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Duplex Steel S32205 Nuts are engineered fastening components designed for high-load and corrosive environments where conventional stainless steel grades like SS 304 or SS 316 may fail under chloride stress. Manufactured from UNS S32205 duplex stainless steel, these nuts combine a balanced austenitic-ferritic microstructure, delivering superior tensile strength and exceptional resistance to pitting and crevice corrosion. They are widely used in offshore platforms, chemical processing systems, marine engineering, and heavy industrial assemblies where structural integrity is critical.
These fasteners comply with internationally recognized standards such as DIN 934, ISO 4032, ASTM A182, and BS specifications, ensuring interchangeability across global engineering systems. Their dual-phase microstructure provides nearly twice the yield strength of standard austenitic stainless steel, making them ideal for high-pressure and high-vibration environments.
KK Fasteners supplies Duplex Steel S32205 Nuts to OEMs and EPC contractors across global markets, ensuring full material traceability and dimensional precision for mission-critical applications.
| Parameter | Specification |
|---|---|
| Material | Duplex Stainless Steel UNS S32205 (2205) |
| Equivalent Grades | UNS S31803, EN 1.4462 |
| Nut Types | Hex Nuts, Heavy Hex Nuts, Lock Nuts, Slotted Nuts |
| Size Range | M6 to M64 / 1/4" to 2.5" |
| Thread Types | Metric (ISO), UNC, UNF |
| Standards | DIN 934, ISO 4032, ASTM A182, BS 1768 |
| Surface Finish | Black Oxide, Passivated, Polished, PTFE Coated |
| Hardness | 290–310 HB (Approx.) |
| Tensile Strength | 620–880 MPa |
| Yield Strength | ≥ 450 MPa |
| Grade | Common Name | C% | Mn% | Si% | P% | S% | Cr% | Ni% | Mo% | N% |
|---|---|---|---|---|---|---|---|---|---|---|
| 2205 | ||||||||||
| S32205 | 0.030 | 2.00 | 1.00 | 0.030 | 0.020 | 22.0-23.0 | 4.5-6.5 | 3.0-3.5 | 0.14-0.20 |
| Tensile Strength, ksi | 90 min |
|---|---|
| 0.2% Yield Strength, ksi | 65 min |
| Elongation, % | 25 min |
| Hardness [HRC] | 293 max |
| STANDARD | UNS | WNR. |
|---|---|---|
| Duplex Steel 2205 | S32205 | 1.4462 |
All measurements in millimeters
Nominal Size or Basic Major Thread Diameter |
F |
G |
H |
||||||
Width Across Flats |
Width Across Corners |
Thickness |
|||||||
Basic |
Max |
Min |
Max |
Min |
Basic |
Max |
Min |
||
1/4 |
.2500 |
1/2 |
.500 |
.488 |
.577 |
.556 |
15/64 |
.250 |
.218 |
5/16 |
.3125 |
9/16 |
.562 |
.546 |
.650 |
.622 |
19/64 |
.314 |
.280 |
3/8 |
.3750 |
11/16 |
.688 |
.669 |
.794 |
.763 |
23/64 |
.377 |
.341 |
7/16 |
.4375 |
3/4 |
.750 |
.728 |
.866 |
.830 |
27/64 |
.441 |
.403 |
1/2 |
.5000 |
7/8 |
.875 |
.850 |
1.010 |
.969 |
31/64 |
.504 |
.464 |
9/16 |
.5625 |
15/16 |
.938 |
.909 |
1.083 |
1.037 |
35/64 |
.568 |
.526 |
5/8 |
.6250 |
1-1/16 |
1.062 |
1.031 |
1.227 |
1.175 |
39/64 |
.631 |
.587 |
3/4 |
.7500 |
1-1/4 |
1.250 |
1.212 |
1.443 |
1.382 |
47/64 |
.758 |
.710 |
7/8 |
.8750 |
1-7/16 |
1.438 |
1.394 |
1.660 |
1.589 |
55/64 |
.885 |
.833 |
1 |
1.0000 |
1-5/8 |
1.325 |
1.575 |
1.876 |
1.796 |
63/64 |
1.012 |
.956 |
1-1/8 |
1.1250 |
1-13/16 |
1.812 |
1.756 |
2.093 |
2.002 |
1-7/64 |
1.139 |
1.079 |
1-1/4 |
1.2500 |
2 |
2.000 |
1.938 |
2.309 |
2.209 |
1-7/32 |
1.251 |
1.187 |
1-3/8 |
1.3750 |
2-3/16 |
2.188 |
2.119 |
2.526 |
2.416 |
1-11/32 |
1.378 |
1.460 |
1-1/2 |
1.5000 |
2-3/8 |
2.375 |
2.300 |
2.742 |
2.622 |
1-15/32 |
1.505 |
1.433 |
1-5/8 |
1.6250 |
2-9/16 |
2.562 |
2.481 |
2.959 |
2.828 |
1-19/32 |
1.632 |
1.556 |
1-3/4 |
1.7500 |
2-3/4 |
2.750 |
2.662 |
3.175 |
3.035 |
1-23/32 |
1.759 |
1.679 |
2 |
2.0000 |
3-1/8 |
3.125 |
3.025 |
3.608 |
3.449 |
1-31/32 |
2.013 |
1.925 |
2-1/4 |
2.2500 |
3-1/2 |
3.500 |
3.388 |
4.041 |
