Harsh Metalloys is a reputable manufacturer and supplier of Stainless Steel 347 Nuts based in Mumbai, India. We specialize in providing high-quality fastening solutions made from stabilized austenitic stainless steel designed for high-temperature and corrosion-prone environments. SS 347 Nuts are formulated with columbium (niobium) to prevent intergranular corrosion, especially after welding or prolonged heating. Our range includes hex nuts, lock nuts, flange nuts, and custom fasteners conforming to international standards such as ASTM A194 and DIN specifications. These nuts offer excellent strength, durability, and oxidation resistance, making them suitable for demanding industrial applications in aerospace, power plants, and chemical processing.
Stainless Steel 347 Nuts are composed of 17–20% chromium, 9–13% nickel, and stabilized with columbium (niobium). They have a tensile strength of around 515 MPa and a yield strength of approximately 205 MPa, with excellent elongation and toughness. These properties enable superior performance at elevated temperatures and in corrosive environments. The alloy resists intergranular corrosion and maintains mechanical stability even after welding. SS 347 fasteners are known for their oxidation resistance up to 870°C, making them ideal for thermal cycling and long-term usage in aggressive industrial settings.
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 widely used in applications that demand high mechanical strength, thermal stability, and resistance to oxidation and corrosion. Common industries include oil and gas, petrochemicals, heat exchangers, aerospace, shipbuilding, and power generation. These nuts are particularly beneficial in equipment exposed to high temperatures, such as pressure vessels, furnaces, and turbine components. Their stabilized composition ensures dimensional integrity in welded assemblies, making them highly reliable for long-term service. Harsh Metalloys supplies SS 347 Nuts in various sizes and thread types, customized to meet both standard and application-specific requirements for secure and corrosion-resistant fastening.
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