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Thread: Size hole for 3/8" bolt?

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    Nightstorm's Avatar
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    Size hole for 3/8" bolt?

    That's a fundamental question, I'm sure. I drilled a 3/8" hole and hammered a 3/8 bolt through, but it was tough. Can I just drill a 1/2" hole and put the bolt through that, using a washer on the nut side? Or would that be too loose and defeat the purpose?

    For context, this is for the construction of a 4' x 4' x 8' QT. Thanks!



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    Look at a ruler and compare 3/8 (6/16) to a 1/2 inch (8/16). I would try drilling 7/16. The 1/2 inch might be a tad big.
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    Try a 13/32 drill? In wood I guess I'd opt for the snug fit.

    Bill

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    Quote Originally Posted by BillJ View Post
    Try a 13/32 drill? In wood I guess I'd opt for the snug fit.

    Bill
    Bill - you have 13/32 ? I probably do, but that's really cutting it close. Part of the tight fit and need to hammer it through could be alignment of the two pieces.
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    I don't have a 13/32, do they make one???? I would go with 7/16


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    Well, I was able to find a 13/32 at HD. I think this should be fine, since my test hole was just 3/8, and I was able to knock the bolt through with a block of wood. I'll let you know if that doesn't work. Thanks!



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    would use washers regardless of what ya end up doing. wood is soft material. and is not rock. and after some time. the bolt head and nut will most likely start sinking in on there own into the wood, from the pure weight and pressure of water pressuing on everything.

    the washers will help keep the nuts and bolts from sinking into the wood and give a much stronger doing. more so when ya go to tighten up the bolt / nut. just tighting can easly cause a bolt or not to sink completely in. and in some cases could sink in far enough to actually split the wood.... heck just using a cheap battery drill to tighten things up. i can easly partially sink washers into most woods.

    a hammer is always nice to have handy as well once ya get drill bit size figured out. and just being able to tap a bolt through if need be.
    Last edited by boggen; 01-14-2008 at 02:12 PM.
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    When I built my 4x4x2.5 QT wooden tank using 2x4s, I used 1/2 drill bit for 3/8 bolts with washer. No problem.

    Yen

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    I countersink the depth of the bolt head/washer with a 1.125 spade bit and then drill a 13/32" hole for the 3/8" bolts. Be careful forcing a bolt thru a hole in wood..... you may increase the pressure on a flaw in the wood.
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    drilling

    As a general rule, drill 1/16th inch over the size of a bolt for wood, 1/32-1/64 for metal.
    always use washers. nyloc nuts are useful but can get expensive. all outdoor wood bolt applications use Locktite threadlocker.
    Robert
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    Quote Originally Posted by boggen View Post
    would use washers regardless of what ya end up doing. wood is soft material. and is not rock. and after some time. the bolt head and nut will most likely start sinking in on there own into the wood, from the pure weight and pressure of water pressuing on everything.

    the washers will help keep the nuts and bolts from sinking into the wood and give a much stronger doing. more so when ya go to tighten up the bolt / nut. just tighting can easly cause a bolt or not to sink completely in. and in some cases could sink in far enough to actually split the wood.... heck just using a cheap battery drill to tighten things up. i can easly partially sink washers into most woods.

    a hammer is always nice to have handy as well once ya get drill bit size figured out. and just being able to tap a bolt through if need be.

    Just thought I'd add to that I'd use large(outside diameter),thick washers. Just small enough inside diameter to easily slide on but no bigger.

    Bill

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    Quote Originally Posted by shizuka View Post
    As a general rule, drill 1/16th inch over the size of a bolt for wood, 1/32-1/64 for metal.
    always use washers. .....Robert
    Quote Originally Posted by BillJ View Post
    Just thought I'd add to that I'd use large(outside diameter),thick washers. Just small enough inside diameter to easily slide on but no bigger.
    Bill

    Ditto..Ditto

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