The smallest plated through hole with clearance is:

• for up to .062: thick rigid PCB is .010" / .25 mm
• for Flex PCB is .006" / .152 mm

Standard finished hole diameter tolerance is +/- .003 inches / .076 mm. Please note that if the hole is in or near the border of a P.I. feature, no guarantee can be made regarding the diameter of the finished hole: particles will plate inside the hole and partially or fully obstruct the hole. If no choice try to off set via from the feature.

Standard hole true center tolerance +/- .0005" on rigid material, +/-.001" on flex material, measured from another feature, not an edge.

Note: Exatron is not responsible for Gerber file or FAB drawing errors that cause a plated through hole to be unattached to the top/bottom feature on the PCB. Example: The artwork has a .050" dia. hole but the drill size is called out for .031". The result is a plated through dough nut.

We can manufacture test boards with custom routed plated through holes/slots. These can also be "blind" pockets. If required be sure artwork over hangs all routed edges by at least .010"/0.25mm.