Description
The Thick Flat Washer manufactured to DIN 9021 standards is a heavy-duty fastening component engineered for high-load and corrosive environments. Featuring a large outer diameter and increased thickness, this washer provides superior load distribution, enhanced surface protection, and improved joint reinforcement compared to standard flat washers.
Constructed from 2205 duplex stainless steel, this stainless steel washer delivers exceptional mechanical strength and advanced corrosion resistance. Its duplex microstructure combines the advantages of austenitic and ferritic stainless steels, offering superior resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. This makes it particularly suitable for offshore, marine, chemical processing, structural, and heavy industrial fasteners applications.
Designed for demanding conditions, the DIN 9021 Thick Flat Washer ensures long-term structural reliability and performance under high mechanical stress.
Features & Benefits
- Exceptional Mechanical Strength: With a yield strength of 400–550 MPa, 2205 duplex steel provides nearly double the strength of common stainless steel washers like 304 or 316. This allows for higher pre-loads and greater resistance to deformation under extreme stress.
- Superior Corrosion & SCC Resistance: Engineered for harsh environments, this Thick Flat Washer offers unmatched resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking, making it the industry standard for offshore oil and gas and desalination plants.
- Enhanced Load Bearing & Stability: The combination of a large outer diameter and increased thickness ensures that fastening loads are distributed over a much wider surface area. This reduces localized stress on the material and provides a more rigid, stable joint for heavy machinery.
- High Dimensional Precision: Manufactured to strict DIN 9021 tolerances, each Flat Washer features precise concentricity, a smooth burr-free surface, and uniform thickness to ensure seamless integration into high-torque industrial assemblies.
Specification
|
Specification |
DIN9021(GB96.1、IS07093-1) |
|||
|
Inside diameter |
Outside diameter |
Thickness |
Thousand-piece weight |
|
|
Φ3 |
3.20-3.38 |
8.64-9.00 |
0.8±0.1 |
0.349 |
|
Φ4 |
4.30-4.48 |
11.57-12.00 |
1.0±0.1 |
0.774 |
|
Φ5 |
5.30-5.48 |
14.57-15.00 |
1.0±0.1 |
1.46 |
|
Φ6 |
6.40-6.62 |
17.57-18.00 |
1.6±0.2 |
2.79 |
|
Φ8 |
8.40-8.62 |
23.48-24.00 |
2.0±0.2 |
6.23 |
|
Φ10 |
10.50-10.77 |
29.48-30.00 |
2.5±0.2 |
12.2 |
|
Φ12 |
13.00-13.27 |
36.38-37.00 |
3.0±0.3 |
22.2 |
|
Φ14 |
15.00-15.27 |
43.38-44.00 |
3.0±0.3 |
31.6 |
|
Φ16 |
17.00-17.27 |
49.38-50.00 |
3.0±0.3 |
40.9 |
|
Φ18 |
19.00-19.33 |
54.10-56.00 |
4.0±0.3 |
67.4 |
|
Φ20 |
21.00-21.33 |
59.26-60.00 |
4.0±0.3 |
76.8 |
|
Φ22 |
23.00-23.52 |
64.80-66.00 |
5.0±0.6 |
118 |
|
Φ24 |
25.00-25.52 |
70.80-72.00 |
5.0±0.6 |
140.5 |
|
Φ27 |
30.00-30.52 |
83.60-85.00 |
6.0±0.6 |
234 |
|
Φ30 |
33.00-33.62 |
90.60-92.00 |
6.0±0.6 |
273 |
|
Φ33 |
36.00-36.62 |
103.60-105.00 |
6.0±0.6 |
360 |
|
Φ36 |
39.00-39.62 |
108.60-110.00 |
8.0±1.2 |
522 |
FAQ:
Q1: Why should I use 2205 Duplex instead of 316 Stainless Steel for a Thick Flat Washer?
A: While 316 is excellent for general marine use, 2205 Duplex is far superior for high-load, high-chloride environments. It is twice as strong, meaning you can often use thinner or smaller components to achieve the same structural integrity, and it is significantly more resistant to stress corrosion cracking, which is a common failure mode in 300-series steels.
Q2: What is the advantage of the "Thick" profile in the DIN 9021 series?
A: The increased thickness prevents the washer from "cupping" or bowing when high torque is applied to the bolt. When combined with the large outer diameter, the Thick Flat Washer provides a rigid platform that protects soft or thin materials from crushing while maintaining constant tension in the assembly.
Q3: Is 2205 Duplex Stainless Steel magnetic?
A: Yes. Unlike 304 and 316 stainless steel, which are austenitic and non-magnetic, 2205 Duplex contains a ferritic phase. This makes the fasteners magnetic, which can be a useful property for sorting or retrieval in industrial settings.
Q4: In which industries is this washer most commonly used?
A: Due to its high strength and corrosion resistance, it is primarily used in offshore energy (wind/oil/gas), chemical storage tanks, wastewater treatment, and heavy marine construction.
Q5: Can custom sizes be manufactured?
A: Yes. Custom diameters, thicknesses, and specifications can be produced based on project requirements.
