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Duplex Steel S32205 Washers are high-performance fastening components designed to distribute load, prevent surface damage, and maintain joint integrity in aggressive environments. Manufactured from UNS S32205 duplex stainless steel, these washers combine austenitic and ferritic microstructures, delivering superior strength and enhanced resistance to chloride-induced corrosion compared to conventional stainless grades.
Widely used in offshore oil & gas, chemical processing, desalination plants, and marine engineering, Duplex Steel S32205 Washers conform to standards such as ASTM A240, ASTM A276, and ISO specifications for dimensional accuracy and material consistency. Their high yield strength—nearly double that of austenitic stainless steels like 304 and 316—makes them ideal for load-bearing assemblies and vibration-prone applications.
KK Fasteners supplies these washers to global industrial projects, ensuring full material traceability, compliance with international standards, and consistent quality across bulk export orders. For procurement teams, selecting the right washer material directly impacts joint longevity, maintenance cycles, and operational safety.
| Parameter | Specification |
|---|---|
| Material | Duplex Stainless Steel (UNS S32205 / S31803) |
| Grade | ASTM A240 / A276 S32205 |
| Size Range | M3 to M100 / 1/8” to 4” |
| Standard Types | Plain Washers, Spring Washers, Flat Washers, Fender Washers |
| Thread Compatibility | Metric, UNC, UNF |
| Standards | DIN 125, DIN 127, ISO 7089, ASTM F436 |
| Surface Finish | Pickled, Passivated, Polished, Shot Blasted |
| Hardness | Approx. 250–290 HB |
| Tensile Strength | ≥ 620 MPa |
| Yield Strength | ≥ 450 MPa |
| S32205 | C | N | P | Si | Mn | Mo | Fe | Cr | S | Ni |
| 1.0 | 0.03 | 0.02 | 2.0 | 3.0 – 3.5 | 22.0 – 23.0 | 0.03 | 4.5 – 6.5 | 0.14 – 0.2 | Bal |
| S32205 | Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 80000 , MPa – 550 | Psi – 116000 , MPa – 800 | 15 % |
| STANDARD | UNS | WERKSTOFF NR. |
| Duplex S32205 | S32205 | 1.4462 |
Bolt Size
|
USS
|
SAE
|
||||
OD (in.)
|
ID (in.)
|
Thickness
|
OD (in.)
|
ID (in.)
|
Thickness
|
|
1/8 (#6)
|
-
|
-
|
-
|
0.375
|
0.156
|
.036/.065
|
5/32 (#8)
|
-
|
-
|
-
|
0.438
|
0.188
|
.036/.065
|
3/16 (#10)
|
0.560
|
0.250
|
.036/.065
|
0.500
|
0.220
|
.036/.065
|
7/32 (#12)
|
-
|
-
|
-
|
0.562
|
0.250
|
.051/.080
|
1/4 (#14)
|
0.734
|
0.312
|
.051/.080
|
0.625
|
0.281
|
.051/.080
|
5/16
|
0.875
|
0.375
|
.064/.104
|
0.688
|
0.344
|
.051/.080
|
3/8
|
1.000
|
0.438
|
.064/.104
|
0.812
|
0.406
|
.051/.080
|
7/16
|
1.250
|
0.500
|
.064/.104
|
0.922
|
0.469
|
.051/.080
|
1/2
|
1.375
|
0.562
|
.086/.132
|
1.062
|
0.531
|
.074/.121
|
9/16
|
1.469
|
0.625
|
.086/.132
|
1.156
|
0.594
|
.074/.121
|
5/8
|
1.750
|
0.688
|
.108/.160
|
1.312
|
0.656
|
.074/.121
|
3/4
|
2.000
|
0.812
|
.122/.177
|
1.469
|
0.812
|
.108/.160
|
7/8
|
2.250
|
0.938
|
.136/.192
|
1.750
|
0.938
|
.108/.160
|
1
|
2.500
|
1.062
|
.136/.192
|
2.000
|
1.062
|
.108/.160
|
1 1/8
|
2.750
|
1.250
|
.136/.192
|
2.250
|
1.250
|
.108/.160
|
1 1/4
|
3.000
|
1.375
|
.136/.192
|
2.500
|
1.375
|
.136/.192
|
1 3/8
|
3.250
|
1.500
|
.153/.213
|
2.750
|
1.500
|
.136/.213
|
1 1/2
|
3.500
|
1.625
|
.153/.213
|
3.000
|
1.625
|
.153/.213
|
1 5/8
|
3.750
|
1.750
|
.153/.213
|
-
|
-
|
-
|
1 3/4
|
4.000
|
1.875
|
.153/.213
|
-
|
-
|
-
|
1 7/8
|
4.250
|
2.000
|
.153/.213
|
-
|
-
|
-
|
2
|
4.500
|
2.125
|
.153/.213
|
-
|
-
|
-
|
2 1/4
|
4.750
|
2.375
|
.320/.248
|
-
|
-
|
-
|
2 1/2
|
5.000
|
2.625
|
.210/.280
|
-
|
-
|
-
|
2 3/4
|
5.250
|
2.875
|
.228/.410S
|
-
|
-
|
-
|
3
|
5.500
|
3.125
|
.249/.327
|
-
|
-
|
-
|
Size |
USS |
SAE |
||||
|---|---|---|---|---|---|---|
Inside Diameter (A) |
Outside Diameter (B) |
Thickness (C) |
Inside Diameter (A) |
Outside Diameter (B) |
Thickness (C) |
|
#2 |
- |
- |
