The Class 3/A & Military Specs
What is the minimum dielectric between two planes?
The minimum dielectric between two planes is 3 mils.
What is the minimum annular ring on finished boards?
The minimum annular ring on finished boards is 2 mils.
What are the annular rings for inner and outer layers in the working Gerbers?
In your Gerber files, you should have a minimum annular ring of 6 mils for inner layers and 7 mils for outer layers.
What is the minimum plating inside the hole (PTH)?
The minimum plating inside the hole is 1 mil.