Threaded hole strength in 6061 aluminum
Threaded hole strength in 6061 aluminum
(OP)
It's been a long time since I had to do anything like this and my old ME training is rusty. I need to determine the tensile strength for a threaded hole. As the hole is under the normal rule-of-thumb depths for full bolt strength, AND the material is weaker than the bolt, I figure the weak link will be the threaded hole. I need to determine how much load this can handle.
Parameters and constraints:
- Standard steel M3 socket screw
- Threaded hole into a 6061 aluminum part.
- I'd plan to try to get a formed thread but to be conservative consider a medium fit cut-tap thread.
- Thread depth is 4.5mm max, I'd say allow .5mm for chamfer, etc., and call it 4mm of thread engagement possible. I can't make the hole any deeper.
Can someone help me calculate the tensile strength of this connection?
Parameters and constraints:
- Standard steel M3 socket screw
- Threaded hole into a 6061 aluminum part.
- I'd plan to try to get a formed thread but to be conservative consider a medium fit cut-tap thread.
- Thread depth is 4.5mm max, I'd say allow .5mm for chamfer, etc., and call it 4mm of thread engagement possible. I can't make the hole any deeper.
Can someone help me calculate the tensile strength of this connection?






RE: Threaded hole strength in 6061 aluminum
RE: Threaded hole strength in 6061 aluminum
RE: Threaded hole strength in 6061 aluminum
RE: Threaded hole strength in 6061 aluminum
Maine EIT, Civil/Structural.
RE: Threaded hole strength in 6061 aluminum
But cart before the horse, I need to determine the threaded hole strength.
RE: Threaded hole strength in 6061 aluminum
RE: Threaded hole strength in 6061 aluminum
RE: Threaded hole strength in 6061 aluminum
http://www.roymech.co.uk/Useful_Tables/Screws/Thre...
RE: Threaded hole strength in 6061 aluminum
"To ensure that the screw fails before the thread strips it is necessary the the shear area is at least 2 times the tensile area."
Stupid me, I thought I WAS in the ME area, not sure how I made that mistake, thanks for pointing it out. I'll repost there.
RE: Threaded hole strength in 6061 aluminum
Moved to:
http://www.eng-tips.com/viewthread.cfm?qid=362988
RE: Threaded hole strength in 6061 aluminum
Maine EIT, Civil/Structural.
RE: Threaded hole strength in 6061 aluminum
RE: Threaded hole strength in 6061 aluminum
RE: Threaded hole strength in 6061 aluminum
Maine EIT, Civil/Structural.
RE: Threaded hole strength in 6061 aluminum
RE: Threaded hole strength in 6061 aluminum
RE: Threaded hole strength in 6061 aluminum
Maine EIT, Civil/Structural.
RE: Threaded hole strength in 6061 aluminum
RE: Threaded hole strength in 6061 aluminum
Maine EIT, Civil/Structural.
RE: Threaded hole strength in 6061 aluminum
RE: Threaded hole strength in 6061 aluminum
Maine EIT, Civil/Structural.