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Lina Fasteners is a reputable manufacturer and supplier based in Tunis, Tunisia, specializing in high-quality Stainless Steel 309/309S Nuts that are perfect for high-temperature and corrosive environments. Crafted with cutting-edge technology and rigorous quality control, these nuts offer outstanding oxidation resistance, strength, and precise dimensions. Lina Fasteners provides expertly engineered nuts that comply with international standards, ensuring dependable joint performance even in the toughest conditions. Commonly found in industries like petrochemical, power generation, furnace manufacturing, and oil & gas, Lina Fasteners is dedicated to delivering consistent quality, durability, and timely service for critical industrial needs.
Stainless Steel 309/309S Nuts are austenitic alloys rich in chromium and nickel, which grant them exceptional resistance to oxidation, scaling, and high-temperature corrosion. The low-carbon 309S variant reduces carbide precipitation, enhancing both weldability and corrosion resistance. These nuts boast impressive tensile strength, remarkable toughness, and high ductility. They maintain their mechanical integrity under thermal stress, resist deformation when loaded, and perform reliably in both continuous and intermittent high-temperature conditions.
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 Nuts are commonly utilized in fastening systems that face extreme heat and harsh environments. Typical applications include furnaces, boilers, heat exchangers, exhaust systems, and high-temperature flanged connections. They are widely used in petrochemical facilities, oil refineries, power generation plants, and thermal processing sectors. Thanks to their excellent oxidation resistance, these nuts are ideal for kilns, burners, and heat treatment equipment. They provide secure fastening, a long service life, and dependable performance in demanding applications.
At Lina 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.
Lina Fasteners is a leading manufacturer and supplier of high-quality fasteners in Tunis, Tunisia, with over 8 years of experience serving global industries.
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