Stainless Steel 321H Fasteners are high-temperature austenitic stainless steel fasteners manufactured from titanium-stabilized 321H stainless steel, identified as UNS S32109, AISI 321H and Werkstoff No. 1.4878. The higher carbon content of 321H provides improved strength and creep resistance at elevated temperatures compared with standard 321 stainless steel. These fasteners are used in power generation, petrochemical, chemical processing, heat exchangers, furnace equipment and other demanding applications.
Stainless Steel 321H Fasteners – High-Temperature Stainless Steel Bolting
We supply SS 321H Fasteners in bolts, nuts, stud bolts, screws, threaded rods, washers and other customized configurations. Products can be supplied to applicable ASTM, ASME, DIN, ISO and other international dimensional requirements based on the project specification.
What Are SS 321H Fasteners?
SS 321H Fasteners are manufactured from a heat-resistant titanium-stabilized austenitic stainless steel. The "H" grade has a controlled higher carbon range, generally around 0.04–0.10%, which helps provide greater high-temperature strength and creep resistance.
The alloy contains approximately 17–19% chromium and 9–12% nickel, with titanium added for stabilization. This combination gives 321H good corrosion resistance, oxidation resistance and performance under elevated-temperature service.
Unlike standard 321, which is commonly identified as UNS S32100 / 1.4541, 321H is identified as UNS S32109 / 1.4878. This distinction is important when selecting bolting for high-temperature equipment.
Table of Contents
- ➤ What Are SS 321H Fasteners?
- ➤ Key Features and Benefits of 321H Stainless Steel Bolts and Nuts
- ➤ Types of Stainless Steel 321H Fasteners
- ➤ Stainless Steel 321H Fasteners Specifications
- ➤ Chemical Composition of Stainless Steel 321H
- ➤ Mechanical and Physical Properties
- ➤ Equivalent Grades of 321H Stainless Steel
- ➤ Manufacturing Process of SS 321H Fasteners
- ➤ Applications of 321H Stainless Steel Fasteners
- ➤ Why Choose Us as a 321H Stainless Steel Fasteners Supplier?
- ➤ Request a Quote for Stainless Steel 321H Fasteners
Key Features and Benefits of 321H Stainless Steel Bolts and Nuts
- High-temperature strength: Higher carbon content supports improved strength during elevated-temperature service.
- Excellent creep resistance: Suitable for components subjected to prolonged heat and mechanical loading.
- Titanium stabilization: Titanium helps reduce susceptibility to intergranular corrosion associated with carbide precipitation.
- Good oxidation resistance: 321H can be used for heat-resistant components and is reported as scale-resistant up to approximately 850°C in suitable environments.
- Good corrosion resistance: Provides reliable resistance in many industrial and moderately corrosive environments.
- Excellent fabrication characteristics: The austenitic structure provides good machinability and formability considerations for fastener production.
- Long service life: Appropriate material selection can reduce maintenance and replacement requirements.
- Suitable for critical assemblies: Available with inspection and material documentation according to project requirements.
Types of Stainless Steel 321H Fasteners
We offer a wide range of 321H Stainless Steel Bolts and Nuts for industrial fastening requirements:
➤ UNS S32109 Stud Bolts
321H stud bolts are commonly used for flange connections, pressure vessels, valves, heat exchangers and high-temperature piping systems. They can be supplied fully threaded or with specified thread lengths.
➤ UNS S32109 Hex Bolts
Hex head bolts provide convenient installation using standard tools and are available in metric and imperial dimensions.
➤ ASTM A193 Grade 321H Fasteners
Where the applicable procurement specification calls for high-temperature alloy or stainless steel bolting, we can supply fasteners against the required ASTM/ASME specification and grade, subject to the applicable product standard and certification requirements.
➤ ASTM A194 321H Nuts
Matching nuts are supplied for compatible bolting assemblies. The exact ASTM A194 grade should be confirmed against the applicable material and project specification rather than assumed from the bolt grade.
➤ DIN 1.4878 Bolts & Werkstoff Nr 1.4878 Screws
Fasteners manufactured from Werkstoff 1.4878 / AISI 321H / UNS S32109 can be supplied in DIN-style dimensions, metric threads and customized configurations.
➤ Threaded Rods, Washers and Custom Fasteners
We can also supply threaded rods, washers and specially manufactured fasteners according to drawings, dimensions, thread specifications and application requirements.
