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{{short description|Type of washer used to create a seal around a screw or bolt}}
[[File:New Bonded Washer WIKIPEDIA DWG.png|thumb|A bonded seal commonly seals between bolt head and body.]]
[[File:New Bonded Washer WIKIPEDIA DWG.png|thumb|A bonded seal commonly seals between bolt head and body.]]
A '''bonded seal''' is a type of [[Washer (hardware)|washer]] used to provide a [[mechanical seal|seal]] around a screw or bolt. Originally made by Dowty Group, they are also known as Dowty seals or Dowty washers.<ref>{{cite web|url=http://www.potterassoc.com/pdf/bonded_seal_information_and_sizing_chart.pdf|title=The Dowty Bonded Seal|accessdate=12 August 2016}}</ref> Now widely manufactured, they are available in a range of standard sizes and materials <ref>{{cite web|url=http://www.ashtonseals.com/bonded-seals.asp|title=Bonded Seals from Ashton Seals|accessdate=12 August 2016}}</ref><ref>{{cite web|url=http://www.easternseals.co.uk/products/bonded-seals/|title=Bonded Seals from Eastern Seals|accessdate=12 August 2016}}</ref><ref>{{cite web|url=http://supaseal.co.uk/datasheets/bonded_seals.pdf|title=Bonded Seals from Supaseal|accessdate=12 August 2016}}</ref>


In [[mechanical engineering]], a '''bonded seal''' is a type of [[Washer (hardware)|washer]] used to provide a [[mechanical seal|seal]] around a [[screw]] or [[Bolt (fastener)|bolt]]. Originally made by Dowty Group, they are also known as Dowty seals or Dowty washers.<ref>{{cite web|url=http://www.potterassoc.com/pdf/bonded_seal_information_and_sizing_chart.pdf|title=The Dowty Bonded Seal|accessdate=12 August 2016}}</ref> Now widely manufactured, they are available in a range of standard sizes and materials <ref>{{cite web|url=http://www.ashtonseals.com/bonded-seals.asp|title=Bonded Seals from Ashton Seals|accessdate=12 August 2016}}</ref><ref>{{cite web|url=http://www.easternseals.co.uk/products/bonded-seals/|title=Bonded Seals from Eastern Seals|accessdate=12 August 2016}}</ref><ref>{{cite web|url=http://supaseal.co.uk/datasheets/bonded_seals.pdf|title=Bonded Seals from Supaseal|accessdate=12 August 2016}}</ref>
Dowty Seal taken over by Trelleborg sealing solutions. Bonded Seals are made by Trelleborg in the United Kingdom to the original specification. O Rings Limited are the UK Partner distributor for Trelleborg


A bonded seal consists of an outer annular ring of a hard material, typically steel, and an inner annular ring of an [[Elastomer|elastomeric material]] that acts as a [[gasket]]. It is the compression of the elastomeric part between the faces of the parts on either side of the bonded seal that provides the sealing action. The elastomeric material, typically nitrile rubber, 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 bonded seal 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-ring]]s. Some designs come with an additional flap of rubber on the internal diameter to locate the bonded seal at the centre of the hole, these are called self-centring bonded washers<ref>{{Cite web|url=http://www.sealingaustralia.com.au/bonded-washers|title=Bonded Washers from Sealing Australia|last=|first=|date=|website=|publisher=|access-date=}}</ref>
A bonded seal consists of an outer [[Annulus (mathematics)|annular ring]] of a hard material, typically steel, and an inner annular ring of an [[Elastomer|elastomeric material]] that acts as a [[gasket]]. It is the compression of the elastomeric part between the faces of the parts on either side of the bonded seal that provides the sealing action. The elastomeric material, typically [[nitrile rubber]], 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 bonded seal 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-ring]]s. Some designs come with an additional flap of rubber on the internal diameter to locate the bonded seal at the centre of the hole; these are called self-centring bonded washers.<ref>{{Cite web|url=https://www.sndseals.com/en/series/5/bonded-seals-dowty-washers-usit-rings|title=Bonded Seals, Dowty Washers from SND Seals}}</ref><ref>{{Cite web|url=http://www.sealingaustralia.com.au/bonded-washers|title=Bonded Washers from Sealing Australia|last=|first=|date=30 January 2014|website=|publisher=|access-date=}}</ref>


==References==
==References==
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{{Mech-engineering-stub}}
{{Mech-engineering-stub}}
[https://www.oringslimited.co.uk/ O Rings Limited are the UK Partner distributor for Trelleborg]

Latest revision as of 12:57, 4 August 2023

A bonded seal commonly seals between bolt head and body.

In mechanical engineering, a bonded seal is a type of washer used to provide a seal around a screw or bolt. Originally made by Dowty Group, they are also known as Dowty seals or Dowty washers.[1] Now widely manufactured, they are available in a range of standard sizes and materials [2][3][4]

A bonded seal consists of an outer annular ring of a hard material, typically steel, and an inner annular ring of an elastomeric material that acts as a gasket. It is the compression of the elastomeric part between the faces of the parts on either side of the bonded seal that provides the sealing action. The elastomeric material, typically nitrile rubber, 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 bonded seal 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 bonded seal at the centre of the hole; these are called self-centring bonded washers.[5][6]

References

[edit]
  1. ^ "The Dowty Bonded Seal" (PDF). Retrieved 12 August 2016.
  2. ^ "Bonded Seals from Ashton Seals". Retrieved 12 August 2016.
  3. ^ "Bonded Seals from Eastern Seals". Retrieved 12 August 2016.
  4. ^ "Bonded Seals from Supaseal" (PDF). Retrieved 12 August 2016.
  5. ^ "Bonded Seals, Dowty Washers from SND Seals".
  6. ^ "Bonded Washers from Sealing Australia". 30 January 2014.