Table of Contents
- SS 904L Nuts Overview
- SS 904L Nuts Specifications
- What are Stainless Steel 904L Nuts?
- SS 904L Technical Properties & Composition
- Why Industries Prefer SS 904L Series Nuts
- Types of SS 904L Series Nuts
- Key Advantages of UNS N08904 Series Nuts
- Key Applications of SS UNS N08904 Series Nuts
- SS 904L Nuts vs SS 316L Nuts
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
SS 904L Nuts Suppliers & Exporters
Aurum Overseas is a premier SS 904L Nuts Supplier and specialized SS 904L Nuts Exporter. Engineered with high levels of nickel (23%–28%), chromium (19%–23%), molybdenum (4%–5%), and copper (1%–2%), these high-alloy austenitic fasteners provide maximum resistance to severe sulfuric acid, chloride pitting, and stress corrosion cracking.
Manufactured in full compliance with ASTM B649 SS 904L Nuts specifications, these non-magnetic components provide exceptional dimensional integrity across harsh media. As a trusted SS 904L Nuts Exporter, Aurum Overseas delivers fully certified bolting solutions across the USA, Germany, UK, UAE, Saudi Arabia, and Qatar.
SS 904L Nuts Specifications
| Parameter | Specification / Technical Range |
|---|---|
| Material Grade | Stainless Steel 904L / UNS N08904 |
| UNS Number | UNS N08904 |
| Werkstoff Number | 1.4539 |
| Manufacturing Standards | ASTM B649, ASME SB649, ASTM A240, DIN 934, ISO 4032, BS |
| Size Range | M3 to M100 | 3/16" to 4" | Custom Sizes Available |
| Length Range | 3 mm to 200 mm | Custom Lengths Available |
| Thread Configuration | ASME B1.1 2A/3A - 2B/3B Unified (UNC, UNF) & B1.13M 6h-6G Metric |
| Special Fastener Formats | SS 904L Hex Head Nuts, SS 904L Square Nuts, SS 904L T Nuts, SS 904L Eye Nuts |
| Surface Finishes | Bright Polished, Passivated, Solution Annealed, Electro-polished |
| Certifications | EN 10204 3.1 Material Test Certificate, NACE MR0175 / ISO 15156 Compliant |
What are Stainless Steel 904L Nuts?
Stainless Steel 904L (UNS N08904 / 1.4539) nuts are high-alloy austenitic fasteners enriched with 1.0%–2.0% copper and 4.0%–5.0% molybdenum. They provide outstanding resistance to dilute sulfuric acid, phosphoric acid, and chloride-induced pitting in harsh chemical environments where standard 300-series grades fail.
SS 904L Technical Properties & Composition
The chemical composition and mechanical properties of SS 904L are precisely engineered to deliver maximum resistance to sulfuric acid attack, chloride pitting, and stress corrosion cracking in the most aggressive industrial chemical service environments.
Chemical Composition of UNS N08904 Nuts (%)
| Element | Percentage |
|---|---|
| Carbon (C) | 0.020 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 19.00 - 23.00 |
| Molybdenum (Mo) | 4.00 - 5.00 |
| Nickel (Ni) | 23.00 - 28.00 |
| Copper (Cu) | 1.00 - 2.00 |
Mechanical Properties of SS 904L Nuts
| Property / Parameter | Value / Technical Range |
|---|---|
| Density | 7.95 g/cm³ |
| Melting Point | 1350°C (2460°F) |
| Tensile Strength | 490 MPa (71,000 psi) min |
| Yield Strength (0.2% Offset) | 220 MPa (32,000 psi) min |
| Elongation (% in 50mm) | 35% min |
Equivalent Grades of SS 904L Nuts
| Standard | Werkstoff Nr. | UNS | JIS | EN |
|---|---|---|---|---|
| SS 904L | 1.4539 | N08904 | SUS 904L | X1NiCrMoCu25-20-5 |
Why Industries Prefer SS 904L Series Nuts
Chemical process engineers specify UNS N08904 Nuts for aggressive acid environments where lower-alloy stainless steels rapidly pit and crack.
The combination of 25% nickel and 1.5% copper makes ASTM B649 SS 904L Nuts resistant to hot sulfuric acid across full concentration ranges at moderate temperatures. As a certified SS 904L Nuts Supplier and SS 904L Nuts Exporter, Aurum Overseas delivers these corrosion-resistant components to chemical plants, fertilizer facilities, and seawater desalination complexes globally.
Types of SS 904L Series Nuts
Aurum Overseas supplies a comprehensive range of stainless steel nut configurations manufactured according to standard DIN, ASME, and ISO dimensional tolerances for multiple engineering assemblies.
