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The Fasteners Mart, reputable Mumbai, India-based manufacturer and supplier, is engaged in supplying quality fasteners of superior quality for various industrial uses. We offer ASTM A193 B8 CL4 bolts with high-grade stainless steel material, which are renowned for their toughness, resistance to corrosion, and longevity under aggressive conditions. The bolts are made to operate at high temperature and pressure and therefore are best suited for petrochemical, power generation, and chemical processing industries. Precision, strength, and customer satisfaction are what we stand for at The Fasteners Mart, making our fasteners meet the highest industry standards of performance in tough conditions.
ASTM A193 B8 CL4 bolts are produced from austenitic stainless steel with 18-20% chromium and 8-12% nickel along with controlled levels of carbon, manganese, phosphorus, sulfur, and silicon. They are strain-hardened for enhanced mechanical strength and stability. They provide a minimum tensile strength of 130 ksi (900 MPa) and minimum yield strength of 105 ksi (725 MPa). With the world-acclaimed resistance to oxidation, corrosion, and heat stress, ASTM A193 B8 CL4 bolts are ideal for high-temperature and high-pressure applications and are capable of withstanding stable performance under severe industrial conditions.
| Element | B8 CL4 | B8 CL4 | B8M CL4 |
| 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 CL4 | 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 CL4 Class 1 | All | 75 | 30 | 30 | 50 |
| B8M CL34Class 1 | All | 75 | 30 | 30 | 50 |
| B8 CL4 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 CL4 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 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 CL4 bolts have widespread usage in industries requiring high-strength corrosion-resistant fasteners for harsh environments. The bolts are highly suitable for application in the petrochemical, oil and gas, power generation, and chemical process industries. Some applications are fastening components in pressure vessels, heat exchangers, reactors, flanges, valves, and pumps operating under high temperature and pressure. Their excellent resistance to oxidation, creep, and stress corrosion suits them for extreme environments. ASTM A193 B8 CL4 bolts ensure the integrity and reliability of systems exposed to extreme conditions, delivering long-term performance in hostile industrial environments.
ASTM A193 B8 CL4 bolts are well packed in wooden crates or sealed boxes for easy delivery and to prevent any damage during transportation. All lots are put through rigorous testing, including dimensional examination, tensile strength, and hardness test, as well as corrosion resistance testing. Ultrasonic or dye penetrant tests can be carried out as non-destructive tests. These rigorous quality control procedures ensure that every bolt is to the required specifications, with consistent performance in high-temperature and high-pressure industrial applications.
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