Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Standard flat washers leave a raised, unfinished look around countersunk screws — a real problem when you want a flush, professional finish on aluminum bicycle frames, RC builds, or custom electronics enclosures. These anodized aluminum countersunk (cup) washers are designed to sit flush against the surface, creating a clean, finished appearance around countersunk fasteners.
Machined from high-strength, heat-treatable aluminum alloy and finished with a durable anodized coating, each washer features a countersunk profile that mates cleanly with flat-head and countersunk screws. Available in M4, M5, M6, M8, M10, and M12 thread sizes and 10 anodized colors — Dark Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, and Orange — manufactured to a ±0.3mm tolerance.
These countersunk washers are ideal for high-end aluminum bicycle frame assembly, drone and RC model builds, aerospace model accessories, computer case modding, golf equipment, mold tooling fixtures, and any precision project where a flush, color-matched fastener finish is required.
Ideal for high-end aluminum alloy bicycle frame assembly where a flush, color-matched fastener finish and lightweight hardware are equally important.
The lightweight aluminum construction and flush-fit profile make these washers a natural fit for RC aircraft, drone frames, and aerospace model toy accessories.
Add a pop of color and a clean flush finish to custom computer cases, cooling systems, and electronics enclosures with anodized countersunk washers that complement your build’s color scheme.
Suitable for golf equipment, mold processing, mechanical equipment assembly, and any project requiring corrosion-resistant, lightweight washers with a clean countersunk finish.
| Material | Aluminum Alloy (High Strength, Heat Treatable) |
|---|---|
| Type | Countersunk Washer (Cup Washer) |
| Available Thread Sizes | M4, M5, M6, M8, M10, M12 |
| Surface Treatment | Anodized |
| Available Colors | Dark Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, Orange |
| Tolerance | ±0.3mm |
| Key Properties | High strength, good mechanical performance, easy to process, wear resistant, corrosion resistant, oxidation resistant |
These washers are machined from high-strength, heat-treatable aluminum alloy and finished with an anodized coating. The anodized surface provides a hard, color-fast layer that resists corrosion, scratching, and oxidation.
Thread sizes available are M4, M5, M6, M8, M10, and M12. Colors available are Dark Red, Rose Red, Golden, Royal Blue, Sky Blue, Black, Silver, Green, Purple, and Orange. Select your preferred Color and Size (Thread Diameter) combination from the variant options above.
These are countersunk (cup) washers designed to work with flat-head and countersunk screws. The countersunk profile allows the washer to seat flush against the workpiece surface, creating a clean, finished appearance around the fastener head.
The anodized aluminum construction offers good corrosion and oxidation resistance, making these washers suitable for light outdoor use. For environments with constant salt spray or harsh chemicals, stainless steel hardware is generally recommended instead.
The anodized finish is integrated into the surface of the aluminum rather than applied as a paint or coating, which means it is generally more resistant to fading and chipping than painted alternatives under normal use conditions.
These washers are manufactured to a tolerance of ±0.3mm, ensuring consistent dimensions and reliable seating with standard M4–M12 countersunk screws and bolts.
Yes, these aluminum countersunk washers are compatible with standard metric steel screws in M4–M12 sizes. Keep in mind that aluminum is softer than steel, so they are best suited for applications where load levels are within the alloy’s mechanical limits. Avoid over-torquing to prevent deformation.
