How is this piece connected here?

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Trying to replicate this pull up bar for a friend of mine.I came up with my own design but this would be less work. I just don't see where the bolt on the top attached to unless it's just tapped into the tubing?Attachment 1074761Attachment 1074771www.FirehouseFabricators.comZachLincoln 210mpLincoln SW200Hypertherm Powermax 45xp2x4 CNC Plasma Table.
Reply:Tapping the tubing would work only if its thick enough. Drill a hole and weld in a recessed nut would work.Last edited by Sandy; 04-12-2015 at 12:43 PM."The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life." -Theodore Roosevelt
Reply:Drill a hole larger than the nut through the bottom so you can get a socket in there vertically to tighten it.
Reply:nutsert?i.u.o.e. # 15queens, ny and sunny fla
Reply:The example pictured appears rather flimsy...I understand it needs to be constructed so guy can take apart and store, transport easy, right?To make top mobetter, I would use two 8" lengths of the larger square tube at top where pipe meets tubing....maybe I can describe my idea.I would weld the tubing to each end of the pipe in a tee fashinon with several inches of tubing extending above and below cross pipe....then slip assembly over smaller tube uprights and pin or bolt them......In fact, you could make whole up rights out of tubing smaller than the short pieces used at end of pipes and simply raise/lower pipe at that sliding joint.By extending the tubing above and below cross pipe there is places to weld in 45 degree gussets above pipe, and room to install bolts/pins below pipe..
Reply:A rivnut.
Reply:Folks, I'm thinking he is asking about how the top cross bar is attached to uprights, not the other detail pic of lower assembly.It is very possible that top bar is solid steel and bored/tapped at each end to accept bolt thru tubing...Or possibly thick walled DOM tubing that is threaded at each end like common drag links or tierods.