Stainless Steel 440B Nuts are tough, wear-resistant fasteners crafted for mechanical assemblies that demand exceptional hardness, corrosion resistance, and durability. Made from martensitic stainless steel grade 440B, these nuts excel in challenging environments where strength and abrasion resistance are essential. You’ll often find them in high-stress applications like valves, pumps, automotive systems, and heavy-duty machinery. Precision-engineered, Stainless Steel 440B nuts ensure reliable fastening in both static and dynamic load situations, particularly where hardness and edge retention are key.
The chemical makeup of Stainless Steel 440B generally consists of 16–18% chromium, 0.75% molybdenum, and carbon content between 0.75–0.95%, along with trace amounts of manganese, silicon, and iron as the base element. This blend allows the material to be heat-treated for impressive hardness levels—up to 58 HRC. Mechanically, 440B boasts excellent tensile strength, often surpassing 750 MPa, along with outstanding wear resistance and moderate corrosion resistance in mild environments. It’s slightly more corrosion-resistant than 440A and harder than many other stainless steel fastener grades after proper hardening.
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.
Harshita 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 find their place in applications where components face abrasion, heavy loads, or frequent mechanical stress. They’re commonly used in industries like automotive, aerospace, tool manufacturing, defense, and marine hardware. These nuts are perfect for securing parts in precision instruments, cutting tools, surgical equipment, and bearing assemblies where wear resistance is vital. While they may not be as corrosion-resistant as austenitic grades, they perform admirably in moderately corrosive settings, striking a solid balance between hardness and durability for high-performance fastening needs.
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