A cable grommet is a tube or ring through which an electrical cable passes. They are usually made of rubber or metal.[1]
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The grommet is usually inserted in holes in certain materials in order to protect, improve friction or seal cables passing through it, from a possible mechanical or chemical attack.
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A grommet can be used in furniture to protect wires, cables or cords for computer equipment or other electronic equipment in homes or offices. At the same time, they are used decoratively to embellish the furniture and can be bought in a large variety of sizes, colors and finishes.
The grommets usually consist of two pieces: A liner that goes into the hole of the furniture and a cap with a hole (often adjustable in size) for the cables to go through.
When there is no need to use them they can be blanked either by turning one piece 90° against the other or by inserting an extra plastic piece designed to fit that purpose.
Rubber grommets "anti-microphonism"[
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A rubber grommet is made of a resilient material (typically rubber), with the molding designed to hold it in place, so as to help to absorb vibrations, for example, between a tandem radio and the chassis or between microphone and its tripod, keeping the two components "floating" mechanically decoupled one from another to prevent a characteristic coupling called microphonism .
For more information, please visit Rubber Bellows.
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Rubber grommets are available in several different types. Here are the principal ones:
Rubber blanking plugs are used to seal holes and are designed to hold and control pressure coming from above or below, making them a good grommet choice for high-pressure UK devices and tubing.
Some feature a small hole into which a wire can be inserted for a firm hold. These are called diaphragm grommets.
Open rubber grommets are the most basic design, featuring a central hole. They are used to protect cables and pipes when they pass through holes in metal plating.
Also known as blind rubber grommets, closed grommets provide air-tight seals when applied, and can be a good choice for sealing holes not currently in use to prevent the build-up of dust.
Unlike similarly shaped round grommets, blind rubber grommets have no central hole. They are widely used by the UK electronics industry.
A further variant is the semi-blind grommet. These feature a central membrane that is thin enough to be pierced by wires or cables. This means that semi-blind grommets can take the place of both open and closed grommets.