Hi George. An unsupported hole is one that has no plating in it. A supported hole is plated-through. Dave -------------------------------------------------------------------- David W. Bergman CAE Vice President of Technical Programs IPC 2215 Sanders Road Northbrook, IL 60062-6135 P 847-509-9700 x340 F 847-509-9798 email [log in to unmask] IPC's website www.ipc.org -------------------------------------------------------------------- >>> "Uptain, George" <[log in to unmask]> 04/15/98 10:49AM >>> Greetings; Would someone with a copy of IPC-T-50 please tell me what the diff is between an unsupported hole and a supported hole? Thank you ################################################################ 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 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 ################################################################ ################################################################ 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 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 ################################################################