Stainless Steel 904L Fasteners are super-austenitic stainless steel fastening components made from UNS N08904 / EN 1.4539 material. Their high nickel, molybdenum and copper content provides excellent resistance to aggressive acids, chloride-containing environments, pitting, crevice corrosion and stress corrosion cracking. They are commonly used in chemical processing, petrochemical, marine, offshore, pharmaceutical and pollution-control equipment.
Stainless Steel 904L Fasteners Supplier | 904L Bolts, Nuts & Threaded Rods
Stainless Steel 904L Fasteners are high-alloy, low-carbon austenitic fasteners designed for demanding corrosive environments where conventional stainless steels may not provide sufficient resistance. Also known as Alloy 904L Fasteners, this super-austenitic grade contains high levels of nickel and molybdenum along with copper, providing excellent resistance to pitting, crevice corrosion, stress corrosion cracking, and aggressive acidic media.
904L is identified as UNS N08904, Werkstoff Nr. 1.4539, EN X1NiCrMoCu25-20-5, and 904S13. The combination of chromium, nickel, molybdenum and copper makes the alloy particularly suitable for sulfuric and phosphoric acid environments, chemical processing, seawater service, pollution-control equipment, and other highly corrosive applications.
We supply 904L Stainless Steel Bolts and Nuts, stud bolts, hex bolts, screws, threaded rods and other precision fasteners in standard and customized dimensions. Fasteners can be supplied according to applicable product, dimensional and customer specifications, with inspection documentation and testing as required.
Table of Contents
- ➤ Key Features and Benefits of 904L SS Fasteners
- ➤ Types of Stainless Steel 904L Fasteners
- ➤ Stainless Steel 904L Fasteners Specifications
- ➤ Chemical Composition of 904L Stainless Steel
- ➤ Mechanical and Physical Properties
- ➤ 904L Stainless Steel Fasteners Equivalent Grades
- ➤ ASTM and International Standards for 904L Fasteners
- ➤ Manufacturing Process of 904L SS Fasteners
- ➤ Applications of 904L Stainless Steel Fasteners
- ➤ Why Choose Us for 904L Stainless Steel Fasteners?
Key Features and Benefits of 904L SS Fasteners
904L SS Fasteners are selected when corrosion resistance is more important than using a conventional stainless steel grade.
- Excellent resistance to sulfuric and phosphoric acids.
- High resistance to pitting and crevice corrosion.
- Good resistance to chloride-induced stress corrosion cracking.
- High nickel content for improved corrosion performance.
- Molybdenum and copper improve resistance in aggressive chemical environments.
- Very low carbon content helps reduce sensitization after welding.
- Suitable for marine and seawater-related applications.
- Good toughness and ductility.
- Available in different fastener configurations and sizes.
- Suitable for demanding chemical, petrochemical and process environments.
904L is recognized as a super-austenitic stainless steel and has a high PREN, supporting its resistance to localized corrosion in chloride environments.
Types of Stainless Steel 904L Fasteners
We manufacture and supply different 904L SS Fasteners according to application, dimensions and customer requirements.
- 904L Stainless Steel Hex Bolts
- 904L Stainless Steel Hex Nuts
- UNS N08904 Stud Bolts
- UNS N08904 Hex Bolts
- 904L Heavy Hex Bolts
- 904L Heavy Hex Nuts
- 904L SS Threaded Rod
- 904L Stainless Steel Screws
- Werkstoff Nr 1.4539 Screws
- 904L Washers
- 904L U-Bolts
- 904L Anchor Bolts
- 904L Socket Head Cap Screws
- 904L Self-Tapping Screws
- Custom-made 904L Fasteners
Fasteners can be supplied with metric or imperial threads, different head configurations, thread pitches and surface finishes based on drawings or purchase specifications.
Stainless Steel 904L Fasteners Specifications
| Property | 904L / UNS N08904 |
|---|---|
| Material Grade | 904L |
| UNS | N08904 |
| Werkstoff Number | 1.4539 |
| EN Designation | X1NiCrMoCu25-20-5 |
| British Grade | 904S13 |
| Structure | Super Austenitic Stainless Steel |
| Product Forms | Bolts, Nuts, Studs, Screws, Threaded Rods, Washers |
| Thread | Metric / Imperial / UNC / UNF / Custom |
| Manufacturing | Cold Forged / Hot Forged / Machined |
| Finish | Plain, Pickled, Passivated, Custom |
Note: Standards are selected according to the actual product form and customer specification.
