Alternator lower bolt

:
'02 Mazda Protege5
Does anyone know the exact size of the lower bolt on the alternator? Mine keeps loosening for some reason and every 100 miles or so I have to reach down and tighten it or the belt will get loose. so annoying.
 
The lower one is the pivot. How does belt get loose if adjuster and locknut up top are tight?................red Loctite should stop any unwanted loosening. Of course it will also be a hassle whenever you want that loose, like for alt swap.
 
Back