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Typically, using 3/4" (19mm) plywood board is strong enough for this use. And the bolts you want are 3/4" (19mm) plus enough each end to screw into the hold and to accept a nut. Bolts used for mos...
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#1: Attribution notice removed
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System
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2020-05-27T11:08:48Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/14245 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/