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Incoloy 925 Nuts are high-performance, precipitation-hardened fasteners engineered for severe corrosive and high-stress environments. Manufactured from UNS N09925 nickel-iron-chromium alloy with molybdenum, copper, and titanium additions, these nuts deliver exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking. They are widely used in oil & gas extraction systems, offshore marine structures, and chemical processing equipment where conventional stainless steel fasteners fail under aggressive conditions.
Designed in compliance with ASTM F467 and applicable DIN/ISO standards, Incoloy 925 Nuts provide stable mechanical performance even in sour gas (H₂S) environments and elevated temperatures. Their combination of high tensile strength and corrosion resistance makes them a preferred choice for critical bolting applications in subsea assemblies, downhole equipment, and high-pressure pipelines.
KK Fasteners supplies these nuts to global EPC contractors and industrial OEMs with full material traceability and certified quality documentation, ensuring consistent performance across demanding engineering applications.
| Parameter | Specification |
|---|---|
| Material | Incoloy 925 (UNS N09925) – Nickel-Iron-Chromium Alloy with Mo, Cu, Ti |
| Applicable Standards | ASTM F467, ASTM B805, DIN 934, ISO 4032, NACE MR0175 |
| Nut Types | Hex Nut, Heavy Hex Nut, Jam Nut, Lock Nut, Custom Machined Nut |
| Size Range | M6 to M100 | 1/4” to 4” |
| Thread Types | Metric (M), UNC, UNF, BSW (on request) |
| Tensile Strength | Approx. 950 – 1200 MPa (age-hardened condition) |
| Yield Strength | Approx. 600 – 900 MPa (depending on heat treatment) |
| Hardness | 28 – 35 HRC (precipitation hardened condition) |
| Surface Finish | Natural, Passivated, Anti-galling Coating, PTFE Coated (optional) |
| Temperature Range | -100°C to +300°C (service dependent) |
| Corrosion Resistance | Excellent resistance to seawater, H₂S, chlorides, and acidic environments |
| Testing & Inspection | Dimensional Inspection, Hardness Test, Tensile Test, PMI Testing, TPI (on request) |
| Grade | C | Mo | Si | S | Cu | Fe | Ni | Cr | Al | Ti |
| Incoloy 925 | 0.01 max | 3 max | 0.5 max | 0.03 max | 1.8 | 28 | 44 | 21 | 0.3 | 2.1 |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.05 g/cm³ | 1343 °C (2450 °F) | Psi – 175000 , MPa – 1210 | Psi – 117000 , MPa – 810 | 24 % |
| STANDARD | WERKSTOFF NR. | UNS |
| Incoloy 925 | – | N09925 |
Nominal or Basic Major Diameter of Nut Thread |
Incoloy Nuts Width Across Flats (F) |
Width Across Corners (G) | Thickness of Alloy 825 Hex Nuts (H) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Basic | Max | Min | Max | Min | Basic | Max | Min | ||
| 1/4 | 0.2500 | 7/16 | .438 | .428 | .505 | .488 | 7/32 | 0.226 | 0.212 |
| 5/16 | 0.3125 | 1/2 | .500 | .489 | .577 | .557 | 17/64 | 0.273 | 0.258 |
| 3/8 | 0.3750 | 9/16 | .562 | .551 | .650 | .628 | 21/64 | 0.337 | 0.320 |
| 7/16 | 0.4375 | 11/16 | .688 | .675 | .794 | .768 | 3/8 | 0.385 | 0.365 |
| 1/2 | 0.5000 | 3/4 | .750 | .736 | .866 | .840 | 7/16 | 0.448 | 0.427 |
| 9/16 | 0.5625 | 7/8 | .875 | .861 | 1.010 | .982 | 31/64 | 0.496 | 0.473 |
| 5/8 | 0.6250 | 15/16 | .938 | .922 | 1.083 | 1.051 | 35/64 | 0.559 | 0.535 |
| 3/4 | 0.7500 | 1-1/8 | 1.125 | 1.088 | 1.299 | 1.240 | 41/64 | 0.665 | 0.617 |
| 7/8 | 0.8750 | 1-5/16 | 1.312 | 1.269 | 1.516 | 1.447 | 3/4 | 0.776 | 0.724 |
| 1 | 1.0000 | 1-1/2 | 1.500 | 1.450 | 1.732 | 1.653 | 55/64 | 0.887 | 0.831 |
| 1-1/8 | 1.1250 | 1-11/16 | 1.688 | 1.631 | 1.949 | 1.859 | 31/32 | 0.999 | 0.939 |
