1/2x20 bolts, what the..?

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Can you be more vague?
1/2"x20 is an SAE thread size. 1/2" wide, 20 tpi
12mmx1.5mm is a metric thread size. 12mm wide 1.5mm thread pitch.
What are these spacers for? What are you trying to do?
No they wont interchange. The halfs are too big of diameter and the pitch on them is off.
If its wheel spacers, I got set from trailgear. They fit fine and I'm happy.

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