and high-temperature settings. Our products are made to satisfy worldwide standards and are extensively used in marine, power, petrochemical, and oil & gas sectors. The Fasteners Mart is dedicated to offering consistent fastening solutions guaranteeing safety, durability, and efficiency for all projects.
Made from strain-hardened AISI 304 stainless steel, ASTM A193 B8 CL4 stud bolts improve their mechanical strength. With regulated quantities of Carbon, Manganese, Phosphorus, Sulfur, and Silicon, the chemical composition offers great corrosion resistance: Chromium (18–20%), Nickel (8–12%). Mechanically, these stud bolts show good hardness and elongation as well as a minimum tensile strength of 125 ksi (860 MPa) and a minimum yield strength of 105 ksi (725 MPa). Their strong qualities qualify them for critical industrial applications in high-pressure, high-temperature environments.
| Element | B8 CL3 | B8 CL3 | B8M CL3 |
| 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 CL3 | 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 CL3 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M CL3 Class 1 | All | 75 | 30 | 30 | 50 |
| B8 CL3 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 CL3 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 CL4 Stud 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.
ASTM A193 B8 CL4 stud bolts are extensively used in demanding industrial processes that require high strength and corrosion resistance. They are suitable for use in the oil and gas, petrochemical, power generation, and marine environments. Some of the common uses are pressure vessels, heat exchangers, flanged joints, valves, and piping systems that are exposed to high pressure and temperature. These stud bolts are best suited for harsh chemical conditions or extreme heat, and therefore play a vital role in onshore and offshore operations. Their consistency, durability, and compliance to international standards ensure long-term operation in demanding service conditions in the majority of industries.
At The Fasteners Mart, ASTM A193 B8 CL4 stud bolts undergo strict quality testing and secure packaging to ensure top performance and safe delivery. Each batch is tested for mechanical strength, chemical composition, hardness, and dimensional accuracy, with certification provided. Packaging is done using sturdy materials like wooden crates, cartons, and sealed poly bags, clearly labeled for traceability. This ensures the stud bolts remain protected from damage, corrosion, and contamination during storage and transportation to domestic and international destinations.
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