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Yasin Fasteners, located in Istanbul, Turkey, manufactures ASTM A193 B8 Class 3 fasteners designed for exceptional strength and performance. Made from strain-hardened 304 stainless steel that has been hardened more than CL2, these fasteners provide even higher mechanical strength. Yasin Fasteners follows strict ASTM guidelines to ensure consistent product quality and reliability. B8 CL3 fasteners are used in industries that require superior tensile strength and corrosion resistance, particularly in high-pressure and high-temperature systems. By combining expertise, advanced technology, and thorough testing, Yasin Fasteners delivers fastening solutions that fit the needs of critical global applications.
ASTM A193 B8 CL3 fasteners are made from strain-hardened 304 stainless steel, containing 18–20% chromium and 8–11% nickel. They provide a tensile strength of about 860 MPa, yield strength of 620 MPa, and elongation of 15–20%. Their improved mechanical properties make them stronger than CL1 and CL2 versions, while retaining their good corrosion resistance and toughness. B8 CL3 fasteners are suitable for demanding bolting applications where reliability, durability, and strength are essential. Their blend of corrosion resistance and enhanced strength ensures dependable fastening in harsh industrial environments.
| Element | B7 | B8 CL3 | B8 CL3M |
| 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 |
| B7 | 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 |
| B8 CL3M 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 | |
| B8 CL2M Class 3 | Up to 3/4 | 110 | 95 | 15 | 45 |
Material | Specification | Standards | Size | Length |
ASTM A193 B8 CL3 Fasteners | 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 CL3 fasteners are widely used in high-temperature and high-pressure environments, making them ideal for the petrochemical, aerospace, and power generation industries. They are commonly found in gas turbines, exhaust systems, and high-stress equipment where reliability and strength are crucial. Their excellent corrosion resistance also makes them suitable for harsh chemical environments and offshore applications. These fasteners ensure secure, long-lasting connections in critical and demanding applications.
ASTM A193 B8 CL3 fasteners from Yasin Fasteners are used in high-pressure vessels, boilers, and reactors within chemical, petrochemical, and power generation industries. They are found in piping systems, flanges, and heat exchangers that face corrosive and high-temperature environments. Construction and infrastructure projects apply them where maximum fastening strength is critical. Offshore and marine sectors also depend on their durability in saltwater conditions. With tensile and yield strength higher than other B8 classes, CL3 fasteners are perfect for industries that need top performance, reliability, and long service life in the harshest conditions.
Yasin Fasteners is a leading manufacturer and supplier of high-quality fasteners in Istanbul, Turkey, with over 8 years of experience serving global industries.
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