Njabulo Stainless is a reliable manufacturer and supplier of Stainless Steel 347 Nuts, proudly based in Cape Town, South Africa. The company focuses on crafting top-notch austenitic stainless steel fasteners that offer outstanding corrosion resistance, strength, and durability, especially in high-temperature and industrial settings. Their Stainless Steel 347 Nuts are specially stabilized with niobium to ward off intergranular corrosion, making them perfect for use in the chemical, petrochemical, power generation, and marine sectors. With state-of-the-art manufacturing facilities and rigorous quality control measures, Njabulo Stainless ensures that their precision-engineered nuts meet international standards, providing secure and long-lasting fastening solutions for machinery, equipment, and structural assemblies.
These Stainless Steel 347 Nuts are primarily made up of iron, chromium (17–19%), nickel (9–13%), niobium (as a stabilizer), along with trace amounts of manganese, silicon, and carbon (capped at 0.08%). The niobium stabilization helps prevent carbide precipitation during welding, which enhances resistance to intergranular corrosion while keeping high tensile strength and toughness intact. These nuts boast a tensile strength of about 600–800 MPa, a yield strength of around 300–500 MPa, and good elongation properties, making them ideal for high-stress fastening applications in elevated temperatures and corrosive environments.
Grade | Mn | N | P | C | S | Cr | Mo | Si | Ni | Other | |
347 | min. max | 2.00 | – | 0.045 | – 0.08 | 0.030 | 17.0 19.0 | – | 0.75 | 9.0 13.0 | Nb=10(C+N) 1.0 |
Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
Rockwell B (HR B) max | Brinell (HB) max | ||||
347 | 515 | 205 | 40 | 92 | 201 |
|
Material |
Specification |
Standards |
Size
|
Length |
|
Stainless Steel 347 Nut |
IS BS ASTM |
ASTM A193 B8C |
3 mm to 200 mm |
M02 to M33 |
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A corrosion-resistant product, Stainless Steel 347 nuts are available in sizes from M6 to M64. They offer exceptional heat and oxidation resistance, ideal for high-temperature applications in aerospace and chemical processing industries.
A corrosion-resistant product, Stainless Steel 347 coupling nuts come in sizes from M6 to M36. They are designed to connect two male threads securely, providing high strength and stability in high-temperature and harsh industrial environments.
A corrosion-resistant product, Stainless Steel 347 nylon insert nuts, or lock nuts, are available in sizes from M3 to M36. The nylon insert helps prevent loosening under vibration, offering reliable performance in high-temperature applications.
A corrosion-resistant product, Stainless Steel 347 flange hex nuts feature an integrated flange and are available in sizes from M5 to M20. They provide enhanced load distribution and stability in high-temperature and corrosive environments.
A corrosion-resistant product, Stainless Steel 347 heavy hex nuts are available in sizes from M10 to M48. Their increased thickness and strength make them suitable for heavy-duty and high-temperature applications requiring robust and secure fastening.
A corrosion-resistant product, Stainless Steel 347 square nuts offer a larger contact surface and come in sizes from M6 to M30. They are ideal for high-temperature and heavy clamping applications, providing stability and durability.
We provide our customer with a high-quality stainless Steel 347 Nut with full transparency. All the products carry necessary documentations, which are commercial invoice packing list fumigation certificate; heat treatment chart of a test report from NABL-approved laboratory’s We also give EN10204 /3.1-b material test, PMI, and a report on radiography of 100%, along with our Third Party inspection report, to enable full documentation by which client can achieve complete satisfaction.
Stainless Steel 347 Nuts are extensively utilized in industries that demand high-temperature corrosion resistance and mechanical stability. They are particularly suited for boiler components, heat exchangers, superheaters, reheaters, pressure vessels, and piping systems found in chemical and petrochemical plants. Moreover, they find applications in marine equipment, power generation systems, and industrial machinery that face oxidizing and corrosive conditions. The combination of strength, corrosion resistance, and durability makes 347 nuts a go-to choice for critical high-performance and high-temperature industrial applications.
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