Aluminum Flat Washers
Standard Round Washers in 2024-T4 Aluminum Alloy
An aluminum, or aluminium, flat washer is a round outer diameter thin plate with a center hole (inner diameter) punched to the size of the bolt or screw diameter.
- Used to distribute fastener pressure evenly
- Can act as a flat surface area for nut or bolt to tighten against
- Washer Specifications may vary +/- .007 depending on production run
- IFI Tolerances Apply
Aluminum flat washers are corrosion resistant, lightweight, and non-magnetic. Our aluminum washers are made of 2024-T4 Aluminum Alloy which is a high strength aluminum alloy with good fatigue resistence and strength-to-weight ratio. Note that, while aluminum 2024-T4 is resistant to atmospheric corrosion, it is not as corrosive resistant as stainless steel and is ill suited for marine enviroments.
Important: We recommend not mixing metals; aluminum fasteners should be used with aluminum fasteners. For more information, please read our article on the subject HERE.
| Flat Washer Sizes | Inner Diameter (ID) | Outer Diameter (OD) | Washer Thickness |
| #6 | 0.149" | 0.375" | 0.031" |
| #8 | 0.174" | 0.375" | 0.031" |
| #10 | 0.203" | 0.437" | 0.031" |
| 1/4" | 0.265" | 0.687" | 0.045" |
| 5/16" | 0.343" | 0.750" | 0.062" |
| 3/8" | 0.406" | 0.875" | 0.062" |
| 1/2" | 0.562" | 1.250" | 0.078" |
| 5/8" | 0.687" | 1.500" | 0.078" |
| 3/4" | 0.812" | 1.875" | 0.091" |
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