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Given two 4x4's with a 1/2" steel pipe running through the middle, how much weight can the posts support? Is there a chance the wood will split?

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    What's the intent? A jungle gym or pull-up bar? Something like that? – represton May 8 '20 at 15:00
  • How tall are the posts? Are they on a concrete foundation or just a hole in the ground? – represton May 8 '20 at 15:07
  • The posts will probably support more than the pipe will, assuming they're secured as to be immovable. But yes, there's a chance. Quality and condition matter, as does specific loading. – isherwood May 8 '20 at 15:15
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    And rather than asking such a specific engineering question, you should ask whether the intended purpose will be achieved. Edit to describe your project. – isherwood May 8 '20 at 15:16
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    Chin up bar? The only issue that you'll have it keeping the posts upright. Make sure that they are buried in the ground well – Ack May 8 '20 at 17:12
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Axial compressive strength of a worst-case 4x4 post exceeds 3,000 lbs., could be as high as 13,000 lbs, depending on the height and type of wood. Yes, the wood can possibly split, but that's always a risk with wood. As mentioned, the pipe is likely the weakest link here, but we still don't know your purpose so this is all still theoretical.

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Guessing you intend it for a pull-up bar. That 1/2 will easily hold 400 lbs, possibly not at one point but at one time, I weighed almost that much and ma and my son were doing pull-ups, he said I made the posts wobble but the bar is still there 20 years later.

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