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Super Duplex Steel S32760 Washers are engineered fastening components designed for extreme mechanical stress, chloride-rich environments, and high-pressure assemblies. Manufactured from UNS S32760 (commonly known as Zeron 100), these washers offer a dual-phase microstructure combining austenitic and ferritic stainless steel properties, resulting in exceptional strength and corrosion resistance. They are widely used in offshore oil & gas platforms, chemical processing units, marine engineering systems, and heavy-duty structural assemblies where conventional stainless steel grades like SS 304 or SS 316 fail under aggressive conditions.
These washers comply with international standards such as DIN 125, DIN 9021, ISO 7089, and ASTM A182/A240 equivalents, ensuring dimensional accuracy and global compatibility. In critical fastening systems, they distribute load evenly, prevent surface damage, and maintain bolt preload integrity under vibration and thermal cycling.
KK Fasteners supplies Super Duplex Steel S32760 Washers to global engineering industries with strict material traceability and dimensional precision, ensuring consistent performance across demanding applications.
| Parameter | Specification |
|---|---|
| Material | Super Duplex Stainless Steel UNS S32760 (Zeron 100) |
| Standards | DIN 125, DIN 9021, ISO 7089, ASTM A240 / A182 |
| Size Range | M3 to M64 / 1/8" to 2.1/2" |
| Hardness | ~28–32 HRC |
| Tensile Strength | ≥ 750 MPa |
| Yield Strength | ≥ 550 MPa |
| Finish | Bright polished, passivated, anti-corrosion coating (optional) |
| Types | Plain Washer, Spring Washer, Flat Washer, Heavy Duty Washer |
| S32760 | C | N | P | Si | Mn | Mo | Ni | Cr | S | Other |
| 0.030 | 0.24/0.32 | 0.035 | 0.80 | 1.20 | 3.0/5.0 | 6.00/8.00 | 24.0/26.0 | 0.020 | Cu:0.50 |
| S32760 | 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. |
| Super Duplex S32760 | S32760 | 1.4410 |
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" |
- |
- |
- |
Super Duplex Steel S32760 Washers are used in industries where structural reliability under extreme conditions is critical. They are primarily deployed in high-corrosion and high-pressure fastening systems.
Super Duplex Steel S32760 Washers are produced through precision cold forging and CNC-controlled machining to achieve consistent dimensional accuracy. Each batch undergoes strict quality validation including hardness testing, tensile strength verification, and surface finish inspection.
Traceability is maintained through heat number marking and material certification in accordance with ISO 9001:2015 quality systems. Additional compliance includes RoHS and REACH standards for global export readiness. At KK Fasteners, every washer lot is inspected for flatness, burr-free edges, and load-bearing consistency to ensure dependable performance in critical applications.
Explore our comprehensive range of products, ensuring you find the perfect solution for your specific requirements.
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Super Duplex Steel S32760 Washers are high-strength fastening components made from UNS S32760 alloy. They are designed to distribute load, protect surfaces, and maintain joint stability in demanding environments such as offshore, marine, and chemical processing systems.
Yes, UNS S32760 provides significantly higher strength and superior resistance to pitting, crevice corrosion, and chloride stress corrosion cracking compared to SS 316. It is specifically developed for aggressive environments where 316 may not offer long-term durability.
Super Duplex Steel S32760 Washers typically conform to international standards such as DIN 125, DIN 9021, ISO 7089, and ASTM A240 or ASTM A182 material specifications, ensuring dimensional accuracy and global interchangeability.
They are widely used in offshore oil and gas platforms, marine equipment, desalination plants, chemical processing units, and high-pressure piping systems where corrosion resistance and structural integrity are critical.
Look for suppliers with ISO-certified manufacturing, full material traceability, adherence to international standards, and proven export experience. Companies like KK Fasteners provide inspection reports, test certificates, and consistent quality for global industrial requirements.
Super Duplex Steel S32760 Washers are engineered for critical performance where standard stainless steels fail under corrosion and stress. With certified manufacturing control and export-ready documentation, KK Fasteners delivers consistent quality for global industrial applications. Contact our technical team to request a quotation, material test certificates, or customized washer specifications for your project requirements.
