Typically 4-5 mm along the edge of the board to be handled by the smd equipment. ( somewhat dependent on equipment.) Is your design pth or smd or both? Tim Easterling Cadd Manager Commercial Engineering SCI Systems Inc. 8600 S. Memorial Parkway MS 200 Huntsville, Al. 35802 (256)882-4426 (ph) (256)882-4700 x4426 (voicemail) (256)882-4304 (fx)