Where to buy machine screw assortment?
Trying to thread a machine screw into some aluminum.
You could be getting galling on the threads, where the aluminum gets
"gummy" under pressure and stops being a good sliding surface for the
steel. You might try lubricating the threads before assembly, using
antiseize, or even going to a thread insert (like Helicoil or
Keensert) in the aluminum.
--Glenn Lyford
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