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Our Duplex Washer is a premium sealing solution designed to pair with heavy-duty fasteners in harsh industrial settings, manufactured by HT&FST. It is available in three high-performance duplex stainless steel grades:
Duplex 2205 (UNS S31803, ID F51, JIS SUS32953L, W.Nr 1.4462)
Super Duplex 2507 (UNS S32750, ID F53, AISI/ASTM 2507, W.Nr 1.4410)
Super Duplex S32760 (UNS S32760, ID F55, W.Nr 1.4501)
Adhering to global standards (DIN125A/DIN9021/DIN434, ISO7089/ISO7093, ASME B 18.22.1), it covers sizes from M5 to M100, with non-standard options via OEM. Each washer holds EN10204-3.1B certification and features a bright & clean finish, ensuring durability and compatibility with diverse fasteners.
Name | Duplex washer |
Standard | DIN125A/DIN9021/DIN434,ISO7089/ISO7093,ASME B 18.22.1 |
Size Range | M5-M100 or non-standard as requested |
Finish | Bright&Clean |
Marking | HT&FST or customization |
Material | Duplex 2205 & Super duplex 2507 & S32760 |
Grade | Grade HV200 |
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 |
Duplex 2205: Tensile strength 620 N/mm², yield strength 450 N/mm², elongation rate 25%, Brinell hardness 290 HB—ideal for medium-pressure applications.
Super Duplex 2507: Tensile strength 800 N/mm², yield strength 550 N/mm², elongation rate 15%, Brinell hardness 310 HB—suited for high-stress, offshore environments.
Super Duplex S32760: Tensile strength 820 N/mm², yield strength 550 N/mm², elongation rate 25%—combines strength with ductility for extreme chemicals.
Duplex 2205: 21–23% chromium + 4.5–6.5% nickel + 2.5–3.5% molybdenum resists freshwater and mild chemicals.
Super Duplex 2507: 24–26% chromium + 6.0–8.0% nickel + nitrogen (0.24–0.32%) enhances saltwater and chloride resistance.
Super Duplex S32760: Adds copper (1.0%) and tungsten (1.0%) to 24–26% chromium, resisting sulfuric acid and stress corrosion cracking.
Marking Options: Standard HT&FST marking; custom logos/part numbers available for branding.
Packaging Flexibility: Standard bulk packaging (boxes → cartons → pallets); custom moisture-proof or tamper-evident packaging upon request.
Sample Support: Free samples to test compatibility with your bolts and validate performance.
Oil & Gas Offshore Operations: Super Duplex 2507/S32760 DIN125A Washers pair with heavy-duty fasteners in offshore platforms and subsea pipelines. They withstand high pressure and saltwater corrosion, ensuring leak-free sealing for deepwater drilling rigs.
Chemical Processing: Duplex 2205 variants resist mild chemicals (e.g., acetic acid), while S32760 (with copper/tungsten) handles sulfuric/nitric acid. Ideal for securing reactor lids and acid tank connections in aggressive chemical environments.
Water Treatment Facilities: Used in desalination plants and wastewater systems. Duplex steel resists chlorinated water and brine, preventing leaks in pipe clamps and filter housings—critical for maintaining water purity.
Power Generation: Fits nuclear plant secondary coolant loops and thermal power boiler lines. Its high-temperature strength (up to 500°C) and corrosion resistance ensure long-term sealing in high-pressure, heat-intensive settings.
A1: Duplex 2205 (mild corrosion), Super Duplex 2507 (saltwater/offshore), Super Duplex S32760 (harsh chemicals/extreme pressure).
A2: Yes! Provide your drawing, and we’ll manufacture custom washers. Lead time: 3–5 weeks based on size/quantity.
A3: Pair duplex washers with duplex or compatible alloy bolts. For stainless steel bolts, apply anti-corrosion grease to the thread interface.
A4: 12-month warranty against material defects. If corrosion or cracking occurs under normal use, we offer replacements or refunds.
