We use the same torque values whether on PWA or chassis. We use locking feature nuts, screws or thread inserts. Epoxy tacks are always used on any fastener, especially on PWA since the torque (pre-load) relaxes with time. Rainer G. Blomberg Honeywell -Space Systems Clearwater Principal Production Engineer (727) 539-5534 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Lum Wee Mei Sent: Wednesday, March 11, 2009 10:44 AM To: [log in to unmask] Subject: [TN] Torque Value for fastener used on electronic printed circuit board / chassis Hello, I come from electronic background and sometime mechanical fasteners are required to secure the connectors and electronic components. I often wonder how the torque values are determined when used with printed circuit board or with metal chassis, when plain and /or split washer are used. secure with fastener. Some said adhesive is required for the nut, some said not necessary. I hope someone can enlighten me on this issue. Thanks and Regards, ~ Wee Mei ~ --------------------------------------------------- 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 -----------------------------------------------------