Table of Contents
- SS 304/304L/304H Nuts Overview
- SS 304/304L/304H Nuts Specifications
- What are Stainless Steel 304/304L/304H Nuts?
- SS 304 / 304L / 304H Technical Properties & Composition
- Why Industries Prefer SS 304 Series Nuts
- Types of SS 304 Series Nuts
- Key Advantages of UNS S30400 / S30403 Series Nuts
- Key Applications of SS UNS S30400 Series Nuts
- SS 304 Nuts vs SS 316 Nuts
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
SS 304 / 304L / 304H Nuts Suppliers & Exporters
Aurum Overseas is a global manufacturer, stockist, and exporter of high-grade Stainless Steel 304, 304L, and 304H Nuts. Manufactured in strict compliance with ASTM A194 Grade 8 / A2-70 standards, our industrial nuts provide exceptional thread integrity, anti-galling performance, and dependable corrosion resistance.
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Designed for high-stress structural, piping, and mechanical assemblies, these standard and heavy hex nuts serve critical engineering sectors. We maintain stock across metric and imperial sizes to support urgent projects across India, the USA, Canada, Europe, Germany, the UK, and the GCC region (UAE, Saudi Arabia, Qatar, Kuwait, Oman, Bahrain).
SS 304/304L/304H Nuts Specifications
| Parameter | Specification / Technical Range |
|---|---|
| Material Grades | SS 304, SS 304L, SS 304H |
| UNS Numbers | UNS S30400 (304), UNS S30403 (304L), UNS S30409 (304H) |
| Werkstoff Numbers | 1.4301 (304), 1.4306 / 1.4307 (304L), 1.4948 (304H) |
| Manufacturing Standards | ASTM A194 Grade 8, Grade 8A, ASTM A193, ASME B18.2.2, DIN 934, ISO 4032 |
| Property Classes | A2-50, A2-70, A2-80 |
| Metric Size Range | M2 to M100 |
| Inch Size Range | 1/4" to 4" |
| Thread Types | UNC, UNF, UNEF, Metric Coarse, Metric Fine, BSW |
| Surface Finishes | Passivated, Bright Polished, PTFE Coated, Cadmium Plated, Electro-polished |
| Customization | Custom thread pitch, oversized tapping, and custom height per drawing |
| Certifications | EN 10204 3.1 MTC, NACE MR0175 / ISO 15156, ISO 9001:2015 |
What are Stainless Steel 304/304L/304H Nuts?
Stainless Steel 304-series nuts belong to the 18/8 austenitic stainless steel alloy family, providing excellent mechanical strength and reliable corrosion resistance for general industrial applications.
- SS 304 (UNS S30400 / 1.4301): Standard austenitic grade for general industrial, architectural, and structural applications.
- SS 304L (UNS S30403 / 1.4306): Low-carbon variant (0.03% max C) designed to prevent intergranular corrosion in welded assemblies.
- SS 304H (UNS S30409 / 1.4948): High-carbon variant (0.04%–0.10% C) optimized for elevated-temperature service requiring superior creep strength.
SS 304 / 304L / 304H Technical Properties & Composition
The chemical composition and mechanical properties of the 304 series are calibrated to achieve the optimum balance between corrosion resistance, cold headability, thread integrity, and proof load capabilities.
