A centered hole is only the nominal conditionThe example shows a displaced circular opening within a circular land. It is a geometric planning illustration, not an IPC acceptance limit.A centered hole is only the nominal conditionFinished hole and preplate opening use different size conventionsRelative displacement consumes one side of the ring.Illustrative circular envelopeLand: 0.60 mmPreplate estimate: 0.35 mmRegistration: 0.075 mm(0.60 − 0.35) / 2 − 0.075= 0.050 mm geometric ring³Ô¹Ïtv · Engineering explanation · Conceptual, not to scale