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MUKAU FASTENERS, a reliable manufacturer and supplier located in Kinshasa, Congo, specializes in high-quality Stainless Steel 309/309S Stud Bolts designed for outstanding performance in high-temperature and corrosive settings. Crafted from austenitic stainless steel with a rich blend of chromium and nickel, these stud bolts offer remarkable resistance to oxidation and heat. The 309S grade, featuring lower carbon content, enhances weldability and helps prevent carbide precipitation. MUKAU FASTENERS guarantees that every 309/309S Stud Bolt adheres to international quality standards, making them perfect for demanding applications in furnaces, heat exchangers, power plants, and petrochemical industries that require strength, durability, and dependable fastening performance.
Stainless Steel 309/309S Stud Bolts are made up of roughly 23–25% chromium, 12–15% nickel, and a maximum carbon content of 0.08% (with the 309S variant having even lower carbon). This unique composition ensures exceptional resistance to oxidation, scaling, and corrosion in high-temperature and mildly corrosive environments. These stud bolts boast a tensile strength of about 515 MPa and a yield strength of around 205 MPa, while also maintaining toughness and ductility at elevated temperatures. Their impressive creep resistance and mechanical stability make them ideal for extended exposure to harsh industrial conditions.
Element | Content (%) |
Iron, Fe | 60 |
Chromium, Cr | 24 |
Nickel, Ni | 14 |
Manganese, Mn | 2 |
Silicon, Si | 1 |
Carbon, C | 0.20 |
Phosphorous, P | 0.045 |
Sulfur, S | 0.030 |
Properties | Metric | Imperial |
Tensile strength | 620 MPa | 89900 psi |
Yield strength (@ strain 0.200%) | 310 MPa | 45000 psi |
Izod impact | 120 – 165 J | 88.5 – 122 ft-lb |
Shear modulus (typical for steel) | 77 GPa | 11200 ksi |
Elastic modulus | 200 GPa | 29008 ksi |
Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
Elongation at break (in 50 mm) | 45% | 45% |
Hardness, Brinell | 147 | 147 |
Hardness, Rockwell B | 85 | 85 |
Hardness, Vickers (converted from Rockwell B hardness) | 169 | 169 |
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.
Stainless Steel 309/309S Stud Bolts find extensive use in furnaces, boilers, heat treatment units, power plants, and petrochemical facilities, thanks to their high-temperature strength and corrosion resistance. They are perfect for exhaust systems, burners, flue ducts, and thermal processing equipment where reliable fastening is essential under continuous heat and pressure. The 309S grade is especially well-suited for welded assemblies and applications that require improved formability. Additionally, these stud bolts are utilized in chemical processing, industrial ovens, and marine equipment, providing robust and dependable performance in challenging environments.
Mukau Fasteners provides comprehensive documentation with our Stainless Steel 309/309S Stud Bolts, including commercial documentation, packaging information and quality certificates. We also offer comprehensive test reports, such as MTC per EN 10204/3.1b, PMI Testing, 100% radiography, and third-party inspections. This comprehensive documentation ensures transparency, proves quality and guarantees compliance, resulting in high customer satisfaction.
Mukau Fasteners is a leading manufacturer and supplier of high-quality fasteners in Kinshasa, Congo, with over 8 years of experience serving global industries.
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