Njabulo Stainless, based in Cape Town, South Africa, is a trusted manufacturer and supplier of high-quality Stainless Steel 440B Bolts. These bolts are engineered for high-strength fastening in demanding industrial, structural, and mechanical applications. Njabulo Stainless ensures precision threading, smooth surfaces, and consistent dimensions for secure and reliable connections. Stainless Steel 440B bolts are widely used in automotive, chemical, petrochemical, marine, and heavy machinery industries, where wear resistance, hardness, and corrosion resistance are essential. They provide long-lasting, safe, and efficient performance under harsh and high-stress operating conditions.
Stainless Steel 440B Bolts 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 bolts exhibit high fatigue strength, toughness, and dimensional stability, making them suitable for high-pressure, high-load, and vibration-prone applications. Precision threading ensures tight and secure fastening. These properties make 440B bolts ideal for critical assemblies where mechanical strength, durability, and reliable performance are essential in industrial and structural applications.
|
Material |
Specification |
Standards |
Size |
Length |
|
Stainless Steel 440b Bolts |
ASTM, ASME and API |
ASTM B 193 / ASME SB 193 |
M02 to M30 |
3 mm To 200 mm |
| Element | SS 440b |
| Tensile Strength (MPa) min | 480 |
| Yield Strength 0.2% Proof (MPa) min | 275 |
| Elongation (% in 50mm) min | 16 |
| Rockwell B (HR B) max Hardness | 95 |
| Brinell (HB) max Hardness | 201 |
| Element | SS 440b |
| Ni | 0.75 |
| C | 0.15 |
| Mn | 1.00 max |
| P | 0.04 max |
| S | 0.03 max |
| Si | 1.00 max |
| Cr | 11.5 – 13.5 |
| Mo | – |
| N | – |
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Stainless Steel 440B is a high-carbon martensitic stainless steel known for its excellent hardness, corrosion resistance and moderate corrosion resistance, making it suitable for demanding applications and precision tooling
Custom stainless steel 440B hex bolts are high-carbon martensitic stainless steel fasteners with hexagonal heads, tailored to high-strength wear-resistant applications, for durability and corrosion resistance
Stainless Steel 440B Leg Bolt is a high-carbon, martensitic steel fastener known for its excellent hardness and wear resistance. It’s ideal for heavy-duty applications, providing durability and strength.
Stainless Steel 440B Expansion Anchor Bolt is a high-carbon, martensitic steel fastener used for securing fixtures in concrete or masonry. Its hardness and strength ensure reliable performance under heavy loads.
Stainless Steel 440B Hex Flange Head Bolt features a hexagonal head with an integrated flange, offering high strength and wear resistance. It’s designed for heavy-duty applications requiring robust and stable fastening.
Stainless steel 440B full-threaded bolts are high carbon martensitic steel fasteners with full thread width and length. They offer exceptional rigidity and strength, suitable for demanding applications requiring full installation.
Quality control tests both destructive and non-destructive are conducted by our quality control team after manufacturing the Stainless Steel 440B Bolts. Advanced tools and techniques are used for testing in order to assure the client’s performance and longevity. When these bolts pass the tests, we package them correctly with relevant materials to conserve their quality during transport. We have ensured they reach the clients on time with no delays and make available all the necessary documentation at the time of delivery for full transparency.
Stainless Steel 440B Bolts are widely used in chemical plants, petrochemical facilities, automotive, aerospace, marine, and heavy machinery industries. They are ideal for fastening equipment, valves, pumps, pressure vessels, and structural components subjected to high stress, vibration, or temperature. Their wear and corrosion resistance make them suitable for industrial, construction, and outdoor environments, ensuring secure and long-lasting connections. 440B bolts are also used in machinery, cutting tools, and precision assemblies, providing reliable, durable, and efficient performance. Overall, they ensure safe and strong fastening in demanding applications requiring strength, toughness, and corrosion resistance.
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