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Lacking specs

  • norwegr Saturday, April 15, 2017 4:52 AM Reply

    What hole diameter is the grommet made for, and what is the maximum cable diameter?

    The description says:


    Inner Hole Diameter: 3mm/0.12"
    Outsider Diameter: 7mm/0.3"
    Groove Width: 1mm/0.04"


    This looks to be a grommet for protecting a cable going through sheet metal, like a firewall as mentioned in the text (although you would want anything going through a firewall to be waterproof, meaning a grommet is not the right thing). For a grommet, you need to know which diameter hole it is made for, and what is the maximum thickness (of a cable) you can run through it.

    With the specs given here, it looks like the hole in the middle is 3 mm, and that the outside diameter of the rubber is 7 mm. That means that the grommet is made for a hole which is somewhere between those two values, maybe. Or is it the hole diameter which is 7 mm?  Hard to say when the description is so lacking. Why not have a drawing with the actual measurements shown, on technical items like this?

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  • ozOzo Top 10 Forum Poster Sunday, April 16, 2017 8:17 AM Reply

    Well two out of threee aint bad. At least we know that cable with 3mm OD insulation will be a firm fit and the grommet will be a snug fit in 1mm thick metal but we don't know which drill to use to make the hole through that metal. The 7mm they call "Outsider Diameter" is a nonsense. It's too small to be outsider der grommet and too big to be outsider der hole.

    It is impossible to scale which it is supposed to be because the photographer stuffed up (again!). The grommets in photo #1 are nothing like the proportions of those in photos #2, 3 and 4, i.e. the inner diameter to overall diameter ratio. I'd say a 6mm drill would be about right. 

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  • gasbag11 Top 10 Forum Poster Sunday, April 16, 2017 10:48 PM Reply

    It's too small to be outsider der grommet and too big to be outsider der hole.

    Uhh... what? I never heard Crocodile Dundee talk like that.   

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