Brake boss thread pitch

Swede

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What tap do I need? I'm guessing the answer varies as I've seen mention on M10x1.5 and 5/16"-18 UNC.
 
They vary depending on size m6 x 1, m8 x 1.25 and m10 x 1.5 being the norm. American frames might use imperial.
 
Or take a screw with known pitch and hold them together. If the threads fit right into each other you have your measurement (although a pitch gauge is a useful tool).
 
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