LionCircuits Turnkey PCB Support

Why should the annular ring be 0.15 for via holes, and the via holes be a minimum of 0.4 mm?

This dimension is recommended because the plating on the holes has to be done properly. This is the minimum required dimension. However, it is better if it is more than a 0.15 mm gap for via holes.

The quality of the plating on the holes will be better if the via holes dimension is 0.4 mm.

The image below shows the exact dimension of the via hole and the annular ring :

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