In this Question Line video, Jason answers the following question about designing for coaxial holes: 

I have two holes and I want to push a rod through them, what GD&T should I use? We have True Position, but when we inspect it, every single one of our parts fail, but I can still slide a mock rod through both ends.

Designing for coaxial holes Fig 1

 

In this video, Jason reviews the weldment drawing shown above and demonstrates how to calculate the position tolerance needed for a zero-clearance fit in the worst-case assembly scenario, ensuring that the shaft can pass through the two coaxial holes. 

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