Standard:DIN9021
Description:
DIN 9021 washers, also known as hardened steel washers, are available with a black oxide finish. The black oxide coating is a conversion coating that provides several benefits, including enhanced corrosion resistance and improved lubricity. Here are some additional details about DIN 9021 washers with a black oxide finish:
1.Material: DIN 9021 washers with a black oxide finish are made from hardened steel. Hardened steel offers excellent strength and durability, making the washers suitable for high-strength applications.
2.Sizes: These washers are available in various sizes, ranging from M6 to M100. The "M" denotes the metric thread size, and the number represents the thread diameter in millimeters.
3.Black Oxide Finish: The black oxide coating is applied to the surface of the washer. It provides several advantages, including:
Corrosion Resistance: The black oxide finish enhances the washer's resistance to corrosion, protecting it from rust and other forms of oxidation. This makes the washers suitable for use in environments where moisture or exposure to corrosive substances may be a concern.
Lubricity: The black oxide coating reduces friction between the washer and the mating surface, improving the ease of installation and reducing the risk of galling or seizing during tightening.
Aesthetics: The black oxide finish gives the washers a black appearance, which can be visually appealing in certain applications.
DIN 9021 washers with a black oxide finish are commonly used in various industries, including automotive, machinery, construction, and more. They are particularly useful in applications where corrosion resistance, high strength, and an aesthetically pleasing appearance are desired.
When using DIN 9021 washers with a black oxide finish, it's important to follow the appropriate torque specifications and installation guidelines to ensure proper load distribution and reliable fastening.
| 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 |
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