An O-ring, also known as a packing, or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. The O-ring may be used in static applications or in dynamic applica...
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http://en.wikipedia.org/wiki/O-ring
a circular seal common in the oilfield; requires deformation (squeeze) to energize and seal.
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http://www.encyclo.co.uk/visitor-contributions.php
This round rubber washer is compressed to make a watertight seal - often found in mixer taps and in waste pipe fittings.
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http://www.homeserve.com/emergency-repairs/plumbing/glossary
a ring made of neoprene that is used to provide a positive seal. It usually fits into a groove slightly shallower than O-ring, and mated against a flat surface to provide a seal for oil, fuel, or air.
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http://www.horizonsunlimited.com/gear-up/motorcycle-terms-and-glossary
[
n] - a gasket consisting of a flat ring of rubber or plastic
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http://www.webdictionary.co.uk/definition.php?query=O%20ring
a loop of elastomer, designed to be placed in a groove and compressed between two or more parts, with an aim to create a seal at the contact surfaces.
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https://dipndive.com/blogs/stories/diving-lingo-101-glossary-of-terms-phras
a ring used as a gasket.
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https://modernplastics.com/technical-resources/plastics-glossary-of-terms/
A flexible 'O' shaped seal.
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
noun a gasket consisting of a flat ring of rubber or plastic; used to seal a joint against high pressure
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https://www.encyclo.co.uk/local/20974
Used as a gasket to seal the flashlight case against dust and moisture.
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https://www.encyclo.co.uk/local/21137
A circular gasket, usually made of rubber. O-rings come in different shapes and sizes. On soda kegs, they are used to ensure a gas-tight seal on the main lid, the liquid and gas fittings, and between the dip tubes and the keg body. O-rings will eventually deteriorate, and must be replaced occasionally.
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https://www.encyclo.co.uk/local/22622
a ring of pliable material, as rubber or neoprene, used as a gasket: the failure of an O-ring caused the explosion that destroyed the space shuttle Challenger in 1986.
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https://www.infoplease.com/dictionary/o-ring
Often made of rubber, these doughnut-shaped rings are used in various pieces of scuba gear to prevent air or water from getting in or out of that piece of gear.
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https://www.scubadiving.com/dive-speak-learn-scuba-diving-terms-phrases-and
a ring used as a gasket.
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https://www.usplastic.com/knowledgebase/article.aspx?contentkey=784
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