If you can buy a tap or die set for the threads, it's "standard". For those of you that own a lathe you can cut your own threads (but tapping the brake is going to be a problem) that are completely oddball in dimensions. And, if at some point in the future someone comes out with a commercial die set that by a fluke matches the threads you cut, then you are in violation.
So, play it safe and have the brake pinned, welded or fixed with set screws.
-Kframe
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