How to specify plating thickness
When specifying thickness on parts it is important to understand how thickness should be applied. Electroplating is an electrolytic process governed by the tendency of electricity to follow the path of least resistance. Technical Plating measures plating with X-Ray or eddy current units as appropriate. Certifications are available at $15 each. For more on this topic please see our Deposit Thickness & Uniformity Topic. The following terms are used to determine application:
Average thickness is used to describe a part that requires an average thickness at a specification and is open to the plater to determine where those thicknesses are measured. This the most economical plating and suitable for 75% of plating applications. Technical Plating will be able to provide guidance as to the specific application and what to expect as it relates to thickness distribution.
This is used to describe parts that require a minimum thickness on agreed upon functional locations but, the maximum thickness is reasonable but, not a critical dimension.
This is used to describe parts that require a maximum thickness on agreed upon functional locations however, the minimum thickness is reasonable but, not a critical dimension.
This is used to describe parts that require a minimum thickness on agreed upon functional locations as well as the maximum thickness in the same functional location. This may or may not always be possible depending on the geometry of the part in question. Plating of this type is least economical and should only be used when critical for the application.