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MUKAU FASTENERS is a reliable manufacturer and supplier based in Kinshasa, Congo, specializing in high-quality Stainless Steel 309/309S Bolts. These bolts are crafted for outstanding high-temperature performance, mechanical strength, and resistance to corrosion. Made from a high-chromium, nickel-rich austenitic stainless steel, they offer exceptional durability and secure fastening even in tough industrial settings. MUKAU FASTENERS is committed to precision manufacturing and follows international standards, making their 309/309S Bolts perfect for use in furnaces, boilers, heat exchangers, chemical processing equipment, and industrial machinery, where maintaining structural integrity and reliable load-bearing capacity in high-temperature and oxidizing environments is essential.
Stainless Steel 309/309S Bolts are composed of about 23–25% chromium, 12–14% nickel, and a low carbon content in 309S to minimize carbide precipitation. They boast a tensile strength ranging from 515–620 MPa, along with high yield strength, excellent ductility, toughness, and oxidation resistance at elevated temperatures. This alloy is designed to resist scaling, maintain dimensional stability, and prevent stress corrosion cracking, ensuring dependable mechanical performance. These bolts are built to endure thermal cycling, mechanical stress, and moderate corrosive environments, making them ideal for critical high-temperature industrial applications.
Element | Content (%) |
Iron, Fe | 60 |
Chromium, Cr | 23 |
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 Bolts find extensive use in industrial furnaces, boilers, heat exchangers, chemical and petrochemical plants, and high-temperature machinery due to their remarkable heat and corrosion resistance. They are perfect for fastening structural components, securing nuts and washers, and ensuring reliable connections in pressure vessels, piping systems, and heat-intensive equipment. The 309/309S grade guarantees long-lasting durability, minimal maintenance, and consistent mechanical performance in oxidizing and moderately corrosive environments.
Mukau Fasteners offers a full range of documentation, including our stainless steel 309/309S bolts, trademarks, packaging information, and quality certificates. We offer comprehensive test reports such as MTC per EN 10204/3.1b, PMI Testing, 100% radiography, and third-party inspections. These documents ensure transparency and the quality and compliance of our bolts, resulting in complete 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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