Hole in tank too small for 5/16" bolt

Discussion in 'Toilet Forum discussions' started by marcusd, Jan 29, 2008.

  1. marcusd

    marcusd New Member

    Jan 29, 2008
    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. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    They come in 1/4" too, if that helps.
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  4. Herk

    Herk Plumber

    Oct 28, 2007
    S.E. Idaho
    American Standard uses flimsy little bolts if you can find some.
  5. toolaholic

    toolaholic General Contractor Carpenter

    Jul 16, 2005
    Repairing and remodeling homes
    Marin Co. Ca.
    Use a stainless washer over the leaky new one
  6. Bob NH

    Bob NH In the Trades

    Oct 20, 2005
    New Hampshire
    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.
  7. Lakee911

    Lakee911 I&C Engineer (mostly WWTP)

    Aug 23, 2005
    I&C Engineer (mostly WWTP)
    Columbus, OH
    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.
  8. Redwood

    Redwood Master Plumber

    Dec 15, 2007
    Service Plumber
    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!:mad:
  9. Mikey

    Mikey Aspiring Old Fart, EE, computer & networking geek

    Nov 8, 2005
    Hansville, Washington
    Any decent hardware store will carry 1/4" brass round-head screws and nuts to match, SS washers, etc.
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