The duplex 2205 fasteners are usually made of an austenitic-ferritic stainless steel that makes it stronger compared to other fasteners. It’s made up of different components such as 22 percent chromium, 5 percent nickel, and 3 percent molybdenum with a minimum tensile strength of 620 MPa and yield strength of 450 MPa. These fasteners are fabricated through cold forming, hot forging, machining and precision threading operations, depending upon the design of fasteners. They have a PREN of about 35, which corresponds to resistance to chloride-induced pitting and crevice corrosion. Jade Alloys produces the Duplex 2205 Fasteners in India such as Bolts, Nuts, Studs, Threaded Rods, Screws and washers, all with material traceability and testing documentation for challenging industrial applications.
Specifications of Duplex 2205 Fasteners
| Attribute | Specification Details |
|---|---|
| Material Specifications | ASTM A276 / ASME SA276, ASTM A479 / ASME SA479, ASTM A182 / ASME SA182 Grade F51 / F60 |
| Dimensional Standards | ASME B18.2.1, ASME B18.2.2, ASME B18.3, ASME B18.21.1, DIN 931, DIN 933, DIN 934, DIN 125, ISO 4014, ISO 4017 |
| Size Range | Imperial: 1/4″ to 2.1/2″ diameter | Metric: M3 to M64 diameter (Custom sizes available) |
| Thread Profiles | Metric Coarse, Metric Fine, UNC, UNF, 8-UN, BSW, BSF (Class 2A/2B, 6g/6H) |
| Fastener Types | Hex Head Bolts, Heavy Hex Bolts, Stud Bolts (All-Thread, Double-End), Heavy Hex Nuts, Flat Washers, Spring Washers, Socket Head Cap Screws, Threaded Rods, U-Bolts |
| Surface Finishes | Plain / Bright Machined, Passivated, Electropolished, PTFE / Xylan® Coated, Zinc-Nickel Plated |
| Testing & Certification | MTC per EN 10204 3.1 / 3.2, PMI 100% Tested, Hardness, Tensile, Microstructure (ASTM A923 Method C), NACE MR0175/ISO 15156 |
Chemical Compositions of Duplex 2205 Fasteners
| Grade | C (max) | Mn (max) | Ni | N | Cr | Mo | Si (max) | P (max) | S (max) | Fe (min) |
|---|---|---|---|---|---|---|---|---|---|---|
| S31803 | 0.030 | 2.00 | 4.50 – 6.50 | 0.08 – 0.20 | 21.0 – 23.0 | 2.50 – 3.50 | 1.00 | 0.030 | 0.020 | 63.72 |
| S32205 | 0.030 | 2.00 | 4.50 – 6.50 | 0.14 – 0.20 | 22.0 – 23.0 | 3.00 – 3.50 | 1.00 | 0.030 | 0.020 | 63.54 |
Mechanical & Physical Properties of S31803 / S32205 Fasteners
| Grade | Density | Melting Point | Yield Strength (0.2% Offset) | Tensile Strength | Elongation |
|---|---|---|---|---|---|
| S31803 / S32205 | 7.8 g/cm³ | 1350 °C (2460 °F) | 550 MPa (80,000 psi) | 800 MPa (116,000 psi) | 15% |
Types of Duplex 2205 Fasteners
Accessories
Bolts
Components
Fasteners
Nuts
Pins
Screws
Spring
Stud Bolts
Threaded Rods
Washers
Equivalent Grades of Duplex 2205 Fasteners
| Duplex Grade | Common Name | European DIN | UNS | ASTM / ASME |
|---|---|---|---|---|
| Duplex Steel S31803 / S32205 | SAF 2205® | 1.4462 | S31803 / S32205 | F51 / F60 |
Torque Rating Chart of Duplex 2205 Fasteners
| Nominal Diameter (in) | Threads / in | Torque (ft-lb) – Dry | Torque (ft-lb) – Lubricated |
|---|---|---|---|
| 1/4″ | 20 | 6.5 | 4.8 |
| 1/4″ | 28 | 7.4 | 5.5 |
| 5/16″ | 18 | 13.2 | 10.0 |
| 5/16″ | 24 | 14.7 | 11.0 |
| 3/8″ | 16 | 23.5 | 17.7 |
| 3/8″ | 24 | 26.6 | 19.9 |
| 7/16″ | 14 | 37.6 | 28.2 |
| 7/16″ | 20 | 42.0 | 31.5 |
| 1/2″ | 13 | 57.4 | 43.0 |
| 1/2″ | 20 | 64.7 | 48.5 |
| 9/16″ | 12 | 82.7 | 62.1 |
| 9/16″ | 18 | 92.3 | 69.2 |
| 5/8″ | 11 | 114.2 | 85.7 |
| 5/8″ | 18 | 129.3 | 97.0 |
| 3/4″ | 10 | 203 | 152 |
| 3/4″ | 16 | 226 | 170 |
| 7/8″ | 9 | 326 | 245 |
| 7/8″ | 14 | 361 | 270 |
| 1″ | 8 | 490 | 368 |
| 1″ | 14 | 549 | 412 |
