There was a number of postings on the subject of torque and its effects on different PWB materials on this forum back in the 2001 timeframe, I believe. You may wish to do a search in the archives on the subject. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Randall L Bock Sent: Thursday, October 08, 2009 8:45 AM To: [log in to unmask] Subject: Re: [TN] torque You need to use the PWB material as the torque spec otherwise you run the risk of tearing out the standoff. Recommend using nylon screws. Have to look but I believe the spec would be 3 - 5 inlbs. Randy Bock Sr. Quality Engineer / Product Quality Manager Enterprise Quality Assurance (Email) [log in to unmask] Newtown Building 2 203 270-4931 (NT2) 8-426-4931 (Fax)203-270-4982 Shelton 27 WV 203-922-4014 (Cell) 203 300-3547 Pitney Bowes "Engineering the Flow of Communication" This email message may contain confidential, proprietary and /or privileged information. It is intended only for the use of the intended recipient(s). If you receive this in error, please immediately advise the sender by reply email and delete this email message. Any disclosure, copying, distribution or use of the information contained in this email to or by anyone other than the intended recipient is strictly prohibited. Any views expressed in this message are those of the individual sender, except when the sender specifically states them to be the views of the company. Thank You. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Walt Manchin Sent: Thursday, October 08, 2009 9:29 AM To: [log in to unmask] Subject: [TN] torque Hello All, I have been working with customer that wants to attach daughter board to mother board using standoffs and #6 screw. We found specifications for torque on certain type of screws, but what is your experience on the torque required to attach PCB's before causing damage to the BOARDS AND/OR MATERIALS? Thanks in advance. Walter Manchin Prototron Circuits Mid Atlantic 610-499-4964 - (office) 610-299-8969 - (cell) mailto:[log in to unmask] www.prototron.com <http://www.prototron.com/> Prototron --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------