Bonded Seals | Dowty Washers

Bonded seals are static seals that are used to seal bolt heads, nuts and screw and flange connections. They consist of a flat metal ring (steel, stainless steel or aluminum) and elastic rubber on the inside (NBR, HNBR, FKM, EPDM).

Advantages Bonded Seal

  1. Reliable sealing at high and low pressure
  2. Easy to use, metal/steel ring prevents over-compression
  3. Low bolt torque in comparison to fully metallic seals



The most common bonded seal. Bonded seals are primarily used to replace copper joint rings in high pressure applications. The steel ring prevents over compression and extrusion. The elastomeric part allows reliable sealing for both high and low pressure operation. Unlike copper joint rings, bonded seals can be re-used after assembly.


The self centering bonded seal profile eliminates sealing offset and allows easy installation. Self centering bonded seals can be pre-assembled.

Related Metallic Seals

Metal Sealing Rings

Metallic seals are designed to make a seal by means of a ‘first line contact’ between the counter face and the packing.



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