Duplex 2205
UNS | ID | JIS | W.Nr |
| S31803 | F51 | SUS32953L | 1.4462 |
Chemical composition of duplex 2205
| Alloy | % | Ni | Cr | Fe | Mo | N | C | Mn | Si | S | P |
| Duplex 2205 | Min. | 4.5 | 21 | margin | 2.5 | 0.08 | |||||
| Min. | 6.5 | 23 | 3.5 | 0.2 | 0.03 | 2 | 1 | 0.02 | 0.03 |
Minimum mechanical properties of duplex 2205 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 |
Super Duplex 2507
UNS | ID | AISI/ASTM | W.Nr |
| S32750 | F53 | 2507 | 1.4410 |
Chemical composition of Super Duplex 2507
| Alloy | % | Ni | Cr | Mo | N | C | Mn | Si | S | P | Cu |
| 2507 | Min. | 6.0 | 24 | 3.0 | 0.24 | 0.08 | |||||
| Min. | 8.0 | 26 | 5.0 | 0.32 | 0.03 | 1.2 | 0.08 | 0.02 | 0.035 | 0.5 |
Minimum mechanical properties of alloy for Super Duplex 2507 at room temperature
| Tensile strength Rm N/mm2 | Yield strength RP0.2 N/mm2 | Elongation rate A5% | Brinell hardness HB |
| 800 | 550 | 15 | 310 |
Super Duplex S32760
UNS | ID | W.Nr |
| S32760 | F55 | 1.4501 |
Chemical composition of Super Duplex S32760
| Alloy | % | Ni | Cr | Mo | N | C | Mn | Si | S | P | Cu | W |
| F55 | Min. | 6.0 | 24 | 3.0 | 0.2 | |||||||
| Min. | 8.0 | 26 | 4.0 | 0.3 | 0.03 | 1.0 | 1.0 | 0.01 | 0.03 | 1.0 | 1.0 |
Minimum mechanical properties of Super Duplex S32760 alloy at room temperature
| Tensile strength Rm N/mm2 | Yield strength RP0.2 N/mm2 | Elongation rate A5% |
| 820 | 550 | 25 |
Our Duplex Washer is a premium sealing solution designed to pair with heavy-duty fasteners in harsh industrial settings, manufactured by HT&FST. It is available in three high-performance duplex stainless steel grades:
Duplex 2205 (UNS S31803, ID F51, JIS SUS32953L, W.Nr 1.4462)
Super Duplex 2507 (UNS S32750, ID F53, AISI/ASTM 2507, W.Nr 1.4410)
Super Duplex S32760 (UNS S32760, ID F55, W.Nr 1.4501)
Adhering to global standards (DIN125A/DIN9021/DIN434, ISO7089/ISO7093, ASME B 18.22.1), it covers sizes from M5 to M100, with non-standard options via OEM. Each washer holds EN10204-3.1B certification and features a bright & clean finish, ensuring durability and compatibility with diverse fasteners.
Name | Duplex washer |
Standard | DIN125A/DIN9021/DIN434,ISO7089/ISO7093,ASME B 18.22.1 |
Size Range | M5-M100 or non-standard as requested |
Finish | Bright&Clean |
Marking | HT&FST or customization |
Material | Duplex 2205 & Super duplex 2507 & S32760 |
Grade | Grade HV200 |
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 |
Duplex 2205: Tensile strength 620 N/mm², yield strength 450 N/mm², elongation rate 25%, Brinell hardness 290 HB—ideal for medium-pressure applications.
Super Duplex 2507: Tensile strength 800 N/mm², yield strength 550 N/mm², elongation rate 15%, Brinell hardness 310 HB—suited for high-stress, offshore environments.
Super Duplex S32760: Tensile strength 820 N/mm², yield strength 550 N/mm², elongation rate 25%—combines strength with ductility for extreme chemicals.
Duplex 2205: 21–23% chromium + 4.5–6.5% nickel + 2.5–3.5% molybdenum resists freshwater and mild chemicals.
Super Duplex 2507: 24–26% chromium + 6.0–8.0% nickel + nitrogen (0.24–0.32%) enhances saltwater and chloride resistance.
