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This is one of those questions that no one will will tackle because there are other factors that weigh into this type construction: Angle of lift, How will the new beam be supported, Is the foundation sufficent, indoors vs outdoor ect. Your safety is important, and you would be better served to discuss your needs with a engineer that can look at the whole picture.

I built a overhead crane once with a 40' span once and I can tell you from experience you will not find a beam straight enough as delivered. It will have to be proffessionaly straightened. Mine was a 24 x 100# I-beam and it had a 18" bow that had to be corrected.

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9y ago
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6mo ago

To span 40 feet with a capacity of 1000 pounds in the middle, you would need to consider various factors, such as the material of the beam and the desired safety factor. Generally, a W18x55 or W21x55 steel I-beam could be suitable for this application. However, it is recommended to consult with a structural engineer for a precise assessment based on the specific loading conditions and design requirements.

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Q: What size you i beam can safely span 40 feet with 1000lb capacity in the middle?
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