Harsh Metalloys, a prominent manufacturer and supplier located in Mumbai, India, specializes in high-quality Stainless Steel 409 Nuts. These nuts are perfect for fastening applications that need moderate corrosion resistance and outstanding oxidation resistance. SS 409 is a ferritic stainless steel that excels in high-temperature settings, making these nuts particularly well-suited for automotive exhaust systems and industrial furnace equipment. Crafted to meet international standards like ASTM A194, our 409 nuts come in a variety of sizes, thread pitches, and finishes to cater to different industry requirements. They provide a cost-effective solution, durability, and dependable mechanical strength for thermal and mildly corrosive environments.
Stainless Steel 409 Nuts are made up of 10.5–11.75% Chromium and have a low Carbon content (≤ 0.08%). They are often stabilized with Titanium to avoid carbide precipitation during welding. As a ferritic stainless steel, SS 409 boasts moderate tensile strength (around 380–450 MPa), good ductility, and resistance to oxidation at temperatures reaching up to 650°C. While these nuts cannot be hardened through heat treatment, they maintain excellent dimensional stability and weldability. Their mechanical and corrosion-resistant properties make them ideal for fastening in environments that experience thermal cycling, vibration, and exposure to moisture or gases.
| Material | Specification | Standards | Size | Length |
| Stainless Steel 409 Nut | ASTM, ASME and API | ASTM B 193 / ASME SB 193 | M02 to M30 | 3 mm To 200 mm |
| Element | Content |
|---|---|
| Carbon | 0.08 maximum |
| Manganese | 1.00 maximum |
| Phosphorus, maximum | 0.045 maximum |
| Sulfur, maximum | 0.045 maximum |
| Silicon | 1.00 maximum |
| Nickel | 0.5 |
| Chromium | 11.75 |
| Molybdenum | – |
| Tensile Strength/Ultimate Tensile Stress (UTS) – (Mpa) | 450 |
| Yield Strength/Proof Stress(0.2% Offset) (YS) – (Mpa) | 240 |
| Elongation in 4D (El) | 25% min |
| Reduction | – |
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409 nuts are known for their solid strength, heat resistance, and decent corrosion protection, making them a great choice for automotive applications, exhaust systems, and industrial settings where secure fastening is a must.
These 409 coupling nuts are designed to connect two threaded rods firmly, making them perfect for structural and mechanical assemblies in environments that experience high temperatures and mild corrosion, like automotive and HVAC systems.
Featuring a self-locking nylon collar, 409 nylon insert nuts are built for vibration resistance, making them ideal for dynamic or high-vibration settings such as engine mounts and industrial machinery.
With an integrated washer base to help distribute load, 409 flange hex nuts are commonly used in automotive exhaust systems and machinery that require a reliable grip and thermal resistance.
Offering an extra bearing surface and impressive torque strength, 409 heavy hex nuts are perfect for high-load and structural applications that are exposed to heat and mild corrosion.
These 409 square nuts deliver strong, stable fastening thanks to their large contact surfaces, making them suitable for channel frameworks, assemblies, and traditional fittings where resistance to rotation is crucial.
Stainless Steel 409 Nuts are commonly used in automotive applications, especially in exhaust systems, mufflers, and catalytic converter assemblies. They are also suitable for industrial furnace components, ducts, flanges, and structural assemblies exposed to high heat and mild corrosion. Due to their affordability and decent performance in oxidizing environments, SS 409 nuts are favored in HVAC systems, heat exchangers, and chemical processing equipment. Their formability and weldability make them ideal for OEMs and fabricators needing secure fastening solutions in thermal or corrosive applications without the higher cost of austenitic stainless steels.
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