Stainless Steel 321H Fasteners Specifications
| Specification | Details |
|---|---|
| Material Grade | Stainless Steel 321H |
| UNS | S32109 |
| AISI | 321H |
| Werkstoff No. | 1.4878 |
| EN/DIN Material | X8CrNiTi18-10 / related designation depending on standard |
| Product Forms | Bolts, nuts, stud bolts, screws, threaded rods, washers |
| Threads | Metric, UNC, UNF, BSW, BSF and customized |
| Standards | ASTM, ASME, DIN, ISO, BS and customer specifications |
| Manufacturing | Forged, cold formed, hot forged or machined as applicable |
| Finish | Plain, passivated, polished or customized |
| Certification | EN 10204 3.1 MTC and third-party inspection when required |
Chemical Composition of Stainless Steel 321H
Values can vary according to the governing product specification and form.
| Element | Typical/Specified Range, % |
|---|---|
| Carbon (C) | 0.04–0.10 |
| Chromium (Cr) | 17.0–19.0 |
| Nickel (Ni) | 9.0–12.0 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.015 |
| Titanium (Ti) | 5 × C minimum, up to 0.80 |
| Iron (Fe) | Balance |
Mechanical and Physical Properties of ASME SA193 321H Stud Bolts
| Property | Typical Reference Value |
|---|---|
| Density | Approx. 7.9 g/cm³ |
| Tensile Strength | Approx. 500–720 MPa* |
| 0.2% Proof Strength | Approx. 190 MPa* |
| Elongation | Approx. 40%* |
| Structure | Austenitic |
| Heat Resistance | Scaling resistance up to approx. 850°C in suitable service |
*Values are material/product-form references and should not be treated as fastener acceptance values unless specified by the applicable fastener standard.
Equivalent Grades of 321H Stainless Steel
321H is distinct from standard 321, which is commonly identified as UNS S32100 / 1.4541.
| Standard | Equivalent / Designation |
|---|---|
| UNS | S32109 |
| AISI | 321H |
| Werkstoff No. | 1.4878 |
| DIN | X8CrNiTi18-10 |
| EN | 1.4878 |
| Material Family | Titanium-stabilized austenitic stainless steel |
Manufacturing Process of SS 321H Fasteners
Applications of 321H Stainless Steel Fasteners
Because of their combination of corrosion resistance and elevated-temperature performance, 321H Fasteners are suitable for applications such as:
- Power generation plants
- Petrochemical and refinery equipment
- Chemical processing plants
- Heat exchangers and condensers
- Furnace and heat-treatment equipment
- High-temperature piping systems
- Industrial boilers and thermal equipment
- Aerospace and aircraft exhaust-related systems
- Oil and gas processing equipment
- Pressure vessels and process equipment
Material 1.4878 is specifically associated with heat-resistant construction components, furnace equipment, apparatus construction and power-related applications.
Why Choose Us as a 321H Stainless Steel Fasteners Supplier?
As a 321H Stainless Steel Fasteners Supplier, Stainless Steel 321H Fasteners Exporter and SS 321H Stud Bolt Stockist, we focus on supplying fasteners that match the technical and commercial requirements of each project.
What We Offer- Wide range of SS 321H fastener configurations
- Metric and imperial dimensions
- Standard and customized fasteners
- Material traceability and inspection documentation
- Third-party inspection support
- Competitive pricing for bulk requirements
- Export packing for international shipments
- Support for industrial, EPC and OEM requirements
- Fast response to technical and quotation inquiries
For related piping requirements, customers can also explore our Stainless Steel 321 Flanges range and other stainless steel industrial products.
Related Stainless Steel Fasteners
We also supply:
- Stainless Steel 304 fasteners
- Stainless Steel 304l Fasteners
- Stainless Steel 304H Fasteners
- Stainless Steel 309 Fasteners
- Stainless Steel 309S Fasteners
- Stainless Steel 309H Fasteners
- Stainless Steel 310 Fasteners
- Stainless Steel 310S Fasteners
- Stainless Steel 310H Fasteners
- Stainless Steel 316 Fasteners
- Stainless Steel 316L Fasteners
- Stainless Steel 316H Fasteners
- Stainless Steel 316TI Fasteners
- Stainless Steel 317 Fasteners
- Stainless Steel 317L Fasteners
- Stainless Steel 321 Fasteners
- Stainless Steel 321H Fasteners
- Stainless Steel 347 Fasteners
- Stainless Steel 347H Fasteners
- Stainless Steel 410 Fasteners
- Stainless Steel 446 Fasteners
- Stainless Steel 904L Fasteners
Request a Quote for Stainless Steel 321H Fasteners
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Send us your required size, quantity, fastener type, thread specification, applicable ASTM/ASME/DIN standard, pressure/temperature service and delivery destination. Our team can review the requirement and provide the appropriate material and commercial proposal.
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Frequently Asked Questions About Stainless Steel 321H Fasteners
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