Harsh Metalloys is a reputed manufacturer and supplier of 347H Nuts, based in Mumbai, India. We specialize in high-quality stainless steel fasteners made from SS 347H, a stabilized austenitic stainless steel known for its excellent high-temperature strength and corrosion resistance. With niobium added for stabilization, 347H nuts resist intergranular corrosion and maintain mechanical integrity in elevated temperature environments. Our products adhere to international standards, catering to industries such as petrochemical, power generation, oil & gas, and chemical processing. Harsh Metalloys ensures precision, durability, and timely delivery, making us a preferred supplier for critical fastening solutions.
347H Nuts are manufactured from stainless steel containing 17–19% chromium, 9–13% nickel, with added niobium (columbium) to prevent carbide precipitation. This stabilization improves resistance to intergranular corrosion, especially after welding and prolonged high-temperature exposure. These nuts offer tensile strength of 515–760 MPa and a minimum yield strength of 205 MPa. The material maintains excellent toughness, ductility, and mechanical stability at elevated temperatures. 347H is non-magnetic in the annealed condition and provides enhanced creep resistance, making these nuts reliable for long-term service in harsh industrial environments.
| Specifications | : | ASTM A 193 ASME SA 193 |
| Standard | : | DIN, ASTM, BS and all International Standards |
| Length | : | 3 mm to 200 mm |
| Size | : | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
| Type | : | Hex Head nuts, Square nuts, Lock nuts, Eye nuts, wing nuts, T nuts, Panel Nuts, Coupling Nuts, Dome nuts, Acorn Nuts. |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 347H | min. | 0.04 | – | – | – | – | 17.0 | 3.00 | 9.0 | – |
| max. | 0.10 | 2.0 | 1.00 | 0.045 | 0.030 | 19.0 | 4.00 | 13.0 | – | |
| 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 | ||||
| 347H | 515 | 205 | 40 | 92 | 201 |
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A corrosion-resistant product, Stainless Steel 347H nuts are available in sizes ranging from M6 to M64. They are designed for high-temperature applications, offering excellent creep resistance and stability in extreme conditions, suitable for aerospace and power generation industries.
A corrosion-resistant product, Stainless Steel 347H coupling nuts connect two male threads and come in sizes from M6 to M36. They provide high strength and thermal stability, making them ideal for high-temperature applications in industrial and aerospace settings.
A corrosion-resistant product, Stainless Steel 347H nylon insert nuts, or lock nuts, are available in sizes from M3 to M36. The nylon insert prevents loosening under vibration, providing reliable performance in high-temperature environments where stability and security are crucial.
A corrosion-resistant product, Stainless Steel 347H flange hex nuts feature a built-in washer-like flange and come in sizes from M5 to M20. They offer enhanced load distribution and stability in high-temperature applications, ensuring durability and reliability.
A corrosion-resistant product, Stainless Steel 347H heavy hex nuts are larger and thicker, available in sizes from M10 to M48. They provide increased strength and thermal stability, making them suitable for heavy-duty and high-temperature industrial applications.
A corrosion-resistant product, Stainless Steel 347H square nuts have a larger surface area for contact, available in sizes from M6 to M30. They are ideal for high-temperature applications that require secure fastening in confined spaces and robust performance.
Stainless Steel 347H Nuts are packed in heavy-duty materials such as wooden boxes and pallets to prevent the nuts from external damage. Our product is hand-packed, and hence the Nuts are free from scratches or dents. The finished product reaches the client in excellent condition, and customers are consistently satisfied and impressed by the performance and long-lasting features of the Stainless Steel 347H Nuts.
347H Nuts from Harsh Metalloys are widely used in high-temperature and corrosive environments, such as petrochemical plants, power generation stations, oil refineries, and chemical processing units. They are commonly applied in assemblies involving boilers, superheaters, heat exchangers, and nuclear reactors, where strong, corrosion-resistant fastening is essential. Their superior resistance to thermal stress and oxidation makes them ideal for welded constructions and cyclic temperature conditions. These nuts ensure secure, leak-proof connections in critical piping and structural systems, offering durability and reliability in the most demanding industrial applications.
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