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Dielectric Washers and Gaskets — image 1
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Dielectric Washers and Gaskets

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Easy way to minimize galvanic corrosion for fasteners.

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Creative Commons — Public Domain

Great for separating titanium screws from aluminum and stainless steel surfaces.

Requires minimum material, doesn't stick out from underneath the cap, doesn't add too much elevation to the screw.  Can be used as regular washers if scaled up on the Z axis.

Printing

Avoid using filaments that contain metals or carbon fiber (yes, CF is conductive, it's susceptible to galvanic corrosion when in contact with metals).  Anything rigid should be good.

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