The minimum Minor Diameter of a G1/4 (or 1/4 BSP if you're old-school like me) is Ø11.445mm, however there's a tolerance of +0.445/-0 on that. This gives a mean Minor Dia. of Ø11.668mm.
Hope this explains why there's this discrepancy.
If this answers your question please mark the thread as solved as it can help others find solutions in the future.
Marcus Wakefield
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I've created a Windows application (and now Mac as well) for creating custom thread files for Fusion. You can find out about it here. Hope you find it useful.
If you need to know how to offset threads for 3D printing then I've created a guide here which you might find useful.
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