Dear ALL Guys: I am meeting with an investigation on the specification which regulates the hole roughness requirements, As all you known, the default value is usually 1.0 Mil for hole roughness after drilling, but after consulting the IPC-6012 and other IPC references, I still have not got the answer for this question, so need your help to give me some clues where I can find the evidence about the hole roughness? Why is it 1 Mil in some customers¡¯ SPEC? Thanks! Winning --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------