Chemical Composition of UNS S30400 Nuts (%)
| Element | SS 304 | SS 304L | SS 304H |
|---|---|---|---|
| Carbon (C) | 0.08 max | 0.03 max | 0.04 – 0.10 |
| Manganese (Mn) | 2.00 max | 2.00 max | 2.00 max |
| Phosphorus (P) | 0.045 max | 0.045 max | 0.045 max |
| Sulfur (S) | 0.030 max | 0.030 max | 0.030 max |
| Silicon (Si) | 0.75 max | 0.75 max | 0.75 max |
| Chromium (Cr) | 17.50 – 19.50 | 17.50 – 19.50 | 18.00 – 20.00 |
| Nickel (Ni) | 8.00 – 10.50 | 8.00 – 12.00 | 8.00 – 11.00 |
| Nitrogen (N) | 0.10 max | 0.10 max | — |
Mechanical Properties of UNS S30400 Nuts
| Technical Parameter | SS 304 | SS 304L | SS 304H |
|---|---|---|---|
| Tensile Strength (MPa / Ksi) | 515 min / 75 min | 485 min / 70 min | 515 min / 75 min |
| Yield Strength 0.2% Proof (MPa / Ksi) | 205 min / 30 min | 170 min / 25 min | 205 min / 30 min |
| Elongation in 50mm (%) | 40 min | 40 min | 40 min |
| Hardness (Brinell / Rockwell B) | 201 HB max / 92 HRB max | 201 HB max / 92 HRB max | 201 HB max / 92 HRB max |
| Density (g/cm³) | 8.0 | 8.0 | 8.0 |
Equivalent Grades of SS 304 / 304L / 304H Nuts
| Grade | UNS | W.Nr. | EN Standard | JIS |
|---|---|---|---|---|
| SS 304 | S30400 | 1.4301 | X5CrNi18-10 | SUS 304 |
| SS 304L | S30403 | 1.4306 / 1.4307 | X2CrNi18-9 | SUS 304L |
| SS 304H | S30409 | 1.4948 | X6CrNi18-10 | SUS 304H |
Why Industries Prefer SS 304 Series Nuts
Industries prefer SS 304-series nuts because they offer an optimal ratio of mechanical performance to overall material cost. Their 18/8 alloy chemical matrix provides effective resistance against oxidation, organic acids, and atmospheric moisture without requiring expensive alloying elements like molybdenum.
Furthermore, SS 304L eliminates the need for post-weld heat treatment in welded assemblies, while SS 304H maintains elevated strength parameters up to 800°C (1472°F). Their broad compatibility with standard stud bolts and washers simplifies global procurement and maintenance inventory.
Types of SS 304 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 304 Hex Head Nuts
SS 304 Square Nuts
SS 304 Lock Nuts
SS 304 Eye Nuts
SS 304 Wing Nuts
SS 304 T Nuts
SS 304 Panel Nuts
SS 304 Coupling Nuts
SS 304 Dome Nuts
| Nut Configuration | Standard Specification | Typical Industrial Use |
|---|---|---|
| Hex Head Nuts & Heavy Hex Nuts | DIN 934, ISO 4032, ASME B18.2.2 | Flange connections, structural bolting, and general piping assemblies |
| Square Nuts | DIN 557, DIN 562, ASME B18.2.2 | Electrical channels, machinery mounting, and architectural metalwork |
| Nylon Insert & All-Metal Lock Nuts | DIN 985, DIN 982, DIN 980 | Vibration-resistant fastening in pumps, motors, and rotating machinery |
| Eye Nuts | DIN 582, ASME B18.15 | Rigging, vertical lifting, cable anchoring, and marine suspension |
| Wing Nuts | DIN 315, ASME B18.6.X | Hand-tightened access panels, inspection covers, and quick-release fixtures |
| T-Slot & T-Nuts | DIN 508, ISO 299 | Machine tooling beds, aluminium extrusion profiles, and clamping assemblies |
| Panel & Thin Jam Nuts | DIN 439, ISO 4035 | Low-clearance locking, switchgear instrumentation, and panel mounting |
| Coupling / Extension Nuts | DIN 6334 | Joining threaded rods, strut hanger systems, and tie-rod extensions |
| Dome / Acorn Cap Nuts | DIN 1587 | Thread protection, sanitary equipment finishing, and aesthetic caps |
Key Advantages of UNS S30400 / S30403 Series Nuts
Reliable Corrosion Protection
Shields against atmospheric moisture, general industrial chemicals, and organic media with an unyielding passive chromium-oxide surface film.
Weld-Zone Stability (304L)
Low-carbon chemistry (0.03% max) eliminates chromium carbide precipitation, safeguarding welded structural joints from intergranular attack.
Elevated Creep Resistance (304H)
High-carbon design preserves thread clamping load, tensile properties, and structural integrity under prolonged thermal service up to 800°C.
High Torque Resistance
Precision-formed internal threads prevent stripping, galling, and pitch distortion even under rigorous, repeated pneumatic torque tightening.
