These PCB Assembly Guidelines are designed to outline best practices to help minimise errors arising during the PCB assembly process.
The world is divided into two parts one part works with the Metric system and the other with the Imperial system when defining measurements, the “µm” (micron) is 25.4 times smaller than the “Mil” (0.001 of an inch).
We decided many years ago to work exclusively in the Metric system to ensure the highest quality possible. Therefore the basis of all measurements given in this document and in our website are Metric and all Imperial values are there for clarification and general understanding ONLY.
As there is no general consensus throughout the global PCB industry on terminology, if we feel any term we use may be unclear we will try to explain it when it first appears.