Printed Circuit Board Design Tolerances | Advanced Circuits
For scoring, minimum of .015 for outer layers and .020 for inner layers. Pad Size/Annular Ring. Pad size should be at least + " over finished hole size for vias and + " over finished hole size for component holes. This means the annular ring (radius of the pad) should be at least .005" for vias and a minimum of " for component holes.