Hi, These questions are directed primarily at the PCB fabrication professionals out there, but any input is welcome. What is the standard location tolerance for a first stage drilled hole, (unplated)? What is the standard location tolerance for a second stage drilled hole (unplated)? Lets assume IPC Class 2. I tried looking through IPC 6012 and IPC-2221 but cold not find any indication of what first stage drilled holes or second stage drilled holes. Where can I find any industry documentation used by the PCB fabricators to identify this information? Thank you in advance. Tom Burek, CID+ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________