| 1-1/4 | 1.2500 | 1-7/8 | 1.875 | 1.812 | 2.165 | 2.066 | 1-1/16 | 1.094 | 1.030 |
| 1-3/8 | 1.3750 | 2-1/16 | 2.062 | 1.994 | 2.382 | 2.273 | 1-11/64 | 1.206 | 1.138 |
| 1-1/2 | 1.5000 | 2-1/4 | 2.250 | 2.175 | 2.598 | 2.480 | 1-9/32 | 1.317 | 1.245 |
| 1-5/8 | 1.6250 | 2-7/16 | 2.438 | 2.356 | 2.815 | 2.686 | 1-25/64 | 1.429 | 1.353 |
| 1-3/4 | 1.7500 | 2-5/8 | 2.625 | 2.538 | 3.031 | 2.893 | 1-1/2 | 1.540 | 1.460 |
| 2 | 2.000 | 3 | 3.000 | 2.900 | 3.464 | 3.306 | 1-23/32 | 1.763 | 1.675 |
| 2-1/4 | 2.2500 | 3-3/8 | 3.375 | 3.263 | 3.897 | 3.719 | 1-15/16 | 1.986 | 1.890 |
| 2-1/2 | 2.5000 | 3-3/4 | 3.750 | 3.625 | 4.330 | 4.133 | 2-5/32 | 2.209 | 2.105 |
| 2-3/4 | 2.7500 | 4-1/8 | 4.125 | 3.988 | 4.763 | 4.456 | 2-3/8 | 2.431 | 2.319 |
| 3 | 3.000 | 4-1/2 | 4.500 | 4.350 | 5.196 | 4.959 | 2-19/32 | 2.654 | 2.534 |
Incoloy 925 Nuts are used in critical engineering environments where corrosion resistance and mechanical reliability are essential under extreme conditions.
The manufacturing of Incoloy 925 Nuts involves precision hot forging followed by CNC machining to achieve tight dimensional tolerances. Controlled heat treatment is applied to achieve precipitation hardening, ensuring consistent mechanical strength across batches.
Each lot undergoes rigorous inspection including dimensional verification, hardness testing, and tensile strength validation. Surface finish checks ensure anti-galling performance in high-torque assemblies. Full material traceability is maintained through heat numbers and batch documentation.
KK Fasteners follows ISO 9001:2015 certified quality systems, with optional third-party inspection (TPI) for global EPC and offshore projects. Compliance with ASTM F467 and NACE MR0175 ensures suitability for critical industrial environments.
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Incoloy 925 Nuts are high-strength nickel alloy fasteners made from UNS N09925. They are precipitation-hardened and designed for severe corrosive environments such as offshore oil & gas, marine systems, and chemical processing units where resistance to pitting, cracking, and sour gas is essential.
Incoloy 925 offers a unique combination of high tensile strength and excellent corrosion resistance due to its nickel, chromium, molybdenum, copper, and titanium composition. This makes it ideal for applications involving H₂S exposure, chlorides, and high mechanical stress.
These nuts are typically manufactured in compliance with ASTM F467 and ASTM B805. They also meet international fastening standards such as DIN 934, ISO 4032, and NACE MR0175 for sour service environments in oil and gas applications.
They are widely used in offshore drilling rigs, subsea equipment, chemical processing plants, marine engineering systems, and high-pressure pipeline assemblies. Their corrosion resistance makes them suitable for environments where standard stainless steel fasteners fail.
Look for suppliers that provide full material traceability, certified test reports, compliance with ASTM/NACE standards, and proven export experience. A reliable manufacturer like KK Fasteners ensures consistent quality, inspection reports, and global supply capability.
Incoloy 925 Nuts are engineered for environments where failure is not an option, combining high strength with exceptional corrosion resistance for critical industrial systems. With certified manufacturing control and global export capability, KK Fasteners supports engineering projects that demand reliability under extreme conditions.
For technical specifications, custom dimensions, or RFQ support, contact KK Fasteners to receive detailed engineering assistance and a tailored quotation.
