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Stainless Steel 321 Fasteners are designed to provide exceptional performance in high-temperature and corrosive environments. These fasteners are widely used in industrial, chemical, and power generation applications due to their superior durability and resistance to oxidation.
Manufactured from premium-grade SS 321 material, these fasteners offer excellent thermal stability. They can withstand extreme temperatures up to 1150°C, making them ideal for furnace, heat exchanger, and boiler applications.
Our Stainless Steel 321 Fasteners include a wide range of products such as bolts, nuts, screws, studs, and washers. Each item is precision-engineered to ensure a secure fit and long-lasting performance in demanding industrial settings.
Corrosion resistance is a key feature of SS 321 Fasteners. The high chromium and nickel content in the alloy protects the fasteners from rust and chemical attack, even in harsh environments involving acids, alkalis, or salts.
These fasteners exhibit excellent mechanical properties including high tensile strength, hardness, and resistance to thermal expansion. This ensures that assemblies remain stable and safe under mechanical stress and extreme temperatures.
Stainless Steel 321 Fasteners are available in various sizes and thread types, catering to both standard and customized industrial requirements. They are suitable for applications ranging from petrochemical plants to aerospace equipment.
The manufacturing process of SS 321 Fasteners adheres to international quality standards, including ASTM, ASME, and ISO certifications. This guarantees consistent quality, reliability, and safety for all industrial applications.
Ease of installation and maintenance makes Stainless Steel 321 Fasteners a preferred choice for engineers and technicians. Their robust construction reduces the need for frequent replacement, minimizing downtime and operational costs.
Specification Table
| Property | Specification / Value |
|---|---|
| Material Grade | Stainless Steel 321 (SS 321) |
| Type | Bolts, Nuts, Screws, Studs, Threaded Rods |
| Standard | ASTM A193, ASTM A194, ISO 3506 |
| Temperature Resistance | Up to 870°C (1598°F) |
| Corrosion Resistance | Excellent resistance to oxidizing environments and intergranular corrosion |
| Surface Finish | Polished, Passivated, Plain, Zinc Plated |
| Thread Type | Metric (M), UNC/UNF, BS, DIN Standards |
| Applications | Industrial, Chemical, Petrochemical, Automotive, Aerospace |
| Dimensions | Custom sizes available as per client requirement |
| Certification | ISO 9001, EN 10204, Material Test Certificate (MTC) |
Chemical Composition (Typical ranges for SS321)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Manganese (Mn) | 2.0 max |
| Silicon (Si) | 1.0 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.03 max |
| Titanium (Ti) | 5 × C min – 0.70 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Unit | Value |
|---|---|---|
| Tensile Strength | MPa | 515 - 827 |
| Yield Strength | MPa | 205 - 450 |
| Elongation (in 50mm) | % | 40 - 50 |
| Hardness (Brinell) | HB | 150 - 200 |
| Impact Strength | J | 80 - 100 |
| Modulus of Elasticity | GPa | 193 - 200 |
| Poisson's Ratio | – | 0.27 - 0.30 |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| AISI / SAE | 321 |
| ASTM | ASTM A276 / A479 321 |
| EN / DIN | 1.4541 / X6CrNiTi18-10 |
| JIS | STS321 |
| GB / Chinese Standard | 0Cr18Ni9Ti |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Size (mm) | Thread Pitch (mm) | Length (mm) | Head Diameter (mm) | Weight (kg per 100 pcs) |
|---|---|---|---|---|
| M6 | 1.0 | 10-100 | 10 | 1.2 |
| M8 | 1.25 | 16-120 | 13 | 2.5 |
| M10 | 1.5 | 20-150 | 17 | 5.0 |
| M12 | 1.75 | 25-200 | 19 | 7.8 |
| M16 | 2.0 | 30-250 | 24 | 15.0 |
| M20 | 2.5 | 35-300 | 30 | 25.0 |
Common Types Of Fasteners
Bolts
Nuts
Steel Screw
Washer
Stud Bolts
Frequently Asked Questions (FAQ)
What is Stainless Steel 321 Fastener?
Stainless Steel 321 Fasteners are austenitic stainless steel fasteners stabilized with titanium to resist intergranular corrosion, suitable for high-temperature applications.
What are the typical applications of SS 321 Fasteners?
They are widely used in aerospace, chemical, petrochemical, food processing, and high-temperature equipment where corrosion resistance and heat resistance are essential.
What are the mechanical properties of SS 321 Fasteners?
They typically have a tensile strength of 515–827 MPa, yield strength of 205–450 MPa, elongation of 40–50%, and hardness of 150–200 HB.
What are the equivalent grades of SS 321 Fasteners?
Equivalent grades include AISI 321, ASTM A276 / A479 321, EN 1.4541 / X6CrNiTi18-10, JIS STS321, and GB 0Cr18Ni9Ti.
Are SS 321 Fasteners suitable for high-temperature use?
Yes, SS 321 fasteners are stabilized with titanium, making them ideal for continuous service at temperatures up to 900°C and intermittent exposure up to 925°C.
Pipes & Tubes Supplier
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Pipes & Tubes Exporter
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