Why use Grommets?

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Black Nylon Split Ring Grommet with Retention Shoulders
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Black Nylon Split Ring Grommet with Retention Shoulders

Decoration or Insurance?


People use grommets either as decoration (in wood posts) because they do look good; or as a measure to prevent corrosion with metal posts.

The corrosion problem will arise where the wire passes through a metal intermediate post. The grommet is actually an insulator - preventing a galvanic reaction through dissimilar metals. (if the post is stainless steel - no problem exists).


Black Nylon Split Ring Grommet with Retention Shoulders
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Black Nylon Split Ring Grommet with Retention Shoulders

What about Paint?


Any sort of perfectly applied paint works as well - initially.  Any damage to the paint and subsequent contact between the wire and the posts may well result in corrosion of the wire - which is seen as 'tea staining'. Fittings are not a problem - but the wire has very small spaces in between the wire fibers and these act with a capillary action.  

The capillary action draws the corrosion/liquid/contaminate all along and through the wire resulting in that look like something orange landed on your wire and died... 

Stainless Grommets can be achieved for 3.2mm balustrading by using M6 Stainless Rivet Nuts in the metal posts. These are NOT split ring so they need to be installed BEFORE the wire is run and they need a special tool (see below).  They look very good and work exceptionally well - but they are a tad more expensive.
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