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Thanks all for helping this industrial engineer solve a mechanical problem. The reference info is exactly what I needed. Steve

The arm is attached to the tube with a pin through a welded clevis.

The tube is a rectangular structural tubing open through the middle. In this configuration, water would run right through it. There are no caps. I'm attaching a pdf of a model my CAD guy drafted.http://files.engineering.com/getfile.aspx?folder=2055f2da-e654-4eb0-84ee-e12eeef772fa&file=5376150B.doc

Thank you for the reply. Just for clarification for the maximum stress formula: T = torque applied b = perimeter of section t = ? Do you "fudge" the "3" factor up or down as the wall thickens? I appreciate your help.

How do you calculate the torsion stress in an open ended steel tube that has a torsional load applied? The tubing is 10mm wall x 125mm tall x 100mm wide and the 2500 lb load is applied perpendicular to the tube via a 1495mm long arm.