Harsh Metalloys is a trusted manufacturer and supplier of 348 Fasteners, located in Mumbai, India. We provide premium-grade stainless steel fasteners made from SS 348—a niobium-stabilized austenitic stainless steel known for its excellent corrosion resistance, high-temperature strength, and superior weldability. Our 348 fasteners are engineered for durability and stability in extreme conditions, including thermal cycling and corrosive environments. Manufactured to meet global quality standards, these fasteners are used across diverse industries such as chemical processing, heat exchangers, power generation, and refineries. At Harsh Metalloys, we focus on delivering precision products with reliability, performance, and timely delivery.
SS 348 Fasteners are composed of 17–20% chromium, 8–13% nickel, and stabilized with niobium (columbium) to prevent carbide precipitation. This stabilization enhances their resistance to intergranular corrosion, especially after welding or prolonged exposure to high temperatures. These fasteners deliver tensile strength between 515–760 MPa and a yield strength of ≥205 MPa. With excellent mechanical stability at elevated temperatures, SS 348 offers good ductility, formability, and oxidation resistance. Non-magnetic in the annealed condition, these fasteners retain structural integrity and corrosion resistance in high-stress, high-heat industrial environments.
| 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 offer exceptional corrosion resistance, particularly in harsh environments. They are available in various sizes, typically from M3 to M30, with standard dimensions conforming to ISO or ANSI specifications, ensuring secure fastening in industrial applications.
Stainless Steel 348 Stud Bolts provide superior corrosion resistance and are ideal for high-temperature applications. They usually come in sizes from M6 to M36 and lengths from 50 mm to 300 mm, meeting industrial standards for strength and durability.
Stainless Steel 348 Bolts are known for their high corrosion resistance and high-temperature performance. They are available in sizes from M6 to M30 and can be found in various lengths, complying with ANSI or ISO standards, and are suitable for heavy-duty applications.
Stainless Steel 348 Threaded Rods offer excellent resistance to oxidation and corrosion. They are commonly available in diameters from M6 to M30 and lengths ranging from 100 mm to 1000 mm. They are used in applications requiring continuous threading and high strength.
Stainless Steel 348 Screws provide robust corrosion resistance, particularly in aggressive environments. Available in sizes from M3 to M20 and lengths from 10 mm to 100 mm, they are used for precise and secure fastening in various mechanical assemblies.
Stainless Steel 348 Washers offer superior corrosion resistance and are used to distribute the load of a screw or bolt. They come in sizes from M4 to M36 and various thicknesses, adhering to standard dimensions for reliable performance in harsh conditions.
We provide essential documents such as commercial invoices, packaging lists, certificates of origin, and guarantee letters to ensure smooth transactions. Additionally our Third Party Inspection Certificate guarantees the quality and compliance of our products, ensuring complete client satisfaction. These documents are vital for transparency, traceability and assurance of the product’s quality and origin offering our clients peace of mind and confidence in their purchases.
348 Fasteners from Harsh Metalloys are ideal for critical applications in chemical plants, nuclear reactors, heat exchangers, power generation units, and aerospace equipment. They are designed to perform reliably under continuous exposure to high temperatures, pressure, and corrosive agents. Common uses include assembling boilers, superheaters, thermal processing systems, and refinery infrastructure. Their ability to resist intergranular corrosion and thermal degradation makes them suitable for use in welded structures and dynamic systems undergoing thermal cycling. SS 348 fasteners ensure secure, long-lasting connections in challenging environments, making them a dependable choice for industrial fastening solutions.
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