This property is used if no connection dimension has been entered for the individual connection point in the connection point pattern. A connection dimension can be specified in this property for bolt connections, flat plug-in connectors, band connections, rail connections, internal threads and external threads.

Example: For a terminal with the connection category "Bolt connection" you can specify the bolt diameter here, for example "3 mm". For a push-in fitting with the connection category "External thread" you can specify the connection thread here, for example "M3" or "G1/8".

Reference

MDPartsDatabaseItemPropertyList Class
MDPartsDatabaseItemPropertyList Members