309 square nuts offer four-sided grip for easy installation and excellent heat and corrosion resistance, suitable for structural and high-temperature industrial uses.
Rishabh Steel is a leading manufacturer and supplier of top-quality Stainless Steel 309 Nuts, based in Mumbai, India. We specialize in providing durable and precision-engineered fastening solutions that meet international standards such as ASTM, ASME, and DIN. Our SS 309 Nuts are designed for use in high-temperature and corrosive environments, offering superior performance and long service life. With a customer-focused approach, Rishabh Steel delivers reliable products, customized sizes, and timely delivery to clients across various industries in India and abroad
Stainless Steel 309 Nuts are made up of chromium (22–24%) and nickel (12–15%), which gives them fantastic resistance to oxidation, corrosion, and heat. These nuts are celebrated for their impressive mechanical strength, boasting a tensile strength of about 620 MPa and a yield strength of roughly 310 MPa. Thanks to the high levels of chromium and nickel, SS 309 maintains its structural integrity even in high-temperature settings. Additionally, this material provides good hardness, ductility, and creep resistance, making it a top choice for fastening applications in tough 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 |
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309 stainless steel nuts offer excellent corrosion and heat resistance, ideal for high-temperature fastening in chemical, power generation, and industrial environments.
309 coupling nuts are used to join threaded rods or studs, offering durability and resistance to oxidation in high-temperature and corrosive environments.
309 nylon insert nuts prevent loosening from vibration, combining stainless strength with secure locking, perfect for machinery and high-heat industrial applications.
309 flange hex nuts feature an integrated washer for better load distribution and grip, offering heat and corrosion resistance for heavy-duty industrial fastening.
309 heavy hex nuts have a larger and thicker profile for high-stress environments, providing strength and stability in high-temperature, corrosive industrial applications.
309 square nuts offer four-sided grip for easy installation and excellent heat and corrosion resistance, suitable for structural and high-temperature industrial uses.
Stainless Steel 309 Nuts are widely used in industries where exposure to high temperatures and corrosive elements is common. These include the petrochemical, power generation, furnace manufacturing, and thermal processing sectors. They are used in conjunction with bolts and studs in applications such as heat exchangers, boilers, flue gas systems, incinerators, and refinery equipment. SS 309 Nuts are also suitable for structural assemblies in high-temperature settings. Their corrosion resistance, thermal stability, and mechanical strength make them a dependable choice for secure fastening in challenging environments.
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