Table of Contents
- SS 310/310S/310H Nuts Overview
- SS 310/310S/310H Nuts Specifications
- What are Stainless Steel 310/310S/310H Nuts?
- SS 310 / 310S / 310H Technical Properties & Composition
- Why Industries Prefer SS 310 Series Nuts
- Types of SS 310 Series Nuts
- Key Advantages of UNS S31000 / S31008 Series Nuts
- Key Applications of SS UNS S31000 Series Nuts
- SS 310 Nuts vs SS 316 Nuts
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
SS 310 / 310S / 310H Nuts Suppliers & Exporters
Aurum Overseas is a premier global SS 310/310S/310H Nuts Supplier and stocking SS 310/310S/310H Nuts Exporter. Engineered specifically for ultra-high temperature service up to 1150°C (2100°F), our high-chromium, high-nickel austenitic stainless steel nuts deliver exceptional resistance to thermal fatigue, cyclic oxidation, and high-temperature carburization.
Manufactured in strict accordance with ASTM A194 Grade 10 standards and dual-certified ASME dimensional specifications, these industrial fasteners ensure structural clamping integrity in intense thermal processing environments. We supply complete imperial and metric size ranges to critical processing facilities throughout the USA, Canada, Europe, Germany, the UK, and the GCC region (UAE, Saudi Arabia, Qatar, Kuwait, Oman, Bahrain).
SS 310/310S/310H Nuts Specifications
| Parameter | Specification / Technical Range |
|---|---|
| Material Grades | SS 310, SS 310S, SS 310H |
| UNS Numbers | UNS S31000 / S31008 / S31009 Nuts |
| Werkstoff Numbers | 1.4841 (310), 1.4845 (310S), 1.4845 High-C (310H) |
| Manufacturing Standards | ASTM A194 Gr 310 Nuts, ASTM F593, ASME SF593, ASME B18.2.2, DIN 934, ISO 4032 |
| Size Range | M3 to M56 (Metric) | 3/8" to 2" (Imperial) | Custom heavy-duty sizes up to 4" |
| Thread Configuration | ASME B1.1 2A/3A - 2B/3B Unified (UNC, UNF, UNEF) & B1.13M 6h-6G Metric Coarse/Fine |
| Special Fastener Formats | SS 310 Heavy Hex Head Nuts, SS 310 Square Nuts, SS 310 T Nuts, SS 310 Eye Nuts |
| Surface Finishes | Bright Polished, Passivated, Solution Annealed, Anti-Galling Coated, Bare Machined |
| Certifications | EN 10204 3.1 Manufacturer Test Certificate, NACE MR0175, Dual Certified ASTM/ASME |
What are Stainless Steel 310/310S/310H Nuts?
Stainless Steel 310-grade nuts are high-temperature 25% Chromium / 20% Nickel austenitic fasteners formulated for high creep strength and elevated-temperature oxidation protection.
- SS 310 (UNS S31000 / 1.4841): Standard high-chromium alloy optimized for continuous high-temperature service with strong resistance to thermal spalling.
- SS 310S (UNS S31008 / 1.4845): Low-carbon variant (0.08% max C) engineered to prevent intergranular carbide precipitation during welding in thermal fabrications.
- SS 310H (UNS S31009): High-carbon modification (0.04%–0.10% C) specifically designated for long-term creep-rupture strength in elevated-temperature structural joints above 650°C.
SS 310 / 310S / 310H Technical Properties & Composition
The chemical composition and mechanical properties of the 310 series are calibrated to achieve the optimum balance between high-temperature oxidation resistance, creep strength, thread integrity, and structural clamping capabilities.
Chemical Composition of UNS S31000 / S31008 / S31009 Nuts (%)
| Element | SS 310 | SS 310S | SS 310H |
|---|---|---|---|
| Carbon (C) | 0.015 max | 0.08 max | 0.04 – 0.10 |
| Manganese (Mn) | 2.0 max | 2.0 max | 2.0 max |
| Silicon (Si) | 0.15 max | 1.00 max | 1.00 max |
| Phosphorus (P) | 0.020 max | 0.045 max | 0.045 max |
| Sulfur (S) | 0.015 max | 0.030 max | 0.030 max |
| Chromium (Cr) | 24.00 – 26.00 | 24.00 – 26.00 | 24.00 – 26.00 |
| Molybdenum (Mo) | 0.10 max | 0.75 max | — |
| Nickel (Ni) | 19.00 – 21.00 | 19.00 – 21.00 | 19.00 – 21.00 |
| Nitrogen (N) | 54.7 min | 53.095 min | 53.885 min |
Mechanical Properties of UNS S31000 / S31008 / S31009 Nuts
| Technical Parameter | Metric / Imperial Value |
|---|---|
| Density | 7.9 g/cm³ |
| Melting Point | 1402 °C (2555 °F) |
| Tensile Strength | 515 MPa / 75,000 Psi min |
| Yield Strength (0.2% Offset) | 205 MPa / 30,000 Psi min |
| Elongation in 50mm | 40 % |
Equivalent Grades of SS 310 / 310S / 310H Nuts
| Grade | UNS | W.Nr. | JIS | EN |
|---|---|---|---|---|
| SS 310 | S31000 | 1.4841 | SUS 310 | X15CrNi25-20 |
| SS 310S | S31008 | 1.4845 | SUS 310S | X8CrNi25-21 |
| SS 310H | S31009 | — | — | — |
Why Industries Prefer SS 310 Series Nuts
High-temperature process industries rely on 310-grade bolting due to its dense, adherent surface chromium-oxide scale that forms when exposed to elevated temperatures. Unlike standard 304 or 316 grades that suffer severe scaling and mechanical failure above 800°C, SS 310 retains dimensional stability and thread engagement during continuous duty up to 1150°C.
