Aditya Stainless, a prominent manufacturer and supplier located in Kolkata, India, specializes in high-performance Stainless Steel 440B Nuts designed for critical fastening tasks that demand exceptional hardness and wear resistance. Crafted from high-carbon martensitic stainless steel, these nuts offer remarkable strength and durability, even in the toughest conditions. With precise threading, outstanding dimensional accuracy, and strong resistance to corrosion and deformation, SS 440B nuts are perfect for high-stress mechanical assemblies. Aditya Stainless adheres to strict quality standards, making these nuts a reliable choice for aerospace, automotive, industrial machinery, and marine engineering, where dependability and longevity are essential.
Stainless Steel 440B Nuts consist of 16–18% chromium, 0.75% molybdenum, 0.9–1.2% carbon, along with trace amounts of manganese, silicon, and phosphorus. This martensitic grade achieves impressive hardness levels of up to 58 HRC after heat treatment. Their mechanical properties include a tensile strength of at least 750 MPa and a yield strength of at least 450 MPa, along with excellent fatigue and impact resistance. While they offer moderate corrosion resistance, especially in dry and mildly acidic conditions, the alloy’s capacity for high hardness makes SS 440B an excellent choice for fasteners that need to withstand wear, bear loads, and maintain stability under mechanical stress.
C | Si | Mn | P | S | N | Cr | Cu | Mo | Ni | Ti | V |
|---|---|---|---|---|---|---|---|---|---|---|---|
0.75 – 0.95 | – | – | – | – | – | 16.00 – 18.00 | – | 0.90 – 1.30 | – | – | 0.07 – 0.12 |
| Tempering Temperature (°C) | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (% in 50mm) | Hardness Rockwell (HR C) | Impact Charpy V (J) |
|---|---|---|---|---|---|
| Annealed* | 758 | 448 | 14 | 269HB max | – |
| 204 | 2030 | 1900 | 4 | 59 | 9 |
| 260 | 1960 | 1830 | 4 | 57 | 9 |
| 316 | 1860 | 1740 | 4 | 56 | 9 |
| 371 | 1790 | 1660 | 4 | 56 | 9 |
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.74 g/cm3 | 0.280 lb/in³ |
| Melting point | 1482°C | 2700°F |
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A corrosion-resistant product, Stainless Steel 440B nuts are available in sizes from M6 to M64. Known for their high strength and hardness, they are ideal for heavy-duty applications in industrial machinery and automotive components.
A corrosion-resistant product, Stainless Steel 440B coupling nuts, used to join two male threads, come in sizes from M6 to M36. They provide exceptional strength and durability, making them suitable for high-stress and heavy-duty applications.
A corrosion-resistant product, Stainless Steel 440B nylon insert nuts, or lock nuts, are available in sizes from M3 to M36. The nylon insert prevents loosening under vibration, offering secure fastening in high-strength and demanding environments.
A corrosion-resistant product, Stainless Steel 440B flange hex nuts feature an integrated flange and come in sizes from M5 to M20. They provide enhanced load distribution and stability, suitable for high-stress and high-temperature applications.
A corrosion-resistant product, Stainless Steel 440B heavy hex nuts are available in sizes from M10 to M48. Their increased thickness and strength make them ideal for heavy-duty applications and high-stress environments requiring robust and secure fastening.
A corrosion-resistant product, Stainless Steel 440B square nuts offer a larger contact surface and come in sizes from M6 to M30. They are ideal for high-strength applications requiring reliable performance in heavy clamping and industrial settings.
Aditya Stainless ensures high-quality materials with a string of tests for excellence. Stainless Steel 440B Nut goes through proper checks such as hardness testing, spectrochemical analysis, PMI testing, tensile testing, micro and macro structural tests, pitting resistance, and IGC testing. We assure high performance through these strict checks. Supporting our commitment to quality, we provide documentation, such as commercial invoices, packing lists, labels, Certificates of Origin, and Third-Party Inspection Certificates, for customer satisfaction on pricing, delivery, and reliability of the products.
Stainless Steel 440B Nuts are perfect for applications that require high tensile strength, hardness, and resistance to abrasion. They find their place in gear assemblies, engines, machine tools, high-performance motorsports, and precision mechanical systems. In the automotive industry, these nuts are utilized in suspension assemblies, brake systems, and transmission components. In marine engineering, they endure wear in moving parts that face moderate corrosion. Their ability to be heat-treated makes them suitable for a variety of demanding applications, ensuring they perform reliably under pressure and in challenging environments.
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