Harsh Metalloys has built a solid reputation as a reliable manufacturer and supplier in Mumbai, India, specializing in high-quality Stainless Steel 321 / 321H Fasteners. These fasteners are engineered to excel in high-temperature and corrosive settings. SS 321 is a titanium-stabilized austenitic stainless steel, while SS 321H is its high-carbon counterpart, providing enhanced strength under elevated temperatures. Crafted to meet ASTM and ASME standards, these fasteners come in various forms such as bolts, nuts, washers, and studs. With outstanding weldability, oxidation resistance, and structural integrity, 321/321H fasteners are perfect for industries like aerospace, chemical processing, and thermal equipment.
Stainless Steel 321 / 321H Fasteners are made up of 17–19% Chromium, 9–12% Nickel, and Titanium for stabilization. The SS 321H variant features a higher carbon content (up to 0.10%) to boost creep strength and performance in high-temperature scenarios. These fasteners boast a tensile strength ranging from 515–750 MPa and a yield strength of about 205 MPa. They maintain their mechanical properties at temperatures as high as 870°C (1600°F) and offer excellent resistance to intergranular corrosion, oxidation, and thermal fatigue. Plus, their non-magnetic nature when annealed makes them suitable for a variety of industrial applications.
Specification : ASTM F593, F594, F1554 / ASME SF593, F594, F1554
Standard : DIN, ASTM, BS and all International Standards
Bolt / Screw Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Nuts Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Washers Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Machine Screws Size : M1.6 – M12
Self Tapping Screw Size : No.2 – No. 14
Length : 3 mm to 200 mm
Types : Nuts, Bolts, Screws, Stud Bolts, Hex Set Screw, Socket Screw, Cap Screw, Pan Head Screw, Machine Screw, Socket Head Cap Screw, Allen Cap screw, Wing Screw, Washers, Spring Washers, Studs, Anchors, Marine Anchors, Nut, Hexagon Nut, Hex Nut, Hex Coupling Nut, Hex Domed Cap Nuts, Square Nut, Stud Bolts, Hex Head Bolts, Socket Hexagon Head Screw Anchor Bolt, U- Bolts, J Bolts, Mushroom Head Square Neck Bolts, T-Head Bolts, Wing Screw, Eye Bolt, Foundation Bolts, Structural Bolts.
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
| SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 5(C+N) – 0.70 max |
| SS 321H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 4(C+N) – 0.70 max |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1457 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
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SS 321 nuts offer excellent resistance to intergranular corrosion and high-temperature oxidation, ideal for aerospace, chemical processing, and exhaust manifold applications.
Stainless Steel 321H Stud Bolts provide outstanding oxidation and chemical corrosion resistance, especially in high-temperature conditions. They usually come in lengths from 50 mm to 300 mm and diameters from M8 to M30. Ideal for high-stress environments in chemical processing and aerospace industries.
Stainless Steel 321H Bolts offer high resistance to corrosion and oxidation in elevated temperatures. They are available in sizes ranging from M6 to M36, tailored to specific length requirements, and are widely used in structural and high-temperature applications.
Stainless Steel 321 and 321H threaded rods are designed to resist corrosion and oxidation in harsh environments. They typically come in lengths from 100 mm to 1000 mm and diameters from M6 to M30. Suitable for structural and high-temperature applications.
Stainless Steel 321 screws provide excellent resistance to rust and oxidation, especially at elevated temperatures. They are available in various sizes from M2 to M20 and are often used in applications where resistance to heat and corrosion is critical.
Stainless Steel 321H washers offer strong resistance to corrosion and high temperatures. They come in sizes that match common bolt and nut dimensions, typically from M6 to M36. It is ideal for use in high-temperature applications and aggressive environments.
Stainless Steel 321 / 321H Fasteners are extensively used in industries requiring components that can endure high heat and corrosive atmospheres. Common applications include fastening elements in heat exchangers, boiler systems, exhaust systems, furnace parts, and chemical process vessels. These fasteners are particularly effective in aerospace, petrochemical, power generation, and thermal processing industries. Their resistance to oxidation and intergranular corrosion after welding makes them a preferred choice for structural and pressure-bound applications. The added creep strength of 321H ensures stable and reliable fastening under prolonged exposure to elevated temperatures and thermal cycling.
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