The annular ring

You should always consider the following rule when designing your data: Pad Ø = Finished Ø + 0,35mm

For the nomenclature:

  • the Pad Diameter describes the solder pad
  • the final/finished diameter of your hole is often also called the nominal diameter or drilling diameter
  • the tool diameter is determined by us, which is also stated under the term drill diameter
  • the annular ring is the solderable ring after drilling (the red area in the drawing)

Design tip

If the annular ring in your layout does not conform to our specification then we will adjust the finished hole size or the pad diameter. As a result of this the price can increase.

Our advice: During the design of your PCB data consider the following rule of thumb: Pad diameter = finished hole diameter + 0.35mm

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