Flat Washers Aluminum

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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Product Specifications
System of Measurement (Unit)
Tolerance (IFI)
Actual measurements may vary slightly +/- depending on production run within IFI Tolerances