Alternator tensioner adjuster bolt size?

2003 HONDA CIVIC
200,000 MILES • 1.7L • 4 CYL • 2WD • AUTOMATIC
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DAELIZANT
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My wingnut/bolt (adjusting bolt) on my alternator bracket came off while on the freeway, Where can I buy a replacement one and what are the dimensions of the bolt ? And if I could know how to properly adjust and get it to stay with out coming out due to vibrations?


If photo loads I’m referring to ( A )
Sep 10, 2025 at 8:30 AM
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STRAILER
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Sorry the image did not load, it take a while on mobile so be patient. I see the wing nut bolt in this diagram, this will be a dealer item, or you can use a regular bolt from the hardware store. It looks like it is 8mm 1.25 or 1.5 thread pitch 5 inches long. It might take a few tries. Check out the images (below). Let us know if you need anything else.
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Sep 10, 2025 at 12:40 PM
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