Chemical Composition of 904L Stainless Steel
| Element | Typical / Specified Range (%) |
|---|---|
| Carbon (C) | ≤ 0.020 |
| Chromium (Cr) | 19.0–21.0* |
| Nickel (Ni) | 24.0–26.0* |
| Molybdenum (Mo) | 4.0–5.0 |
| Copper (Cu) | 1.2–2.0 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 0.70 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.010 |
| Nitrogen (N) | ≤ 0.15 |
*Composition limits can vary with the applicable product standard. Always refer to the material certificate and governing specification for the supplied product.
Mechanical and Physical Properties of ASTM B649 904L Fasteners
Typical room-temperature properties for 904L material include:
| Property | Typical Value |
|---|---|
| Tensile Strength | 530–730 MPa* |
| Yield Strength, 0.2% | ≥ 230 MPa* |
| Elongation | ≥ 35%* |
| Density | Approximately 8.0 g/cm³ |
| Elastic Modulus | Approximately 195 GPa |
| Structure | Austenitic |
| Corrosion Resistance | Excellent |
*Values depend on the applicable product form, heat treatment and specification.
904L Stainless Steel Fasteners Equivalent Grades
| Standard / System | Equivalent Designation |
|---|---|
| UNS | N08904 |
| EN | X1NiCrMoCu25-20-5 |
| Werkstoff No. | 1.4539 |
| AISI | 904L |
| British | 904S13 |
| INOX | 904L |
These designations identify the same general 904L material family, but purchasing specifications should always be checked against the required product standard.
ASTM and International Standards for 904L Fasteners
| Topic | Details |
|---|---|
| ASTM B649 904L Fasteners | Customers may encounter ASTM B649 904L Fasteners in specifications because ASTM B649 historically covered UNS N08904 bar and wire. However, ASTM has subsequently moved UNS N08904 products into stainless-steel specifications such as ASTM A479/A479M and ASTM A484/A484M. The current ASTM B649-26 scope no longer covers UNS N08904. |
| ASTM A193 904L Bolts / ASME SA193 904L Studs | ASTM A193 904L Bolts and ASME SA193 904L Studs may appear in project or procurement terminology. Since ASTM A193 has specific listed grades and classes, the exact 904L material designation and applicable product standard should be confirmed before ordering rather than assuming compatibility with every A193 grade. |
| Supply & Manufacturing Capability | We can manufacture or supply fasteners against customer drawings, specifications and applicable standards, with material test certificates and third-party inspection where required. |
Manufacturing Process of 904L SS Fasteners
Applications of 904L Stainless Steel Fasteners
Because of its resistance to aggressive chemicals and localized corrosion, 904L is used in applications where fasteners may be exposed to demanding service conditions.
- Chemical processing equipment
- Sulfuric and phosphoric acid handling systems
- Petrochemical plants
- Oil & gas equipment
- Fertilizer plants
- Marine and seawater systems
- Offshore equipment
- Pollution-control equipment
- Pulp and paper processing
- Pharmaceutical equipment
- Heat exchangers
- Desalination systems
- Water-treatment equipment
- Food-processing equipment
- Process piping and plant engineering
904L is particularly associated with chemical, petrochemical, offshore, seawater and acidic-service applications.
Why Choose Us for 904L Stainless Steel Fasteners?
As an experienced SS 904L Fasteners Manufacturer, 904L Stainless Steel Fasteners Supplier and Stainless Steel 904L Fasteners Exporter, we focus on supplying material that matches the technical and dimensional requirements of each project.
- Wide range of 904L fastener types and sizes.
- Custom dimensions available.
- Metric and imperial thread options.
- Material traceability.
- Material Test Certificates available.
- Third-party inspection support.
- Export packing suitable for international shipments.
- Competitive pricing for bulk requirements.
- Support for urgent and project-based requirements.
- Supply for domestic and international customers.
Whether you require UNS N08904 Stud Bolts, UNS N08904 Hex Bolts, INOX 904L Screws, 904L SS Threaded Rod or customized fastening components, we can help identify the appropriate material and specification for your application.
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
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Frequently Asked Questions
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