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Lina Fasteners is a leading supplier, manufacturer and exporter of stainless steel 309/309S washers known for exceptional corrosion resistance and durability. Our washers are available in various sizes and configurations for their excellent tensile strength and long service life. These books are designed to meet the exacting requirements of many industries, providing reliable performance in ambient and harsh environments.
Stainless Steel 309/309S Washers are made from austenitic alloys that boast higher levels of chromium and nickel, giving them outstanding resistance to oxidation and scaling even at elevated temperatures. The 309S grade features lower carbon content, which helps reduce carbide precipitation, improving both weldability and corrosion resistance. These washers are known for their impressive tensile strength, excellent toughness, and high ductility. They maintain their mechanical stability during thermal cycling, resist deformation under load, and deliver reliable performance in both continuous and intermittent high-temperature 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 Washers are ideal for fastening assemblies that face extreme heat and corrosive conditions. You’ll find them in a variety of applications, including furnaces, boilers, heat exchangers, exhaust systems, and high-temperature flanged joints. They are commonly used in petrochemical plants, oil refineries, power generation facilities, and thermal processing equipment. By evenly distributing loads and preventing surface damage, these washers significantly enhance joint integrity and extend service life. Their remarkable oxidation resistance makes them a go-to choice for demanding environments.
At Lina Fasteners, our commitment to quality is evident in the rigorous testing of all Stainless Steel 309/309S washers before shipment. We conduct advanced testing, including hardness, chemical analysis by Spectro analysis, good material identification (PMI), levelling, micro-macro, pitting resistance and intergranular corrosion (IGC) testing. In addition, we offer third-party inspection certificates to confirm that our washers meet the highest standards of quality and reliability, ensuring exceptional performance in harsh environments.
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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