Furthermore, the substantial 19–21% nickel concentration stabilizes the austenitic structure against embrittlement in reducing, carburizing, and nitriding furnace atmospheres. Operating as a dependable SS 310/310S/310H Nuts Exporter, Aurum Overseas supplies precision-threaded hardware that avoids stress relaxation and thermal seizure under extreme heat cycles.
Types of SS 310 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 310 Hex Head Nuts
SS 310 Square Nuts
SS 310 Lock Nuts
SS 310 Eye Nuts
SS 310 Wing Nuts
SS 310 T Nuts
SS 310 Panel Nuts
SS 310 Coupling Nuts
SS 310 Dome Nuts
Key Advantages of UNS S31000 / S31008 Series Nuts
Extreme Thermal Resistance
Resists continuous high-temperature oxidation up to 1150°C and intermittent thermal shocks up to 1035°C.
Carburization & Sulfidation Protection
Dense nickel-chromium layer prevents carbon ingress and hot-gas corrosion in heat treating equipment.
Weld Integrity (310S Variant)
Low carbon chemistry restricts chromium carbide precipitation during hot-joining, preserving joint ductility.
Creep Rupture Strength (310H Variant)
Higher carbon content delivers long-term resistance to plastic deformation under continuous load at high heat.
Anti-Galling Reliability
Precision thread pitch manufacturing per ASME B1.1 prevents thread seizure under severe expansion-contraction stresses.
Key Applications of SS UNS S31000 Series Nuts
Our stainless steel 310 nuts are deployed globally in extreme high-temperature process industries, thermal treatment equipment, and critical power generation infrastructure.
| Industry Sector | Primary Fastener Application |
|---|---|
| Thermal Processing & Kilns | Retorts, muffle furnaces, burner nozzles, and conveyor belt mountings |
| Petrochemical Refining | Fluid catalytic cracking units (FCCU), flare stacks, and tube hangers |
| Power Generation | Coal gasifier components, steam superheaters, and boiler baffle supports |
| Ore & Cement Processing | Smelting equipment, rotary kiln feed pipes, and calciner vessel bolting |
| Cryogenic & High-Heat Piping | Dual-temperature fluid lines requiring low magnetic permeability and toughness |
SS 310 Nuts vs SS 316 Nuts
When selecting the ideal stainless fastener grade for your assembly, understanding the material and performance differentials between SS 310 and standard industrial grades is crucial.
| Comparison Factor | SS 310 / 310S / 310H Nuts | SS 304 / SS 316 Nuts |
|---|---|---|
| Maximum Operating Temp | Up to 1150°C (2100°F) | 800°C (304) / 870°C (316) |
| Alloy Matrix | 25% Cr, 20% Ni (High-Temp Grade) | 18% Cr, 8% Ni (304) / 16% Cr, 10% Ni, 2% Mo (316) |
| Primary Failure Resistance | Thermal scaling, carburization, creep | Atmospheric rust (304), chloride pitting (316) |
| Cost Profile | Specialized high-alloy investment grade | Economical standard industrial grades |
| Core Application Focus | Furnaces, kilns, heat exchangers, boilers | Ambient structural, food processing, marine piping |
| Detailed Specifications | Current Page | View SS 316 Nuts Specs → |
Quality Testing & Inspection
Aurum Overseas maintains strict quality control measures to certify that all hardware shipped by our team operating as an SS 310/310S/310H Nuts Supplier meets international engineering criteria.
| Test / Inspection Standard | Technical Verification Scope |
|---|---|
| Positive Material Identification (PMI) | XRF spectroscopic verification of 25% Cr / 20% Ni alloy chemistry |
| Dimensional & Thread Tolerances | Pitch, depth, and concentricity checks via calibrated gauges per ASME B18.2.2 / DIN 934 |
| Mechanical & Proof Load Testing | Verification of yield strength, tensile performance, and proof load capabilities |
| Intergranular Corrosion (IGC) | Microstructural examination verifying freedom from grain-boundary carbide networks |
| Traceable MTC Documentation | EN 10204 3.1 Material Test Certificate issued with heat numbers for total traceability |
Global Export Markets
Aurum Overseas supplies certified high-temperature bolting products with export-grade ocean packaging, full heat-trace documentation, and comprehensive mill certifications worldwide.
USA
Canada
Mexico
Germany
United Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
SS 310 is the base grade for continuous high-heat duty. SS 310S features lower carbon (0.08% max) to eliminate carbide precipitation during welding, while SS 310H contains controlled higher carbon (0.04%–0.10%) to optimize creep strength above 650°C.
While SS 310 offers good general corrosion resistance, its chemical design targets elevated-temperature oxidation. For ambient marine or wet chloride immersion, molybdenum-bearing grades like SS 316 or Duplex UNS S31803 are technically preferred.
Our high-temperature nuts conform to ASTM A194 Gr 310 Nuts specifications along with dimensional frameworks including ASME B18.2.2, DIN 934, and ISO 4032.
Yes, we supply a wide array of specialized configurations including SS 310 Heavy Hex Head Nuts, SS 310 Square Nuts, SS 310 T Nuts, and forged SS 310 Eye Nuts according to standard or custom drawings.
Yes, Aurum Overseas manufactures metric sizes from M3 to M56 and imperial diameters up to 4 inches with UNC, UNF, Metric Coarse, or custom fine pitches.
Yes, Aurum Overseas regularly exports certified SS 310 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.