SS 904L Hex Head Nuts
SS 904L Square Nuts
SS 904L Lock Nuts
SS 904L Eye Nuts
SS 904L Wing Nuts
SS 904L T Nuts
SS 904L Panel Nuts
SS 904L Coupling Nuts
SS 904L Heavy Hex Nuts
Key Advantages of UNS N08904 Series Nuts
Sulfuric Acid Resistance
Added copper provides strong protection against pure and diluted sulfuric acid solutions.
Resists Chloride Pitting
High molybdenum content (4.0% to 5.0%) prevents localized pitting in brackish water and sea water.
Immunity to Stress Cracking
High nickel levels (23% to 28%) stop stress corrosion cracking in warm chloride environments.
Fully Non-Magnetic
Maintains its non-magnetic properties even after cold working and machining.
Prevents Weld Decay
Ultra-low carbon content prevents carbide precipitation during welding for stronger joint integrity.
Key Applications of SS UNS N08904 Series Nuts
Our stainless steel 904L nuts are deployed globally in chemical processing plants, fertilizer production facilities, desalination infrastructure, and flue gas desulfurization systems.
| Industry Sector | Primary Fastener Application |
|---|---|
| Chemical Processing | Sulfuric acid production piping, heat exchangers, and pickling tank bolting |
| Fertilizer Production | Phosphoric acid reactors, evaporators, and fertilizer mixer flange joints |
| Desalination & Marine | High-pressure reverse osmosis piping, pumps, and subsea flange assembly |
| Pulp & Paper Manufacturing | Bleach plant washers, tall oil distillation units, and digester bolting |
| Flue Gas Desulfurization (FGD) | Power plant scrubber systems, mist eliminators, and duct absorber joints |
SS 904L Nuts vs SS 316L Nuts
When selecting the ideal stainless fastener grade for aggressive chemical environments, understanding the performance differences between SS 904L and SS 316L is essential.
| Comparison Factor | SS 904L Nuts | SS 316L Nuts |
|---|---|---|
| Alloy Content | High Alloy (25% Ni, 4.5% Mo, 1.5% Cu) | Standard Alloy (10% Ni, 2.0% Mo, 0% Cu) |
| Sulfuric Acid Performance | Excellent resistance across broad temperature ranges | Poor resistance; prone to rapid corrosion |
| Pitting Resistance (PREN) | High resistance to chlorides (PREN >= 34) | Moderate resistance to chlorides (PREN approx. 25) |
| Stress Corrosion Cracking | High nickel prevents chloride-induced stress cracking | Vulnerable to cracking in warm chloride solutions (> 60°C) |
| Cost & Application | Premium grade for severe chemical processing | Standard grade for general corrosion applications |
| Detailed Specifications | Current Page | View SS 316L Nuts Specs → |
Quality Testing & Inspection
Aurum Overseas maintains comprehensive quality control procedures to ensure all hardware shipped by our team as an SS 904L Nuts Supplier and SS 904L Nuts Exporter meets critical chemical processing demands.
| Test / Inspection Standard | Technical Verification Scope |
|---|---|
| Positive Material Identification (PMI) | XRF testing verifying Ni, Cr, Mo, and Cu levels per ASTM B649 |
| Intergranular Corrosion Testing | ASTM A262 Practice C / E verifying intergranular corrosion immunity |
| Dimensional Inspection | Thread pitch, profile, and concentricity check per ASME B18.2.2 |
| Mechanical Strength Verification | Tensile, yield offset, and elongation testing to certified minimums |
| Certifications | Full material traceability with EN 10204 3.1 certification |
Global Export Markets
As an international SS 904L Nuts Exporter, Aurum Overseas supplies precision-packaged, certified fasteners to industrial project sites worldwide.
USA
Canada
Mexico
Germany
United Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
The addition of 1.0% to 2.0% copper combined with 23% to 28% nickel provides high resistance to sulfuric acid solutions at various concentrations and temperatures.
Yes, due to their high nickel and chromium content, UNS N08904 nuts maintain a fully austenitic microstructure and remain non-magnetic in all conditions.
Aurum Overseas manufactures SS 904L Hex Head Nuts, SS 904L Square Nuts, SS 904L T Nuts, and heavy SS 904L Eye Nuts engineered to custom drawings.
Yes, Aurum Overseas regularly exports certified SS 904L fasteners to processing plants across the USA, European markets (Germany, UK, France), and GCC countries (UAE, Saudi Arabia, Qatar).
Yes, every order shipped by Aurum Overseas includes complete EN 10204 3.1 Mill Test Certificates detailing heat chemistry, mechanical offset values, and full batch traceability.
Contact Aurum Overseas
Aurum Overseas delivers prompt quotes, mill test reports, and export shipping for high-alloy fastener applications.
Contact our technical sales team for immediate assistance.