What is the smallest acceptable plated through hole diameter in a .063" thick FR4 board without running into barrel-cracking problems? Our suppliers are saying that a .010" drill dia. is acceptable for vias, but this exceeds the 3 to 4 aspect ratio (hole diameter to board thickness) that many books specify. Are our books out of date? Thanks in advance Jack Tippit [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************