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Leaking hydraulic sealing copper or aluminum washer? Can’t get it to seal? Use a dowty (bonded washer).

January 17, 2021

Most automotive hydraulic applications use a copper or aluminum washer for sealing. The idea is that the two surfaces are near perfectly flat and all that is needed is a hint of squished copper or aluminum.

A small gouge, unevenness, or slop in the mounting threads can mean the squish of a copper or aluminum washer may not be enough.

So what is one to do?

Dowty seals, also known as bonded washers. The washer is made of carbon steel with a self centering washer made of Nitrile (NBR), Viton (FKM, FPM), or EPDM.

They can handle operating pressures of up to 20,000 PSI which generally covers all automotive use cases.


They are also included in some aftermarket kits:



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