Thread size of speaker cable binding posts

Cable Asylum

Interconnects, speaker wire, power cords. Ask the Cable Guys.

I somehow have a really hard time finding this information.
Is there a most commonly used thread size for speaker and amplifier binding posts - the outer part that clamps down speaker wires or spades (similar to image)?
I'd like to use a simple copper nut instead of the usual plastic clad brass items.
It seems there are ones that are roughly 6mm in diameter, and some that are around 8.5mm, plus a few proprietary sizes.

My speakers and the amp use a thread that almost is a metric M6, but a tad larger than 6mm; so it's probably an imperial thread size and of unknown (to me) pitch.
Any hints for an ignorant European?

Edits: 02/12/24

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Topic - Thread size of speaker cable binding posts - horst 15:05:58 02/12/24 (6)

RE: Thread size of speaker cable binding posts - 6bq5 11:29:36 02/13/24 (1)

RE: Thread size of speaker cable binding posts - horst 02:17:11 02/14/24 (0)

RE: Thread size of speaker cable binding posts - Tangram 03:55:18 02/13/24 (3)

RE: Thread size of speaker cable binding posts - horst 02:19:46 02/14/24 (1)

RE: Thread size of speaker cable binding posts - Tangram 11:37:04 02/14/24 (0)

RE: Thread size of speaker cable binding posts - KanedaK 22:23:11 02/13/24 (0)

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