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  1. #1
    Veteran Member
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    Jul 2004
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    1,822
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    Bancroft, Ontario
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    JD4300

    Default How big a hole do I need?

    I finally got fed up with repairing/replacing the lights on my little ATV trailer and am switching to the sealed units that they use in the bigger 18wheeler trailers. These fit into a rubber grommet that goes into a round hole. But how big is the round hole? My BIL had used them on a custom bumper on his truck but the shop doing the work cut his holes too big and now his lights fall out every now and then. The grommet stretches and distorts when it is over the light so I don't trust the measurement I get that way. Does anyone know the correct size hole to cut in my fender? I'd sooner just cut it once... :-)

  2. #2
    Veteran Member BTDT's Avatar
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    Sep 2006
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    2,209
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    North Texas
    Tractor
    IH M Farmall-propane powered, H Farmall (father-in-laws), Ford 1300 diesel

    Default Re: How big a hole do I need?

    I would think there should be some paperwork with the light that would have that information. What kind of light is it? Look up the manufacturers website, they will probably be able to help. Or, measure your BIL's, and start yours smaller, see if you like the fit, if not, then adjust. Keep adjusting till your happy.
    Praise is not something you do to get closer to God, praise is a response to God being close to you.

  3. #3
    Super Member
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    Feb 2006
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    6,138
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    East PA or 750 mi. east of a short man named Dar___
    Tractor
    Kubota, AGCO, New Holland LB

    Default Re: How big a hole do I need?

    Quote Originally Posted by pat32rf
    I finally got fed up with repairing/replacing the lights on my little ATV trailer and am switching to the sealed units that they use in the bigger 18wheeler trailers. These fit into a rubber grommet that goes into a round hole. But how big is the round hole? My BIL had used them on a custom bumper on his truck but the shop doing the work cut his holes too big and now his lights fall out every now and then. The grommet stretches and distorts when it is over the light so I don't trust the measurement I get that way. Does anyone know the correct size hole to cut in my fender? I'd sooner just cut it once... :-)
    Been there done that. I'm assuming you have a set of hole saws.....just take a thin piece of scrap metal, or some thin plywood or masonite and try a couple test holes, then see which ones fit your lights the best.

    You can't start small and go bigger. A hole saw needs the middle left intact so the pilot drill has something to drill into.

  4. #4
    Elite Member
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    Jul 2006
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    4,409
    Location
    Northwest, WA

    Default Re: How big a hole do I need?

    Sealed are nice but the LED type will last much much longer.

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  5. #5
    Platinum Member
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    Aug 2005
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    581
    Location
    Sedro Woolley, WA
    Tractor
    Kubota L3400 (gear driven)

    Default Re: How big a hole do I need?

    Quote Originally Posted by Builder
    You can't start small and go bigger. A hole saw needs the middle left intact so the pilot drill has something to drill into.
    Actually, there is a hole saw arbor that lets you stack two hole saws so you can cut a larger hole. I have one of these and use it quite a bit. You can see it here.

  6. #6
    Super Member
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    Feb 2006
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    East PA or 750 mi. east of a short man named Dar___
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    Kubota, AGCO, New Holland LB

    Default Re: How big a hole do I need?

    Cute!

    But I still think it's more wise to know the hole size by drilling into scrap before drilling your expensive sheetmetal fenders, don't you?

  7. #7
    Veteran Member
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    Nov 2003
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    1,347
    Location
    Tombstone Az
    Tractor
    KIOTI LK30

    Default Re: How big a hole do I need?

    If they are not the LED ones you will be worse off than before. I got those things on one of my horse trailers and just hate them. You can not relace the bulbs individually so if the running light or brake light goes out you got to replace the whole thing at about $8 a pop.

  8. #8
    Silver Member wolfpack2's Avatar
    Join Date
    Dec 2004
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    191
    Location
    SE Michigan
    Tractor
    JD 4520

    Default Re: How big a hole do I need?

    A standard 4" truck light uses a 4.5" hole with a grommet mount.

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  9. #9
    Platinum Member
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    Aug 2005
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    Sedro Woolley, WA
    Tractor
    Kubota L3400 (gear driven)

    Default Re: How big a hole do I need?

    Quote Originally Posted by Builder
    But I still think it's more wise to know the hole size by drilling into scrap before drilling your expensive sheetmetal fenders, don't you?
    I agree that it's better to cut the hole once. My point was that there is a device to help fix mistakes or to enlarge an existing hole. I work on boats and I'm pulling out old thruhulls to put in larger ones and use that little arbor quite a bit. Works like a charm.

  10. #10
    Super Member
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    Feb 2006
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    East PA or 750 mi. east of a short man named Dar___
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    Default Re: How big a hole do I need?

    Quote Originally Posted by Shimon
    I agree that it's better to cut the hole once. My point was that there is a device to help fix mistakes or to enlarge an existing hole. I work on boats and I'm pulling out old thruhulls to put in larger ones and use that little arbor quite a bit. Works like a charm.
    Oh, I hope you didn't take me the wrong way. That double hole saw is cool. I might get one.

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