Super Duplex S32760: Adds copper (1.0%) and tungsten (1.0%) to 24–26% chromium, resisting sulfuric acid and stress corrosion cracking.
Marking Options: Standard HT&FST marking; custom logos/part numbers available for branding.
Packaging Flexibility: Standard bulk packaging (boxes → cartons → pallets); custom moisture-proof or tamper-evident packaging upon request.
Sample Support: Free samples to test compatibility with your bolts and validate performance.
Oil & Gas Offshore Operations: Super Duplex 2507/S32760 DIN125A Washers pair with heavy-duty fasteners in offshore platforms and subsea pipelines. They withstand high pressure and saltwater corrosion, ensuring leak-free sealing for deepwater drilling rigs.
Chemical Processing: Duplex 2205 variants resist mild chemicals (e.g., acetic acid), while S32760 (with copper/tungsten) handles sulfuric/nitric acid. Ideal for securing reactor lids and acid tank connections in aggressive chemical environments.
Water Treatment Facilities: Used in desalination plants and wastewater systems. Duplex steel resists chlorinated water and brine, preventing leaks in pipe clamps and filter housings—critical for maintaining water purity.
Power Generation: Fits nuclear plant secondary coolant loops and thermal power boiler lines. Its high-temperature strength (up to 500°C) and corrosion resistance ensure long-term sealing in high-pressure, heat-intensive settings.
A1: Duplex 2205 (mild corrosion), Super Duplex 2507 (saltwater/offshore), Super Duplex S32760 (harsh chemicals/extreme pressure).
A2: Yes! Provide your drawing, and we’ll manufacture custom washers. Lead time: 3–5 weeks based on size/quantity.
A3: Pair duplex washers with duplex or compatible alloy bolts. For stainless steel bolts, apply anti-corrosion grease to the thread interface.
A4: 12-month warranty against material defects. If corrosion or cracking occurs under normal use, we offer replacements or refunds.
Duplex 2205
UNS | ID | JIS | W.Nr |
| S31803 | F51 | SUS32953L | 1.4462 |
Chemical composition of duplex 2205
| Alloy | % | Ni | Cr | Fe | Mo | N | C | Mn | Si | S | P |
| Duplex 2205 | Min. | 4.5 | 21 | margin | 2.5 | 0.08 | |||||
| Min. | 6.5 | 23 | 3.5 | 0.2 | 0.03 | 2 | 1 | 0.02 | 0.03 |
Minimum mechanical properties of duplex 2205 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 |
Super Duplex 2507
UNS | ID | AISI/ASTM | W.Nr |
| S32750 | F53 | 2507 | 1.4410 |
Chemical composition of Super Duplex 2507
| Alloy | % | Ni | Cr | Mo | N | C | Mn | Si | S | P | Cu |
| 2507 | Min. | 6.0 | 24 | 3.0 | 0.24 | 0.08 | |||||
| Min. | 8.0 | 26 | 5.0 | 0.32 | 0.03 | 1.2 | 0.08 | 0.02 | 0.035 | 0.5 |
Minimum mechanical properties of alloy for Super Duplex 2507 at room temperature
| Tensile strength Rm N/mm2 | Yield strength RP0.2 N/mm2 | Elongation rate A5% | Brinell hardness HB |
| 800 | 550 | 15 | 310 |
Super Duplex S32760
UNS | ID | W.Nr |
| S32760 | F55 | 1.4501 |
Chemical composition of Super Duplex S32760
| Alloy | % | Ni | Cr | Mo | N | C | Mn | Si | S | P | Cu | W |
| F55 | Min. | 6.0 | 24 | 3.0 | 0.2 | |||||||
| Min. | 8.0 | 26 | 4.0 | 0.3 | 0.03 | 1.0 | 1.0 | 0.01 | 0.03 | 1.0 | 1.0 |
Minimum mechanical properties of Super Duplex S32760 alloy at room temperature
| Tensile strength Rm N/mm2 | Yield strength RP0.2 N/mm2 | Elongation rate A5% |
| 820 | 550 | 25 |
