Karl Townsend wrote:
"Jon Danniken" wrote:

I am wondering if I need to use an internal reinforcement cylinder
inside of a section of steel square tubing. The square tubing in
question is 2.5", with a wall thickness of 3/16". The fastener will be a
9/16"
Grade 8 bolt, with a through hole of 5/8".

I will also have a 1/4" section of plate outside of each side of the
steel square tubing, with a width spanning the full distance of the
flat side of the square tubing, from shoulder to shoulder (about
1.75" x 1.75"). Will I need to insert a piece of pipe inside of the steel
square
tubing to keep it from collapsing, or will the 1/4" plate on the
outsides spread the load sufficiently?


your design looks good to me. I do it that way all the time.

Thanks Karl, that will save me a lot of trouble.

Jon