Thru axle thread pitch question

Hi, I have a 2017 Giant Defy Advanced 1 disc frameset I am building up, but don't yet have the thru axles for it. A pair of Giant branded ones are £50 and specify a 1.0mm TP (thread pitch), yet I have some axles from my Specialized Diverge which are the same TP and they won't screw in.
I would like to get a set of aftermarket ones, like the BrandX ones from Wiggle for half the price, but am unsure of exactly what TP I need, can anyone confirm it for me?
 

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1mm thread pitch is very fine, are you sure this is related to the axle thread and not something else?
 
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