Standard:DIN9021
Description:
DIN 9021 washers, also known as flat washers, are commonly used in various applications to distribute the load of a threaded fastener, such as a bolt or screw, and provide a smooth surface for the nut or bolt head to bear against. The DIN 9021 standard specifies the dimensions and material requirements for these washers.
The size range of DIN 9021 washers is typically specified in metric measurements, such as M6 to M100. This indicates that DIN 9021 washers can accommodate metric fasteners with diameters ranging from M6 to M100.
DIN 9021 washers are available with two common coating options: zinc plated and hot-dip galvanized (HDG).
Zinc plated DIN 9021 washers have a thin layer of zinc electroplated onto the surface. The zinc coating provides a sacrificial layer that helps protect the washer from corrosion. Zinc plating offers moderate corrosion resistance and is commonly used in indoor or low-corrosion environments.
HDG (hot-dip galvanized) DIN 9021 washers undergo a hot-dip galvanizing process, where they are immersed in a bath of molten zinc. This forms a thicker and more durable zinc coating compared to zinc plating. HDG provides enhanced corrosion resistance and is suitable for outdoor, high-moisture, or corrosive environments.
When selecting between zinc plated and HDG DIN 9021 washers, consider the specific environmental conditions in which they will be used. If the application involves exposure to moisture, humidity, or corrosive substances, HDG DIN 9021 washers would provide better corrosion protection. For indoor or low-corrosion environments, zinc plated DIN 9021 washers may be sufficient.
| Material | 45#/40CR |
| Size | M6-M100 |
| Finish | Plain/black/ZINC/HDG/Dacromet/Mechanical Galvanized |
| Hardness | HV300/HRC35-45 |
| Marking | can be Customized |
| Application | Constrution/Wind turbines/railway line |
| Packing | Carton+ pallet; we can pack washers as your requirements |
| Terms | FOB+shanghai/ningbo |
| Delivery time | 30-70days |
| Size |
Inner diameter(min) |
Inner diameter(max) |
Outside diameter(max) |
Outside diameter(min) |
Thickness (max) |
Nominal size |
Thickness (min) |
| 2.7 | 2.7 | 2.84 | 8 | 7.64 | 0.9 | 0.8 |
0.7 |
| 3.2 | 3.2 | 3.38 | 9 | 8.64 | 0.9 | 0.8 | 0.7 |
| 3.7 | 3.7 | 3.88 | 11 | 10.57 | 0.9 | 0.8 | 0.7 |
| 4.3 | 4.3 | 4.48 | 12 | 11.57 | 1.1 | 1 | 0.9 |
| 5.3 | 5.3 | 5.48 | 15 | 14.57 | 1.4 | 1.2 | 1 |
| 6.4 | 6.4 | 6.62 | 18 | 17.57 | 1.8 | 1.6 | 1.4 |
| 7.4 | 7.4 | 7.62 | 22 | 21.48 | 2.2 | 2 | 1.8 |
| 8.4 | 8.4 | 8.62 | 24 | 23.48 | 2.2 | 2 | 1.8 |
| 10.5 | 10.5 | 10.77 | 30 | 29.48 | 2.7 | 2.5 | 2.3 |
| 13 | 13 | 13.27 | 37 | 36.38 | 3.3 | 3 | 2.7 |
| 15 | 15 | 15.27 | 44 | 43.38 | 3.3 | 3 | 2.7 |
| 17 | 17 | 17.27 | 50 | 49.38 | 3.3 | 3 | 2.7 |
| 20 | 20 | 20.52 | 56 | 54.1 | 4.6 | 4 | 3.4 |
| 22 | 22 | 22.52 | 60 | 58.1 | 4.6 | 4 | 3.4 |
| 26 | 26 | 26.84 | 72 | 70.1 | 6 | 5 | 4 |
| 33 | 33 | 34 | 92 | 89.8 | 7 | 6 | 5 |
| 39 | 39 | 40 | 110 | 107.8 | 9.2 | 8 | 6.8 |
Products pictures for Flat washers
