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Probably something like US 8-32,
https://www.engineersedge.com/screw_threads_chart.htm
Probably something like US 8-32,
https://www.engineersedge.com/screw_threads_chart.htm
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freezing77
Crop
What are these screws? They're in a speaker cabinet built in the 90s in America if that helps. I basically need to find a long nut to fit over them as the replacement drivers I've purchased for the box have a deeper rim and the screws don't even go past the mounting holes.
Edit - M4s fit for a couple of turns then jam.