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Our Duplex2205 Hex Nut is engineered to seal high-performance bolts in harsh environments, crafted by HT&FST from Duplex2205 stainless steel (UNS S32205, ID F51, W.Nr 1.4462). It adheres to DIN934, ISO4032, and ASME B18.2.2 standards, covering sizes from M5 to M64 (non-standard via OEM).
Each nut meets Grade 80 strength requirements (tensile strength 620 N/mm², yield strength 450 N/mm²) and holds EN10204-3.1B certification. The bright & clean finish enhances durability, while its dual-phase (austenitic-ferritic) microstructure balances strength and ductility—preventing stripping under high torque.
High Strength: 620 N/mm² tensile strength and 450 N/mm² yield strength exceed standard 316 stainless steel (205 N/mm² yield).
Dual-Phase Microstructure: Combines austenite’s ductility with ferrite’s strength, resisting deformation under thermal cycling.
Brinell Hardness ≤290 HB: Ensures compatibility with high-torque installation without cracking.
Key Composition: 21–23% chromium (oxidation resistance), 4.5–6.5% nickel (ductility), 2.5–3.5% molybdenum (chloride resistance), 0.08–0.2% nitrogen (pitting resistance).
Resists Common Media: Withstands saltwater, mild acids (acetic acid), and chlorinated water—ideal for desalination plants.
Stress Corrosion Cracking (SCC) Resistance: Outperforms austenitic stainless steels in chloride-rich environments.
Custom Threads: Available in metric, imperial, or non-standard pitches (e.g., fine threads for precision equipment).
Packaging Options: Standard bulk packaging; anti-rust coating for long-term storage.
Sample Testing: Free samples to verify thread fit with your bolts.
Duplex2205 Hex Nut
Name | Hex Nut |
Standard | DIN934,ISO4032,ASME B18.2.2 |
Size Range | M5-M64 or non-standard as requested |
Finish | Bright&Clean |
Marking | HT&FST or customization |
Material | Duplex2205,UNS S32205,F51,1.4462 |
Grade | Grade 80 |
Certificates | EN10204-3.1B |
Non-standards | OEM is available, according to drawing or samples |
Samples | Samples available |
| Package | Bulk in box and then in cartons, then on pallets, or according to customers' requirement. |
| Payment | T/T,Western Union |
Similar brand
UNS | ID | JIS | W.Nr |
| S31803 | F51 | SUS32953L | 1.4462 |
Chemical composition of duplex stainless steel F51 (S31803/2205/1.4462) nut
| Alloy | % | Ni | Cr | Fe | Mo | N | C | Mn | Si | S | P |
| 2205 | Min. | 4.5 | 21 | Bal | 2.5 | 0.08 | |||||
| Max. | 6.5 | 23 | 3.5 | 0.2 | 0.03 | 2 | 1 | 0.02 | 0.03 |
Minimum mechanical properties of duplex stainless steel F51 (S31803/2205/1.4462) nut alloy at room temperature
| Tensile strength Rm N/mm2 | Yield strength RP0.2 N/mm2 | Elongation rate A5% | Brinell hardness HB |
| 620 | 450 | 25 | 290 |
Oil & Gas Pipeline Sealing: Duplex2205 DIN934 Hex Nut (620 N/mm² tensile strength) secures offshore platform pipelines and drilling equipment. Its 21–23% chromium and 2.5–3.5% molybdenum resist saltwater and hydrocarbons, preventing thread stripping under high torque.
Desalination Plants: Resists brine and chlorinated water, making it ideal for fastening reverse osmosis system components. Its dual-phase (austenitic-ferritic) structure balances strength and ductility, avoiding deformation in thermal cycling.
Chemical Tank Connections: Seals mild acid tanks (e.g., acetic acid) and processing equipment. It outperforms 316 stainless steel in chloride-rich environments, preventing stress corrosion cracking (SCC) in long-term use.
Power Plant Boiler Lines: Withstands high temperature/pressure in thermal power plants. Used to secure boiler pipes and secondary coolant loop components, ensuring tight sealing and resistance to heat-induced wear.
A1: Duplex2205 offers 2–3x higher yield strength and superior chloride resistance. 316 works for mild environments; Duplex2205 is better for high-pressure/corrosive settings.
A2: Torque depends on size (e.g., M12 = 80 N·m dry, 60 N·m lubricated). We provide a detailed torque chart to prevent over-tightening.
A3: Avoid galvanic corrosion by pairing with Duplex2205 or alloy bolts. If using carbon steel, apply zinc chromate coating to the thread interface.
A4: 2–4 weeks for non-standard sizes. Rush orders (1 week) are available for an additional 20% fee.
