Sealing Washer / Bonded Seal (Dowty Washer)
A bonded seal (also called a Dowty washer) consists of a metal washer with an inner ring of rubber vulcanized in place. When compressed by a bolt or fitting, the rubber seals against fluid leakage. Standard hardware in hydraulic and fuel system fittings.
Specifications
| Form | Metal outer washer + bonded inner rubber seal |
|---|---|
| Rubber Compounds | NBR (most common, oil/fuel), FKM/Viton (high temp), EPDM (water/glycol) |
| Size Range | M5 – M52 |
| Material | Carbon steel or Stainless outer washer |
Frequently Asked Questions
What rubber compound should I use for hydraulic oil?
NBR (nitrile rubber) is the standard for petroleum-based hydraulic fluids and is suitable for most general industrial applications. For higher temperatures or aggressive fluids (fuels, solvents, brake fluid), FKM/Viton may be required. Specify the fluid type and temperature when ordering.
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