Standard:DIN9021
Description:
DIN 9021 washers, also known as heavy washers, are designed to provide a larger bearing surface and distribute the load when used with bolts or screws. These washers conform to the DIN 9021 standard, which specifies their dimensions and tolerances. They are available in a wide range of metric sizes, from M6 to M100, accommodating various bolt sizes.
When specified with a "Black Oxide" finish, DIN 9021 washers have undergone a surface treatment process known as black oxide coating. Black oxide coating, also referred to as blackening, is a conversion coating that creates a thin layer of black oxide on the surface of the washer.
The black oxide coating serves multiple purposes. First, it provides a degree of corrosion resistance, although its level of protection may not be as high as that of other coatings like hot-dip galvanizing or Dacromet. Second, the black oxide finish enhances the aesthetics of the washers, giving them a sleek black appearance. Lastly, the black oxide layer can improve the wear resistance and lubricity of the washers, facilitating smooth assembly and operation.
DIN 9021 washers with a black oxide finish find applications in various industries, including automotive, construction, machinery, and more. They are commonly used in environments where moderate corrosion resistance is required, or where the black appearance adds visual appeal.
| 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