| 1-1/4″ | 7 | 853 | 639 |
| 1-1/4″ | 12 | 944 | 708 |
| 1-1/2″ | 6 | 1484 | 1112 |
| 1-1/2″ | 12 | 1669 | 1252 |
Dimensions Chart of Duplex 2205 Fasteners
| Bolt Size | SAE OD (in.) | SAE ID (in.) | SAE Thickness (in.) | USS OD (in.) | USS ID (in.) | USS Thickness (in.) |
|---|---|---|---|---|---|---|
| 1/8 (#6) | 0.375 | 0.156 | .036 / .065 | — | — | — |
| 5/32 (#8) | 0.438 | 0.188 | .036 / .065 | — | — | — |
| 3/16 (#10) | 0.500 | 0.220 | .036 / .065 | 0.560 | 0.250 | .036 / .065 |
| 7/32 (#12) | 0.562 | 0.250 | .051 / .080 | — | — | — |
| 1/4 (#14) | 0.625 | 0.281 | .051 / .080 | 0.734 | 0.312 | .051 / .080 |
| 5/16 | 0.688 | 0.344 | .051 / .080 | 0.875 | 0.375 | .064 / .104 |
| 3/8 | 0.812 | 0.406 | .051 / .080 | 1.000 | 0.438 | .064 / .104 |
| 7/16 | 0.922 | 0.469 | .051 / .080 | 1.250 | 0.500 | .064 / .104 |
| 1/2 | 1.062 | 0.531 | .074 / .121 | 1.375 | 0.562 | .086 / .132 |
| 9/16 | 1.156 | 0.594 | .074 / .121 | 1.469 | 0.625 | .086 / .132 |
| 5/8 | 1.312 | 0.656 | .074 / .121 | 1.750 | 0.688 | .108 / .160 |
| 3/4 | 1.469 | 0.812 | .108 / .160 | 2.000 | 0.812 | .122 / .177 |
| 7/8 | 1.750 | 0.938 | .108 / .160 | 2.250 | 0.938 | .136 / .192 |
| 1 | 2.000 | 1.062 | .108 / .160 | 2.500 | 1.062 | .136 / .192 |
| 1 1/8 | 2.250 | 1.250 | .108 / .160 | 2.750 | 1.250 | .136 / .192 |
| 1 1/4 | 2.500 | 1.375 | .136 / .192 | 3.000 | 1.375 | .136 / .192 |
| 1 3/8 | 2.750 | 1.500 | .136 / .213 | 3.250 | 1.500 | .153 / .213 |
| 1 1/2 | 3.000 | 1.625 | .153 / .213 | 3.500 | 1.625 | .153 / .213 |
Duplex Steel S31803 Nut Size Chart
| Nut Size (mm) | Diameter Across Flats (mm) | Hex Nut Height (mm) | Nylock Nut Height (mm) | Jam Nut Height (mm) |
|---|---|---|---|---|
| M2 | 4 | 1.6 | — | 1.2 |
| M2.5 | 5 | 2 | — | 1.6 |
| M3 | 5.5 | 2.4 | 4 | 1.8 |
| M4 | 7 | 3.2 | 5 | 2.2 |
| M5 | 8 | 4 | 5 | 2.7 |
| M6 | 10 | 5 | 6 | 3.2 |
| M7 | 11 | 5.5 | — | 3.5 |
| M8 | 13 | 6.5 | 8 | 4 |
| M10 | 17 | 8 | 10 | 5 |
| M12 | 19 | 10 | 12 | 6 |
| M14 | 22 | 11 | 14 | 7 |
| M16 | 24 | 13 | 16 | 8 |
| M18 | 27 | 15 | 18.5 | 9 |
| M20 | 30 | 16 | 20 | 10 |
Applications and Industrial Uses of Duplex 2205 Fasteners
- Oil & Gas Industry
- Chemical Processing Industry
- Petrochemical Industry
- Marine & Offshore Industry
- Power Generation Industry
- Desalination & Water Treatment Industry
- Pulp & Paper Industry
- Mining & Mineral Processing Industry
Frequently Asked Questions
1. What are Duplex 2205 Fasteners?
Duplex 2205 Fasteners are high-strength stainless steel fasteners made from UNS S31803/S32205, offering excellent strength and corrosion resistance.
2. What are Duplex 2205 Fasteners used for?
They are used for joining pipes, flanges, valves, equipment, and structures in corrosive industrial environments.
3. What is the difference between UNS S31803 and UNS S32205 Fasteners?
Both are Duplex 2205 grades, but S32205 has tighter chemical composition limits and is the more commonly specified version.
4. Are Duplex 2205 Fasteners corrosion resistant?
Yes. They provide strong resistance to chloride pitting, crevice corrosion, and stress corrosion cracking.
5. What does PREN mean and why does it matter?
PREN means Pitting Resistance Equivalent Number and indicates an alloy’s resistance to chloride-induced pitting and crevice corrosion. Duplex 2205 has a PREN of about 35, higher than typical 316 stainless steel.
6. What standard applies A276 A479 or A182?
ASTM A276 covers general-purpose bar, ASTM A479 covers pressure-vessel and heat-resistant bar, while ASTM A182 F51/F60 covers forged components.
