Weston Stainless, Midland, UK, is a reliable supplier of stainless steel products of high quality, providing strong and corrosion-resistant solutions for industrial use. One of their top-of-the-line products is Stainless Steel 321/321H Fasteners, which are made for high-temperature and oxidation-resistant uses. These fasteners are of Grade 321 and 321H and come in different shapes, such as bolts, nuts, washers, screws, and studs. Made of stabilized austenitic stainless steel, it has titanium added to improve corrosion resistance in intergranular areas and increased strength at raised temperatures for best results in aerospace, thermal processing, and chemical applications where heat and stress resistance are paramount.
321/321H Stainless Steel Fasteners consist of Chromium (17-19%), Nickel (9-12%), Titanium (≥5xC), and restricted amounts of Carbon, Manganese, and Silicon. Grade 321 is low in carbon content, while 321H contains a slightly higher carbon percentage (0.04-0.10%) for enhanced strength at high temperature. These bolts have a tensile strength of approximately 515 MPa, yield strength of 205 MPa, and elongation of approximately 40%, providing optimum mechanical performance. Having a density of 7.9 g/cm³ with a melting range of 1400-1425°C, they provide greater thermal stability, oxidation resistance, and creep strength at high-temperature 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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Excellent resistance to oxidation and corrosion, particularly in high-temperature environments. They are typically available sizes from M6 to M36, with various thread standards. They are commonly used in aerospace and industrial applications where high temperatures are prevalent.
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.
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.
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.
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.
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 find extensive applications in heat and corrosion-resistant industries like aerospace, chemical processing, heat exchangers, and thermal power plants. They are best suited for fastening high-temperature equipment like furnace components, exhaust manifolds, expansion joints, and refineries. Stainless Steel 321/321H Fasteners are also used in cryogenic services, marine conditions, and gas turbines because of their superior oxidation resistance and structural integrity. Their resistance to stress and thermal cycling makes them the first choice in industries involving high-temperature and high-pressure operations, including nuclear reactors, boilers, and steam piping systems.
Weston Stainless provides Stainless Steel 321/321H Fasteners with test reports that guarantee their chemical composition, mechanical properties, and quality as per international standards. The fasteners are properly packed in wooden crates, plastic boxes, or special packaging to prevent corrosion and damage during shipping. They come in different sizes and specifications and are stored and shipped with complete traceability. Weston Stainless ensures prompt domestic and overseas delivery with strict quality control measures to offer high-performance fastening solutions for demanding industrial applications.
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