Description
The Large Flat Washer manufactured to DIN 9021 standards is a high-performance fastening component designed for enhanced load distribution and surface protection. Featuring a significantly larger outer diameter than standard flat washers, this washer increases the contact area under the bolt or nut head, reducing surface stress and preventing material deformation.
Produced in 304 or 316 stainless steel, this stainless steel washer offers excellent corrosion resistance, strength, and long-term durability. It is widely used in construction, heavy equipment, marine systems, structural steel assemblies, and industrial fasteners where improved load dispersion and joint reinforcement are required.
The DIN 9021 Large Flat Washer is particularly suitable for applications involving softer materials, oversized holes, or heavy clamping forces that demand additional support and stability.
Features & Benefits
- Superior Corrosion Resistance: Forged from high-grade 304 or 316 stainless steel, these washers offer long-lasting performance in humid, marine, and chemical environments, resisting rust and oxidation even under prolonged exposure.
- Wider Bearing Surface: The significant outer diameter of the Large Flat Washer evenly distributes load across a broader area. This prevents the fastener head from sinking into or crushing the contact material, which is critical when working with wood, plastics, or thin sheet metal.
- Precision and Fit: Manufactured strictly to DIN 9021 standards, these fasteners feature high concentricity, a smooth circular surface, and consistent thickness. This ensures a professional aesthetic and a reliable fit in automated or manual assemblies.
- High Strength & Durability: These washers are built to withstand heavy tightening forces without bowing or deforming, maintaining structural integrity and constant tension in the fastened joint over time.
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: When should I use a DIN 9021 Large Flat Washer instead of a standard DIN 125 washer?
A: You should choose a Large Flat Washer when the material being fastened is soft (like timber or plastic) or very thin. Because the DIN 9021 has a much larger outer diameter, it spreads the force over more surface area, preventing the bolt head from damaging the material.
Q2: Is there a difference between a "Large Flat Washer" and a "Fender Washer"?
A: They are very similar in function. In metric standards, "Large Flat Washer" usually refers to DIN 9021. In the US (imperial) system, these are often called "Fender Washers." Both prioritize a wide outer diameter relative to the bolt size.
Q3. Can these washers be used with power tools?
A: Yes. These stainless steel washers are engineered to handle high torque and heavy tightening forces from impact drivers or wrenches without warping, provided they are matched to the correct bolt strength grade.
Q4: Can this washer be used with oversized holes?
A: Yes. The larger outer diameter makes it ideal for covering oversized or slotted holes while maintaining secure fastening.
