Annular rings

An annular ring is the circumferential copper ring around a plated contact.

Example – Standard

Standard annular ring

Example – Microvia

Microvia annular ring

Example – Component hole

Component hole annular ring

Please note: Printed circuit boards with drill holes sized 0.5mm or smaller that are intended as component holes must be manufactured with a chemical surface, otherwise these holes will be filled with tin during the HAL process!