Njabulo Stainless, based in Cape Town, South Africa, is a trusted manufacturer and supplier of Stainless Steel 440B Fasteners. These high-strength fasteners include bolts, nuts, studs, and washers, designed for secure, durable, and reliable connections in demanding industrial and structural applications. Njabulo Stainless ensures precision threading, smooth surfaces, and uniform dimensions, providing leak-proof and stable fastening solutions. Stainless Steel 440B fasteners are widely used in automotive, chemical, petrochemical, marine, and heavy machinery industries, where wear resistance, hardness, and moderate corrosion resistance are essential. They deliver long-lasting, safe, and efficient performance under harsh and high-stress conditions.
Stainless Steel 440B Fasteners are made from martensitic stainless steel 440B, containing high carbon (0.75–0.95%) and chromium (16–18%). This composition provides excellent hardness, tensile strength, and wear resistance, while offering moderate corrosion resistance. Mechanically, 440B fasteners exhibit high fatigue strength, toughness, and dimensional stability, making them ideal for high-pressure, high-load, and vibration-prone applications. Precision manufacturing ensures smooth threads and accurate dimensions, allowing secure and reliable fastening. These properties make 440B fasteners suitable for critical assemblies requiring strength, durability, and reliable performance in industrial and structural environments.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.74 g/cm3 | 0.280 lb/in³ |
| Melting point | 1482°C | 2700°F |
|
C
|
Si
|
Mn
|
P
|
S
|
N
|
Cr
|
Cu
|
Mo
|
Ni
|
Ti
|
V
|
|---|---|---|---|---|---|---|---|---|---|---|---|
|
0,85 – 0,95
|
–
|
–
|
–
|
–
|
–
|
17,00 – 19,00
|
–
|
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 |
Contact us to get a quick quote for your requirement.
Highly resistant to corrosion, Stainless Steel 440B Nuts are designed for high-strength applications. Available in sizes ranging from M3 to M24, they are precision-manufactured to ensure reliable performance and durability.
Stainless Steel 440B Stud Bolts offer excellent corrosion resistance and are ideal for demanding environments. Typically available in lengths from 50mm to 500mm and diameters from M6 to M30, they provide robust fastening solutions for various industrial applications.
Stainless Steel 440B Bolts exhibit superior corrosion resistance and are suitable for harsh conditions. They come in sizes from M6 to M30 and lengths ranging from 10mm to 300mm. Their high strength and durability make them ideal for critical applications.
With excellent corrosion resistance, Stainless Steel 440B threaded rods are used in heavy-duty applications. They are available in lengths from 100mm to 2000mm and diameters ranging from M6 to M30, offering versatility and strength in fastening solutions.
Stainless Steel 440B screws provide high corrosion resistance and are used in various applications. Sizes range from M3 to M20, with 10mm to 150mm lengths. They are known for their strength and reliability in tough environments.
Stainless Steel 440B washers offer exceptional corrosion resistance, crucial for distributing loads and reducing friction. They are available in sizes from M3 to M30, with standard thicknesses that ensure durability and performance in high-stress applications.
Here at Njabulo Stainless, Cape Town, South Africa, our primary concern is a faultless customer experience by providing comprehensive documentation for our premium Stainless Steel 440B Fasteners. This includes all the necessary documents like commercial invoice, packaging list, heat treatment chart, quality assurance plan and the NABL-approved lab test report. Additional offerings include MTC, PMI Test Certificate, radiography test reports, and Third-Party Inspection Certificates, assuring you of quality and customer satisfaction.
Stainless Steel 440B Fasteners are widely used in automotive, aerospace, chemical, petrochemical, marine, and heavy machinery industries. They are ideal for fastening bolts, nuts, studs, and washers in high-stress, high-load, or vibration-prone environments. Their wear and corrosion resistance make them suitable for industrial, construction, and outdoor applications, ensuring secure, durable, and long-lasting connections. 440B fasteners are also used in valves, pumps, pressure vessels, and precision machinery, providing reliable and efficient performance. Overall, they ensure safe and strong fastening in demanding applications requiring toughness, wear resistance, and moderate corrosion resistance.
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