novice question about toilet tank bolts/hardware

Discussion in 'Toilet Forum discussions' started by cjs1996, Dec 24, 2006.

  1. cjs1996

    cjs1996 New Member

    Nov 29, 2006

    I've got an older Crane toilet and the tank rocks slightly (no leaks though), I can see that one of the tank bolts is loose. Instead of just cranking the nuts down, I was thinking about going ahead and replacing the tank to bowl gasket, as well as the tank bolt hardware, and giving everything a good cleaning with the tank off.

    My question is about the tank bolts: Should there be two nuts on each tank bolt, or is one sufficient?

    The reason I ask is because I just installed a Toto Drake in another bathroom, and there were 2 nuts for each tank bolt, so it went like this (from top to bottom):

    tank bolt head
    rubber washer
    bottom of tank
    regular washer
    nut (#1)
    regular washer
    nut (#2)

    So I actually tightened the first washer & nut (#1) onto the tank which compressed the rubber washer before I even sat the tank on the bowl. Once I sat the tank on the bowl then I installed the second washer and nut (#2) which held the tank in place.

    (BTW - I notice that the Drake manual on this website differs from mine in that it doesn't show this second set nut on each bolt.. not sure why)

    My existing Crane toilet only has one nut on each bolt:

    tank bolt head
    rubber washer
    bottom of tank
    regular washer

    Is this standard? Seems to me that the additional nut between the tank and bowl would be less likely to leak, since even if the bottom nut works loose, the rubber washer is still held tight.

    Is one way better than the other? Should I look for a tank bolt kit with 2 sets of washers nuts on each bolt? Or does it even matter?

  2. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego, CA
    It seems that many of us prefer the your method number 1. The nut on the underside of the tank can safely be snugged up to ensure a good squeeze on the bolt washer. If the only nut is on the underside of the bowl top, it is hard to tighten that sufficiently, although it is often done, especially seen on older toilets, apparently with success.

    Last edited by a moderator: Aug 12, 2016
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  4. plumber1

    plumber1 Plumber

    Aug 7, 2005
    I strongly agree.
  5. shacko

    shacko Master Plumber-Gas Fitter

    Jan 22, 2006
    Master Plumber-Gas Fitter
    Rosedale, Md
    tank bolts

    You have to go with the manufactors installation unless you find that something won't work, they are not the same. Luck.

    "If all else fails, read the directions"
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