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Bonded seal is a type of washer used to provide a seal around a screw or bolt.
Bonded seal gasket consists of an outer annular ring of a hard material, typically steel, and an inner annular ring of an elastomer material that acts as a gasket. It is the compression of the elastomer part between the faces of the parts on either side of the bonded seal that provides the sealing action. The elastomer material, typically NBR, is bonded by heat and pressure to the outer ring, which holds it in place. This structure increases resistance to bursting, increasing the pressure rating of the seal. Because the combined sealing gasket itself acts to retain the gasket material, there is no need for the parts to be sealed to be shaped to retain the gasket. This results in simplified machining and greater ease of use as compared to some other seals, such as O-rings. Some designs come with an additional flap of rubber on the internal diameter to locate the USIT ring at the centre of the hole; these are called self-centring USIT ring.
NQKSF offers an extensive range of standard and custom wind bonded seals. Please refer to our sizing charts for dimensions.
