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Thread: Hole in tank too small for 5/16" bolt

  1. #1

    Default Hole in tank too small for 5/16" bolt

    I'm looking for a smaller diameter brass bolt for the bowl-to-tank connection. One hole accepts the new 5/16" bolt just fine, but the other hole is too small. The old hardware is smaller diameter but its really corroded and I would like to replace it.

    I can't seem to find a bolt with a large enough flat head on it to get a good seal with the rubber washer. I've tried using a stainless washer on top of the rubber washer but water get in between the bolt head and the steel washer. I could use another rubber washer in that joint, or maybe JB weld the steel interface.... Well you see where this is going.

    Any advice where I can get the right size bolt?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Default

    They come in 1/4" too, if that helps.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3

    Default

    American Standard uses flimsy little bolts if you can find some.

  4. #4
    General Contractor Carpenter toolaholic's Avatar
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    Lightbulb

    Use a stainless washer over the leaky new one

  5. #5
    In the Trades Bob NH's Avatar
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    You can probably enlarge the hole slightly with a Dremel tool and a silicon carbide or diamond grinding bit. Use a bit that is too small to fill the hole so you can't wedge it in.

  6. #6
    I&C Engineer (mostly WWTP) Lakee911's Avatar
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    Any chance the hole has calcium or mineral deposits around it making it smaller? I'd try a small file or something to clean it.

  7. #7
    Master Plumber Redwood's Avatar
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    No its a Central Am. Std. Toilet that came with those cheesy 1/4" zinc plated steel bolts....
    Hecho en Guatamala we have outsourced toilet manufacturing to a contry where most of the population doesn't have one!

  8. #8
    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
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    Any decent hardware store will carry 1/4" brass round-head screws and nuts to match, SS washers, etc.

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