Harsh Metalloys is a reputed manufacturer and supplier of 348 Nuts, based in Mumbai, India. We offer high-quality stainless steel 348 fasteners engineered for superior strength, corrosion resistance, and high-temperature performance. SS 348 is a niobium-stabilized austenitic stainless steel, providing excellent resistance to intergranular corrosion and oxidation in elevated temperature environments. Our 348 nuts are manufactured to meet international standards and are used extensively in industries such as petrochemicals, refineries, heat exchangers, and power generation. Harsh Metalloys ensures precision, durability, and prompt delivery, making us a preferred supplier for critical fastening applications in demanding industrial environments.
348 Nuts are made from stainless steel containing 17–20% chromium and 8–13% nickel, with niobium (columbium) added for stabilization. This alloy prevents carbide precipitation, enhancing resistance to intergranular corrosion, especially after welding. The nuts exhibit a tensile strength of 515–760 MPa and a minimum yield strength of 205 MPa. SS 348 maintains its mechanical properties at elevated temperatures and offers good ductility and toughness. The niobium stabilization makes these nuts suitable for continuous service in high-heat environments without the risk of sensitization, ensuring long-lasting and reliable fastening performance under thermal stress.
| Element | Content (%) |
|---|---|
| Iron, Fe | 66 |
| Chromium, Cr | 18 |
| Nickel, Ni | 10 |
| Manganese, Mn | 2.0 |
| Silicon, Si | 1.0 |
| Nb + Ta | 0.8 |
| Cobalt, Co | 0.2 |
| Tantalum, Ta | 0.1 |
| Carbon, C | 0.080 |
| Phosphorous, P | 0.045 |
| Sulfur, S | 0.030 |
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 655 MPa | 95000 psi |
| Yield strength (@ strain 0.200%) | 275 MPa | 39900 psi |
| Izod impact | 120 – 160 J | 88.5 – 118 ft-lb |
| Charpy impact | 160 J | 118 ft-lb |
| Shear modulus (typical for steel) | 77.0 GPa | 11200 ksi |
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 45% | 45% |
| Hardness, Brinell (converted from Rockwell B hardness) | 147 | 147 |
| Hardness, Knoop (converted from Rockwell B hardness) | 164 | 164 |
| Hardness, Rockwell B | 85 | 85 |
| Hardness, Vickers (converted from Rockwell B hardness) | 169 | 169 |
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Stainless steel 348 nuts are ideal for high temperature applications. Available in sizes from M6 to M36, these nuts are highly resistant to corrosion and oxidation, making them suitable for nuclear reactors and chemical devices.
The stainless steel 348 coupling nuts are designed to connect threaded rods in harsh environments. Sizes range from M6 to M36, making them ideal for applications in hot and humid environments, such as medical plants and power plants
Stainless steel 348 nylon insert nuts have nylon inserts for secure fastening. Available in sizes from M6 to M24, they offer high thermal stability and resistance, suitable for use in aerospace and industrial equipment.
Stainless steel 348 flange hex nuts for enhanced weight distribution with integrated flanges. Available in sizes from M6 to M24, these panels are used in complex applications such as furnace components and heat exchangers, providing strong support.
Heavy duty stainless steel 348 hex nuts are designed for high stress and high temperature environments. Available in sizes from M6 to M36, they are ideal for use in industrial equipment and nuclear reactors, providing exceptional strength and durability.
Stainless steel 348 square nuts provide large surface area for efficient torque application. Sizes range from M6 to M24, making it suitable for secure communications in hot environments, such as chemical applications and space applications.
Harsh Metalloys delivers quality Stainless Steel 348 Nuts with consistent performance, as tested under wide-ranging tests like hardness tests, spectro analysis, PMI, and flaring tests. In addition, micro and macro tests, pitting resistance, and IGC tests confirm that the nuts are of superior quality that we deliver. We ensure complete documentation, such as commercial invoices, packing lists showing net and gross weights, box numbers, and labels besides our testing protocols. Our legalized or attested Certificate of Origin along with Third-Party Inspection Certificates ensures our uncompromising commitment to delivering exceptional products and unparalleled customer satisfaction.
348 Nuts from Harsh Metalloys are ideal for high-temperature, corrosion-prone applications in industries such as chemical processing, heat exchangers, power plants, and aerospace. They are extensively used in equipment like boilers, superheaters, nuclear reactors, and furnace components, where thermal stability and resistance to oxidation are essential. Their ability to withstand repeated thermal cycling without degradation makes them suitable for welded assemblies and critical structural applications. 348 Nuts ensure secure, leak-proof connections in piping systems and machinery operating under aggressive environmental and thermal conditions, providing a dependable fastening solution for long-term industrial use.
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