Thread Stripping in AL 6061 T6511
Thread Stripping in AL 6061 T6511
(OP)
Hey,
I am still young engineer and need some help.
I received a customer product the other day where the threads in an Aluminum 6061 T6511 plate had been stripped out. This product has been around awhile and this is the first occurrence. There are some other issues I am also dealing with but this is the only one they complained about.
So the issue I am trying to solve is why and how the threads were stripped. My initial thought and gut feeling is that they where simply over torqued, the thread size is M6 x1.0, and there is roughly 4 threads of engagement. The cap screws used to tighten the assembly together are made of Alloy steel grade 12.9.
The second thought was looking at the material properties of Al 6061 T6511. The assembly is rated for and often used at 204 C (400 F). It is a small actuator rated for 4 – 8 bar (60-120 psi).
Any help in how to figure it out or where to find the properties of Al and 400 F would help. I have been looking to find them but am coming up empty handed. My next step is going to be testing some units off the line and seeing how much torque is required to strip the threads. Thanks for the help
I am still young engineer and need some help.
I received a customer product the other day where the threads in an Aluminum 6061 T6511 plate had been stripped out. This product has been around awhile and this is the first occurrence. There are some other issues I am also dealing with but this is the only one they complained about.
So the issue I am trying to solve is why and how the threads were stripped. My initial thought and gut feeling is that they where simply over torqued, the thread size is M6 x1.0, and there is roughly 4 threads of engagement. The cap screws used to tighten the assembly together are made of Alloy steel grade 12.9.
The second thought was looking at the material properties of Al 6061 T6511. The assembly is rated for and often used at 204 C (400 F). It is a small actuator rated for 4 – 8 bar (60-120 psi).
Any help in how to figure it out or where to find the properties of Al and 400 F would help. I have been looking to find them but am coming up empty handed. My next step is going to be testing some units off the line and seeing how much torque is required to strip the threads. Thanks for the help





RE: Thread Stripping in AL 6061 T6511
RE: Thread Stripping in AL 6061 T6511
RE: Thread Stripping in AL 6061 T6511
BobM3 - I went through ProE and took some measurements and there should be roughly 5.6 threads of engagement. I am unsure at the moment if the screws have been removed previously but I think they have. They had some air leaking from one of the seals (different problem). I will check and find out soon.
Thanks for the quick responses.
RE: Thread Stripping in AL 6061 T6511
RE: Thread Stripping in AL 6061 T6511
Machinery's Handbook does have quite a bit of information on threaded fasteners.
Here are some helpful Internet sites:
http://www.boltscience.com
http://www.archetypejoint.com
http://r
h
If you are serious about learning about bolted joints, then look at these references: FAQ725-600: What are good fastener references?
RE: Thread Stripping in AL 6061 T6511
Cory - I appreciate the links, I am talking with Boltscience about their software and training for our company. I will be looking over the other links for find more information for future design and analysis work.
I will post and update when I reach a solution if anyone is interested.