Darrel Proceed with caution, especially on unsupported screws that can bow the board. Have found that 20-25 in/oz is adequate with loctite type products. Use of loctite or similar seems very important with the small screws as locking washers don't have the strength to hold as would say a 3/8 bolt w/ lockwasher. Matter of fact, on these small screws, save yourself some time, toss the mechanical locking device, just research your chemical bonder and go with it. (Production likes it if they don't have to search for lost washers too) Good Luck Jeff >-----Original Message----- >From: Darrel Therriault [SMTP:[log in to unmask]] >Sent: Monday, March 30, 1998 6:13 PM >To: [log in to unmask] >Subject: [TN] Torque Specs > >Technet: > >For PWAs that require connecters fastened with hardware >(screws/lockwashers) to the >FR-4, is there an acceptable torque setting requirement that will not >damage the >FR-4? These are usually 2-56 or 4-40, but will standard torque for these >sizes damage the FR-4 in any way?? > >Should it just be tighten firmly and use locktite to secure it? > >Curious to know if there is a standard method for doing this attach and >secure. > >Any information appreciated. > >Regards........DT > >################################################################ >TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c >################################################################ >To subscribe/unsubscribe, send a message to [log in to unmask] with following >text in the body: >To subscribe: SUBSCRIBE TechNet <your full name> >To unsubscribe: SIGNOFF TechNet >################################################################ >Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional >information. >For the technical support contact Dmitriy Sklyar at [log in to unmask] or >847-509-9700 ext.311 >################################################################ > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################