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MUKAU FASTENERS is a top-notch manufacturer and supplier based in Kinshasa, Congo, specializing in high-quality Stainless Steel 309/309S Nuts. These nuts are designed to withstand high temperatures, resist corrosion, and offer outstanding durability. Crafted from a high-chromium, nickel-rich austenitic stainless steel, they deliver excellent mechanical stability and reliable fastening performance, even in tough industrial settings. MUKAU FASTENERS prides itself on precision manufacturing and adherence to international standards, making these 309/309S Nuts perfect for use in furnaces, boilers, heat exchangers, chemical processing, and industrial machinery, where secure fastening and long-lasting reliability are crucial. They excel under heat, oxidation, and corrosive conditions.
Stainless Steel 309/309S Nuts are made up of about 23–25% chromium, 12–14% nickel, and a low carbon content in 309S to reduce carbide precipitation. They boast a tensile strength of approximately 515–620 MPa, along with high yield strength, excellent ductility, toughness, and oxidation resistance at elevated temperatures. This alloy is resistant to scaling, maintains its shape, and prevents stress corrosion cracking, ensuring long-term mechanical reliability. These features make 309/309S Nuts perfect for securing assemblies in high-temperature industrial and chemical environments where durability and corrosion resistance are a must.
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.
You’ll find Stainless Steel 309/309S Nuts commonly used in furnaces, boilers, heat exchangers, and chemical and petrochemical plants, as well as in high-temperature industrial machinery, thanks to their exceptional heat and corrosion resistance. They’re ideal for fastening structural components and securing bolts in piping systems, pressure vessels, and heat-intensive equipment, providing dependable load-bearing connections. The 309/309S grade guarantees durability, a long service life, and minimal maintenance, even in oxidizing and corrosive environments.
At Mukau Fasteners, we prioritize quality by offering multiple certifications on our 309/309S Nuts. Our comprehensive documentation includes commercial invoices, packaging information and certificates of departure. We perform comprehensive testing, offering reports on hardness testing, chemical analysis, positive material identification (PMI), pitting resistance tests, and more. In addition, we issue MTC, PMI test certificates and third-party inspection certificates in accordance with EN 10204/3.1b. This rigorous certification ensures that our fruits meet the highest standards and provide exceptional performance and reliability for demanding applications.
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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