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Inconel 625 nuts are engineered fastening components made from a nickel-chromium-molybdenum alloy designed to perform under extreme heat, pressure, and corrosive conditions. These nuts are widely used in industries such as aerospace, marine engineering, chemical processing, and oil & gas, where conventional stainless steel fasteners fail to maintain structural integrity. Manufactured in accordance with standards like ASTM B446, DIN, and ISO specifications, they deliver consistent mechanical strength and exceptional resistance to oxidation and pitting corrosion.
The primary advantage of Inconel 625 Nuts lies in their ability to retain tensile strength at temperatures exceeding 980°C while resisting aggressive media such as chlorides, acids, and seawater. KK Fasteners supplies these nuts with full material traceability and supports global industrial requirements through precision manufacturing and export-ready packaging.
| Parameter | Specification |
|---|---|
| Material | Inconel 625 (Nickel-Chromium-Molybdenum Alloy) |
| Grade | UNS N06625 / W.Nr 2.4856 |
| Size Range | M3 to M64 / 1/8" to 2" |
| Thread Type | Metric, UNC, UNF, BSW |
| Standards | ASTM B446, DIN 934, ISO 4032, ASME B18.2.2 |
| Types | Hex Nuts, Heavy Hex Nuts, Lock Nuts, Jam Nuts |
| Surface Finish | Plain, Passivated, PTFE Coated |
| Tensile Strength | ≥ 827 MPa |
| Hardness | Max 35 HRC |
| Grade | C | Mn | Si | Fe | S | Cr2 | Al-Ti | Ni | |
| 625 | min. | – | – | – | – | – | 20.0 | – | 58.0 |
| max. | 0.10 | 0.50 | 0.50 | 5.0 | 0.015 | 23.0 | 0.40 | – | |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 625 | Psi – 1,35,000 , MPa -930 | Psi – 75,000 , MPa – 517 | 42.5 | – | – |
| Grade | UNS No | Old British | Euronorm | GOST | Japanese JIS | ||
| BS | En | No | AFNOR | ||||
| Inconel 625 | N06625 | NA 21 | NiCr22Mo9Nb | 2.4856 | NC22DNB4M | ХН75МБТЮ | NCF 625 |
| Size | Finished Hex | Heavy Hex | Finished Jam | Heavy Hex Jam | Square | Heavy Square |
| 1/2″ Nut | 3.75 | 6.54 | 2.62 | 4.00 | 5.78 | 7.87 |
| 5/8″ Nut | 7.33 | 11.9 | 4.93 | 6.96 | 10.8 | 14.3 |
| 3/4″ Nut | 11.9 | 19.3 | 7.70 | 11.0 | 15.4 | 23.5 |
| 7/8″ Nut | 19.0 | 29.7 | 12.0 | 16.7 | 24.5 | 36.2 |
| 1″ Nut | 28.3 | 42.5 | 17.6 | 23.5 | 36.3 | 51.5 |
| 11/8″ Nut | 40.3 | 59.2 | 24.7 | 32.4 | 52.5 | 72.4 |
| 11/4″ Nut | 54.3 | 78.6 | 36.1 | 45.8 | 70.6 | 95.5 |
| 13/8″ Nut | 73.0 | 102 | 47.9 | 59.3 | 94.5 | 125.0 |
| 11/2″ Nut | 94.3 | 131 | 60.9 | 74.8 | 122 | 161 |
| 15/8″ Nut | 162 | 91.6 | ||||
| 13/4″ Nut | 151 | 204 | 100 | 114 | ||
| 17/8″ Nut | 241 | 134 | ||||
| 2″ Nut | 224 | 299 | 140 | 165 | ||
| 21/4″ Nut | 419 | 227 | ||||
| 21/2″ Nut | 564 | 332 | ||||
| 23/4″ Nut | 738 | 429 | ||||
| 3″ Nut | 950 | 545 | ||||
| 31/4″ Nut | 1194 | 651 | ||||
| 31/2″ Nut | 1526 | 851 | ||||
| 33/4″ Nut | 1812 | 1005 | ||||
| 4″ Nut | 2180 | 1200 |
Inconel 625 nuts are used in environments requiring high strength, corrosion resistance, and thermal stability.
Inconel 625 nuts are typically produced using hot forging followed by CNC machining to achieve precise dimensions and thread accuracy. This process ensures uniform grain structure and mechanical strength across batches. Post-machining treatments such as solution annealing and passivation enhance corrosion resistance and surface integrity.
Quality control includes dimensional inspection using calibrated gauges, hardness testing, and tensile verification in compliance with ASTM standards. Each batch is traceable through heat numbers and inspection reports. KK Fasteners follows ISO 9001-certified processes, ensuring consistency across domestic and export shipments while meeting stringent industrial requirements.
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Inconel 625 nuts are high-performance fastening components made from a nickel-chromium-molybdenum alloy. They are designed to provide exceptional strength, corrosion resistance, and thermal stability, making them suitable for demanding environments such as aerospace, marine, and chemical processing industries.
Yes, Inconel 625 nuts offer excellent resistance to corrosion, including pitting, crevice corrosion, and chloride stress corrosion cracking. This makes them ideal for use in seawater environments, chemical plants, and offshore applications where standard materials may fail.
Inconel 625 nuts are typically manufactured in accordance with international standards such as ASTM B446, DIN 934, ISO 4032, and ASME B18.2.2. These standards ensure consistency in material composition, dimensions, and mechanical performance.
Choosing the right Inconel 625 nut depends on factors such as operating temperature, load requirements, and environmental exposure. For high-temperature or highly corrosive environments, this alloy provides better durability and performance compared to conventional stainless steel fasteners.
A reliable supplier should offer ISO-certified manufacturing, complete material traceability, and compliance with ASTM and DIN standards. It is also important to evaluate their export experience, quality documentation, and ability to meet delivery timelines. KK Fasteners supplies globally with consistent quality assurance practices.
For applications where failure is not an option, selecting the right fastener material is critical. Inconel 625 nuts provide the reliability required in extreme operating conditions, backed by precise manufacturing and strict quality control. KK Fasteners supports global industries with consistent supply and detailed inspection documentation. Request a quote or connect with the engineering team to discuss your specific requirements.
