1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
(OP)
I need to determine a safe working load for the tensile strength of this connection and its giving me trouble. Any tips out there? Dave Wallace and then there is the question of torque so as to not damage the aluminum.





RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
What direction is the force to the surface of the plate?
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
Torque a bunch of samples to death.
Repeat with 1/4-28s.
20 tpi = .05" thread pitch. .125/.05 = 2.5 threads engaged at most.
Good design would have a chamfer at the ends of the tapped hole, so you are down to even less.
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
Now, again, WHAT DOES THE CONNECTION LOOK LIKE?
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
Run away!
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
It looks like you can expect the aluminium to fail in shear. The Machinery's Handbook has notes on shear failure of internal threads.
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JHG
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
A 1/4-20 bolt in 1/8" thick aluminum will have only 2-1/2 threads for shear area at the threads. Failure will occur in the aluminum, not the bolt. For most 1/4-20 applications, the pullout resistance will likely be in the 150-200 lbf range. For working load, that would be about 50 to 60 lbf, assuming 6063-T6 aluminum.
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
https://www.fastenal.com/content/feds/pdf/Article%...
http://www.eaa1000.av.org/technicl/corrosion/galva...
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
Dave Wallace
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
I was about to recommend piercing and extruding a hole in the sheet before running an 'express' tap through it, but that becomes more interesting for a pattern.
How many bolts are in the pattern?
What is the bolt spacing now?
Mike Halloran
Pembroke Pines, FL, USA
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
For the most part this alloy is used for extrusions which usually come in the T6 condition.
B.E.
You are judged not by what you know, but by what you can do.
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
Is this for some kind of sun shade on a building ? Can you put a through hole through the 1x1x1/8 tube and weld a 1/4" thick 6061 threaded plate to the tube , or is this appearance critical ?
B.E.
You are judged not by what you know, but by what you can do.
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
Mike Halloran
Pembroke Pines, FL, USA
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
http://fasteners.sherex.com/viewitems/ind-rivet-nu...-
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
Be careful with welding. Keep in mind that for aluminum, the allowable stresses are greatly reduced within 1 inch of a weld.
You also mentioned in your later posts that 6061 aluminum is being used. Make sure you know which you are analyzing. They have considerable differences in their yield, shear and ultimate strengths.
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
I collect old books. If I saw that in an old book store, I would snap it up immediately. For serious work, I think it is time for a new one.
--
JHG
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.
RE: 1/4"-20 stainless bolts threaded into 1/8" thick 6063 aluminum.