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I use 3/4" A325 Type 1 structural bolts. The allowable shear strength in single shear is 7500 lbs for a slip critical connection. In double shear its 15000 lbs. This goes up if you choose to do a bearing type connection. For the application I use them in the threads will withstand 1000 lbs per bolt, so for example my 8'er has 10 screw legs each withstanding 1000 lbs totaling 10k lbs. Then I weld a 1/4" x 4" round plate to distribute some more of the down force.
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