SNK Architectural Abbreviation

Sink

Dimples or other distortion in the surface of the part as different areas of the part cool at different rates. These are most commonly caused by excessive material thickness. A depression on the part surface over a thick wall feature i.e., a rib, boss, thick sprue gate or change in wall section. Caused by the delayed cooling effects of the center of the thick area. When the hot center cools, it shrinks and pulls down the skin on the surface.