Cost-Effective Sourcing
Provides a budget-optimized fastening solution for non-marine engineering projects without paying for unnecessary molybdenum additions.
Key Applications of SS UNS S30400 Series Nuts
Our stainless steel 304 nuts are deployed globally in severe industrial process lines, high-cleanliness manufacturing equipment, and heavy infrastructure projects.
| Industry | Typical Applications |
|---|---|
| Food Processing & Beverage | Processing machinery, mixing tanks, storage hoppers, and bottling lines |
| Pharmaceutical Processing | Cleanroom equipment, reactors, fluid piping systems, and pressure vessels |
| Chemical Processing | Storage tanks, heat exchangers, pumps, and general process piping |
| Water Treatment | Filtration infrastructure, pumping stations, and distribution manifolds |
| Construction & Fabrication | Structural steel framing, architectural facades, and heavy equipment mounts |
| Power Generation | Steam piping, condenser units, structural supports, and ducting systems |
SS 304 Nuts vs SS 316 Nuts
When selecting the ideal stainless fastener grade for your assembly, understanding the material and cost differentials between SS 304 and SS 316 is crucial.
| Comparison Factor | SS 304 / 304L / 304H Nuts | SS 316 / 316L / 316Ti Nuts |
|---|---|---|
| Alloy Composition | 18% Cr, 8% Ni (No Molybdenum) | 16% Cr, 10% Ni, 2–3% Molybdenum |
| Pitting Resistance | Moderate (Suitable for freshwater/mild chemicals) | High (Resists chlorides and marine environments) |
| Temperature Range | Up to 800°C (304H) | Up to 870°C |
| Cost | Cost-effective standard stainless grade | Higher cost due to Molybdenum addition |
| Best Suitable For | General industrial, food, and structural uses | Marine, offshore, acidic, and high-chloride uses |
| Detailed Specifications | Current Page | View SS 316 Nuts Specs → |
Quality Testing & Inspection
Aurum Overseas maintains a rigorous quality assurance process to guarantee that all fasteners meet global engineering specifications and client project requirements.
| Inspection / Test Type | Parameter Checked |
|---|---|
| Positive Material Identification (PMI) | Alloy composition verification via portable XRF spectrum analysis |
| Dimensional & Thread Inspection | Pitch diameter, thread angle, width across flats, and tolerances per ASME B18.2.2 / DIN 934 |
| Mechanical Testing | Tensile strength, yield strength, and elongation verification on test coupons |
| Proof Load & Hardness Testing | Proof load strength verification and Rockwell B / Brinell hardness testing |
| Visual & Surface Inspection | 100% inspection for surface flaws, burrs, micro-cracks, and thread pitch defects |
| Material Test Certification | EN 10204 3.1 MTC issued with complete melt heat number traceability |
Global Export Markets
Aurum Overseas exports certified SS 304 / 304L / 304H Nuts to major industrial markets worldwide with complete inspection reports, export documentation, and quality certifications.
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
SS 304 is the standard industrial grade; SS 304L features lower carbon (0.03% max) to prevent intergranular corrosion after welding; SS 304H contains higher carbon (0.04%–0.10%) to provide superior creep strength at high temperatures.
SS 304 nuts are suitable for freshwater and mild atmospheric exposure. For direct marine, saltwater, or high-chloride environments, SS 316 nuts are recommended due to their molybdenum content.
Our SS 304 series nuts are manufactured to ASTM A194 Grade 8/8A, ASME B18.2.2, DIN 934, and ISO 4032 standards, covering property classes A2-50, A2-70, and A2-80.
Yes, Aurum Overseas manufactures custom metric and imperial nuts, extra-heavy hex configurations, fine pitch threads, and custom height variants based on client engineering drawings.
Yes, Aurum Overseas regularly exports certified SS 304 fasteners to major energy hubs across the USA, European markets (Germany, UK, France, Netherlands), and Gulf GCC nations (UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain).
Contact Aurum Overseas
Aurum Overseas is ready to support your immediate inventory or project-based fastener requirements. We supply standard stock, specialized dimensions, and project-specific heat-treated lots with full documentation and global export packaging.
Contact our sales team today to get a quote, get technical datasheets, or discuss your delivery schedule.