Hello Victor, I hope I'm understanding your question. Try IPC-DR-572, 'Drilling Guidelines of Printed Boards', IPC-6012A with Amendment 1, 'Qualification and Performance Specification for Rigid Printed Boards', Page 5,Table 3-2, Final... Plating Coating Requirements. I hope this helps. Regards, Paul Holloway; [log in to unmask] 847-352-5015 -----Original Message----- From: Victor Hernandez [mailto:[log in to unmask]] Sent: Friday, March 21, 2003 10:47 AM To: [log in to unmask] Subject: [TN] PCB thickness vs Hole side ( ASPECT Rratio ) Importance: High Jack and Fellow TechNetters Where can I acquire a copy and/or documentation regarding the above stated inquiry. This deals with acceptable/allowable barrel plating thickness. Victor, --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------