Help I lost my nuts...lol

tonysrt said

5/8 X 18 is not a fine thread. 5/8 X 24 would be a fine thread and I just went thru this at Ace Hardware today. I needed 5/16 X 24 nuts and they only had 3 when I needed 4. Never fails!

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That's incorrect.
You are posting wrong information.
5/8 X 11 is course thread
5/8 x 18 is fine thread.
5/8 X 24 is another fine pitch, thread size.

Your 5/16 nuts needed, are a whole lot different than 5/8, the op is after.