durchgangsloch

Durchgangsloch is a term used in German to describe a hole that passes completely through a material or component. In English it is typically translated as through-hole or through-hole feature. The concept is used across engineering disciplines to permit the passage of fasteners, shafts, cables, fluids, or other elements, or to align two sides of a part. Etymology: from durch- "through" + Gang "passage" + Loch "hole".

In mechanical engineering, a through-hole is drilled or bored to extend across the entire thickness of a part. It enables fastening with bolts or pins, or the passage of axles, wires, or piping. Tolerances, burr control, and surface finish are important; counterboring, countersinking, or threading may be employed.

In electronics, the term often refers to holes in printed circuit boards that accept component leads. Through-hole components are inserted through the board and soldered on the opposite side, as distinct from surface-mount devices.

In construction and building services, Durchgangsloch can denote an opening in walls or partitions to route pipes, cables, or ventilation. Such openings must consider sealing, insulation, fire stopping, and structural implications.

The term is distinct from blind holes, which do not extend completely through the workpiece, and from specialized recessed holes intended for countersunk fasteners.

See also: through-hole technology, PCB via, bore, hole, pass-through.