Our Duplex2205 Hex Nut is engineered to seal high-performance bolts in harsh environments, crafted by HT&FST from Duplex2205 stainless steel (UNS S32205, ID F51, W.Nr 1.4462). It adheres to DIN934, ISO4032, and ASME B18.2.2 standards, covering sizes from M5 to M64 (non-standard via OEM).
Each nut meets Grade 80 strength requirements (tensile strength 620 N/mm², yield strength 450 N/mm²) and holds EN10204-3.1B certification. The bright & clean finish enhances durability, while its dual-phase (austenitic-ferritic) microstructure balances strength and ductility—preventing stripping under high torque.
High Strength: 620 N/mm² tensile strength and 450 N/mm² yield strength exceed standard 316 stainless steel (205 N/mm² yield).
Dual-Phase Microstructure: Combines austenite’s ductility with ferrite’s strength, resisting deformation under thermal cycling.
Brinell Hardness ≤290 HB: Ensures compatibility with high-torque installation without cracking.
Key Composition: 21–23% chromium (oxidation resistance), 4.5–6.5% nickel (ductility), 2.5–3.5% molybdenum (chloride resistance), 0.08–0.2% nitrogen (pitting resistance).
Resists Common Media: Withstands saltwater, mild acids (acetic acid), and chlorinated water—ideal for desalination plants.
Stress Corrosion Cracking (SCC) Resistance: Outperforms austenitic stainless steels in chloride-rich environments.
Custom Threads: Available in metric, imperial, or non-standard pitches (e.g., fine threads for precision equipment).
Packaging Options: Standard bulk packaging; anti-rust coating for long-term storage.
Sample Testing: Free samples to verify thread fit with your bolts.
Duplex2205 Hex Nut
Name | Hex Nut |
Standard | DIN934,ISO4032,ASME B18.2.2 |
Size Range | M5-M64 or non-standard as requested |
Finish | Bright&Clean |
Marking | HT&FST or customization |
Material | Duplex2205,UNS S32205,F51,1.4462 |
Grade | Grade 80 |
Certificates | EN10204-3.1B |
Non-standards | OEM is available, according to drawing or samples |
Samples | Samples available |
| Package | Bulk in box and then in cartons, then on pallets, or according to customers' requirement. |
| Payment | T/T,Western Union |
Similar brand
UNS | ID | JIS | W.Nr |
| S31803 | F51 | SUS32953L | 1.4462 |
Chemical composition of duplex stainless steel F51 (S31803/2205/1.4462) nut
| Alloy | % | Ni | Cr | Fe | Mo | N | C | Mn | Si | S | P |
| 2205 | Min. | 4.5 | 21 | Bal | 2.5 | 0.08 | |||||
| Max. | 6.5 | 23 | 3.5 | 0.2 | 0.03 | 2 | 1 | 0.02 | 0.03 |
Minimum mechanical properties of duplex stainless steel F51 (S31803/2205/1.4462) nut alloy at room temperature
| Tensile strength Rm N/mm2 | Yield strength RP0.2 N/mm2 | Elongation rate A5% | Brinell hardness HB |
| 620 | 450 | 25 | 290 |
Oil & Gas Pipeline Sealing: Duplex2205 DIN934 Hex Nut (620 N/mm² tensile strength) secures offshore platform pipelines and drilling equipment. Its 21–23% chromium and 2.5–3.5% molybdenum resist saltwater and hydrocarbons, preventing thread stripping under high torque.
Desalination Plants: Resists brine and chlorinated water, making it ideal for fastening reverse osmosis system components. Its dual-phase (austenitic-ferritic) structure balances strength and ductility, avoiding deformation in thermal cycling.
Chemical Tank Connections: Seals mild acid tanks (e.g., acetic acid) and processing equipment. It outperforms 316 stainless steel in chloride-rich environments, preventing stress corrosion cracking (SCC) in long-term use.
Power Plant Boiler Lines: Withstands high temperature/pressure in thermal power plants. Used to secure boiler pipes and secondary coolant loop components, ensuring tight sealing and resistance to heat-induced wear.
A1: Duplex2205 offers 2–3x higher yield strength and superior chloride resistance. 316 works for mild environments; Duplex2205 is better for high-pressure/corrosive settings.
A2: Torque depends on size (e.g., M12 = 80 N·m dry, 60 N·m lubricated). We provide a detailed torque chart to prevent over-tightening.
A3: Avoid galvanic corrosion by pairing with Duplex2205 or alloy bolts. If using carbon steel, apply zinc chromate coating to the thread interface.
A4: 2–4 weeks for non-standard sizes. Rush orders (1 week) are available for an additional 20% fee.
