4 inch light holes

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by GliderKitTrucker, Feb 10, 2021.

  1. GliderKitTrucker

    GliderKitTrucker Bobtail Member

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    I’m wanting to add Some 4 inch lights on the back of my trailer, anybody know what size hole you still. Is it 4 3/16?
     
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  3. CropShop

    CropShop Bobtail Member

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    Mar 24, 2020
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    I would suggest using a 4"? holesaw or whatever size and practicing in something like luwan or thin poly or scrap metal before doing the real ones. I have done some already, but I forget the real size.
     
  4. BoxCarKidd

    BoxCarKidd Road Train Member

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    Buy bolt on bracket for that light. Use it for a template. If the metal is thicker the hole has to be larger.
     
    Goodysnap Thanks this.
  5. Banker

    Banker Road Train Member

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    This is the hole saw I use. 7B93F574-C4DA-4B69-BC35-9409244BC305.png
     
  6. lester

    lester Road Train Member

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    I was gonna say I'm pretty sure its 4.5inch. I'll have to check for sure when I get back to the shop
     
  7. GliderKitTrucker

    GliderKitTrucker Bobtail Member

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    Dec 28, 2019
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    Yeah it’s 4.5 for the lights and grommets I’m using. I didn’t think they had to be that big but they are.
     
  8. Motor Trucking

    Motor Trucking Bobtail Member

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    Dec 5, 2018
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    Driver,I just installed xtra lights in the back of my cab(aluminum)I used a 4 3/8 and they were a little bit too tight, One thing for sure,I won't be losing them anytime soon! Lots of spray silicone on the lights to get them to seat well! If I had to do over,believe I would make the holes with a 4 7/16.No believing about it,I would definitely!
     
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