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I have a 4"x10" wood beam that I want to hang a swing from, but the top of it is not accessible (the roof is above).

Would it be more stable/load bearing to do a shoulder eye bolt with a nut horizontally through the beam, with the load being at 90 degrees, or using an eye bolt from below that's screwed into the wood?

I figured the horizontal lag bolt can have basically arbitrary working load depending on the diameter, but i wasn't sure about what the 90 degree load would do to the beam.

Thanks!

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  • $\begingroup$ You need to provide more information such as the proposed load, type/grade of the wood, span length, and how it is supported. Note this forum is meant to provide answers to the conceptual questions on engineering, not to offer solutions. $\endgroup$
    – r13
    Oct 22 '21 at 0:11
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I would use a 1/8 x 4 x 10-inch plate on each side with a proper pre-drilled hole on it for your eye bolt with four 1/4 inch bolts on each corner.

A swing not supported by a plate will eventually split the beam. Hanging them to the bottom of the beam has its own risks of failure.

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