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Upper threads are 3/8" x 24. This has pitch of 24 which is 0.042" and 1.0mm is 0.039". Its what would be commonly known as an imperial fine thread/pitch.
We went back and forth on what we should use and in the end went with the imperial size as these nuts are easy to find anywhere if you ever needed one quickly.
The washers can either be stepped or flat with a serrated face to help with the friction. They will come in hardened steel or Titanium. Nuts are 12 pt and will be hardened steel or Titanium.
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