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Thanks Cory and unclesyd, once again more useful information. Thanks for your time this site has proven to have a wealth of information.

AlfaTony Thanks for those sites. They look pretty helpful. NickE do u know anything of Al 6019 or 6011. The Zinc enrichment in these two Aluminums leads me to believe they will be fairly hard as in 120 HB500 or even harder. I am having trouble finding resources on these two specific...

Thanks for the suggestion, but once again I can fix the problem once it occurs I just need to prevent it. Aren't helicoils mostly used for after the threads are ripped out? Thanks for the idea though. I would prefer finding a harder Aluminum in the 6xxx range.

Thanks RikuY I have used a lubricant on the threads, but I do not like it because it is more of a band aid then it is a solution. I would prefer finding a harder Aluminum 6xxx.

Yes (unclesyd) NPT. The valve itself is brass. FYI

Currently I am using a 6061-T6 Aluminum and it is being machined out and threaded. The aluminum is then being welded and after welding the threads become vary soft so soft that the valve that goes in the threads is ripping the threads out upon eventual replacement of the valve. So I need an...

I was curious to find a Hard, Weldable, Machinable Aluminum. I am looking at AL-6019 and AL-6020. I can not find much information on either. Does anyone know anything about these or good sites with information them relative to each other? Also any other suggestions on possible other...