3.862 |
2-13/64 |
2.251 |
2.155 |
2-1/2 |
2.5000 |
3-7/8 |
3.875 |
3.750 |
4.474 |
4.275 |
2-29/64 |
2.505 |
2.401 |
2-3/4 |
2.7500 |
4-1/4 |
4.250 |
4.112 |
4.907 |
4.688 |
2-45/64 |
2.759 |
2.647 |
3 |
3.0000 |
4-5/8 |
4.625 |
4.475 |
5.340 |
5.102 |
2-61/64 |
3.013 |
2.893 |
3-1/4 |
3.2500 |
5 |
5.000 |
4.838 |
5.774 |
5.515 |
3-3/16 |
3.252 |
3.124 |
3-1/2 |
3.5000 |
5-3/8 |
5.375 |
5.200 |
6.207 |
5.928 |
3-7/16 |
3.506 |
3.370 |
3-3/4 |
3.7500 |
5-3/4 |
5.750 |
5.562 |
6.640 |
6.341 |
3-11/16 |
3.670 |
3.616 |
4 |
4.0000 |
6-1/8 |
6.125 |
5.925 |
7.073 |
6.755 |
3-15/16 |
4.014 |
3.862 |
Duplex Steel S32205 Nuts are used in industries where corrosion resistance and high mechanical strength are equally critical.
Duplex Steel S32205 Nuts are manufactured using precision cold forging and CNC threading processes, ensuring uniform grain flow and dimensional stability. Heat treatment is carefully controlled to maintain the balanced ferritic-austenitic structure, which is essential for mechanical performance.
Each batch undergoes strict quality inspection including dimensional verification, hardness testing, tensile analysis, and surface finish evaluation. Material traceability is maintained through heat number marking and batch documentation.
KK Fasteners implements ISO 9001:2015-aligned quality systems, along with RoHS and REACH compliance for international exports. This ensures every nut meets global safety and performance expectations before dispatch.
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Duplex Steel S32205 Nuts are high-strength fastening components manufactured from UNS S32205 duplex stainless steel. They combine austenitic and ferritic phases, offering superior mechanical strength and excellent resistance to chloride-induced corrosion. These nuts are widely used in offshore, marine, chemical, and heavy engineering applications where standard stainless steel fasteners may fail under aggressive environments.
S32205 duplex stainless steel provides nearly double the yield strength of SS 316 along with significantly better resistance to pitting and stress corrosion cracking. Its nitrogen-enhanced composition improves toughness and structural stability, making it ideal for high-pressure, high-vibration, and corrosive operating conditions in industrial systems.
These nuts are commonly manufactured in compliance with DIN 934, ISO 4032, ASTM A182, and BS standards. These specifications ensure dimensional accuracy, mechanical reliability, and compatibility with global fastening systems used across engineering and construction industries.
They are used in offshore oil and gas platforms, seawater handling systems, desalination plants, chemical processing units, power generation facilities, and marine engineering structures. Their corrosion resistance and strength make them suitable for environments exposed to saltwater, chemicals, and heavy mechanical stress.
A dependable supplier should offer certified raw materials, full traceability, ISO-compliant production processes, and adherence to international standards. Global export capability and consistent quality inspection are also essential. KK Fasteners supports industrial buyers with tested fasteners, documentation, and export-ready supply chains for critical applications.
Duplex Steel S32205 Nuts deliver a balance of strength and corrosion resistance essential for demanding industrial environments. With precision manufacturing, certified compliance, and export-ready packaging, they are a dependable choice for critical engineering applications.
For technical specifications, pricing, or custom requirements, KK Fasteners supports global procurement teams with responsive engineering assistance and reliable supply solutions