- |
3/32" |
1/4" |
0.020" |
#4 |
- |
- |
- |
1/8" |
5/16" |
0.032" |
#6 |
- |
- |
- |
5/32" |
3/8" |
0.049" |
#8 |
- |
- |
- |
3/16" |
7/16" |
0.049" |
#10 |
- |
- |
- |
7/32" |
1/2" |
0.049" |
#12 |
- |
- |
- |
1/4" |
9/16" |
0.065" |
1/4" |
5/16" |
0.734" |
0.065" |
9/32" |
5/8" |
0.065" |
5/16" |
3/8" |
7/8" |
0.083" |
11/32" |
11/16" |
0.065" |
3/8" |
7/16" |
1" |
0.083" |
13/32" |
13/16" |
0.065" |
7/16" |
1/2" |
1-1/4" |
0.083" |
15/32" |
15/16" |
0.065" |
1/2" |
9/16" |
1-3/8" |
0.109" |
17/32" |
1-1/16" |
0.095" |
9/16" |
5/8" |
1-15/32" |
0.109" |
19/32" |
1-5/32" |
0.095" |
5/8" |
11/16" |
1-3/4" |
0.134" |
21/32" |
1-5/16" |
0.095" |
3/4" |
13/16" |
2" |
0.148" |
13/16" |
1-15/32" |
0.134" |
7/8" |
15/16" |
2-1/4" |
0.165" |
15/16" |
1-3/4" |
0.134" |
1" |
1-1/16" |
2-1/2" |
0.165" |
1-1/16" |
2" |
0.134" |
1-1/8" |
1-1/4" |
2-3/4" |
0.165" |
- |
- |
- |
1-1/4" |
1-3/8" |
3" |
0.165" |
- |
- |
- |
1-3/8" |
1-1/2" |
3-1/4" |
0.180" |
- |
- |
- |
1-1/2" |
1-5/8" |
3-1/2" |
0.180" |
- |
- |
- |
1-5/8" |
1-3/4" |
3-3/4" |
0.180" |
- |
- |
- |
1-3/4" |
1-7/8" |
4" |
0.180" |
- |
- |
- |
2" |
2-1/8" |
4-1/2" |
0.213" |
- |
- |
- |
Duplex Steel S32205 Washers are used in applications where high strength and corrosion resistance are critical for long-term joint reliability.
Duplex Steel S32205 Washers are typically produced through precision stamping or CNC machining, followed by solution annealing and controlled cooling to maintain the desired duplex microstructure. Surface treatments such as pickling and passivation enhance corrosion resistance by removing free iron and contaminants.
Quality assurance includes dimensional inspection using calibrated gauges, hardness testing, tensile verification, and surface finish checks. Each batch undergoes material traceability validation with mill test certificates (MTCs).
At KK Fasteners, inspection protocols align with ISO 9001 standards, ensuring consistent product quality for export shipments. Additional compliance with RoHS and REACH requirements supports global project specifications.
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Duplex Steel S32205 washers are high-strength fastening components made from duplex stainless steel UNS S32205. They are designed to distribute load in bolted joints while offering excellent resistance to corrosion, especially in chloride-rich and marine environments.
Yes, S32205 washers provide significantly higher mechanical strength and better resistance to pitting and stress corrosion cracking compared to stainless steel 316. This makes them more suitable for offshore, chemical, and high-pressure industrial applications.
These washers are commonly manufactured according to DIN 125, DIN 127, ISO 7089, and ASTM F436 standards. The material itself conforms to ASTM A240 and ASTM A276 specifications for chemical composition and mechanical properties.
Selection depends on load conditions, environmental exposure, and bolt compatibility. S32205 washers are ideal for corrosive environments such as seawater systems, chemical plants, and offshore structures due to their high strength and corrosion resistance.
Look for suppliers with ISO certification, material traceability, and compliance with international standards like ASTM and DIN. A dependable manufacturer such as KK Fasteners ensures tested quality, proper documentation, and consistent global supply support.
Selecting the right washer material directly impacts joint performance, especially in corrosive and high-load environments. Duplex Steel S32205 Washers offer a proven balance of strength and durability for critical applications.
KK Fasteners provides consistent supply with verified material quality and export-ready packaging. For project-specific requirements or bulk inquiries, request a quote or connect with the engineering team to discuss your specifications.
