This is such a lame question, but: I can't seem to find the reference in IPC documents regarding board thickness and tolerance, Except in IPC-D-275 5.2.4 it says "Board thickness shall be specified on the master drawing and unless otherwise specified, shall include metallic deposition" I have always heard the tolerance should be +/-10% (.062 +/- .007, for example) But I can't find it! help..... Jack p.s. If someone specified a thickness as ".093 nominal" what would be acceptable on incoming inspection? ################################################################ DesignerCouncil 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 DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################