Answer
Multi-turn spiral rings offer several advantages over traditional single-turn stamped circlips (DIN 471/472). First, they provide a full $360^\circ$ retaining surface, eliminating the 'gap' where a circlip could allow a component to tilt. Second, because they are coiled from cold-rolled flat wire, they have a uniform grain flow and no 'ears' or lugs, making them ideal for tight radial clearances. Mathematically, the thrust capacity is enhanced because the load is distributed across multiple turns, and the 'dishing' resistance is higher. In terms of performance, the spiral ring is dynamically balanced, whereas a stamped circlip is inherently unbalanced due to its lugs. This makes spiral rings the standard for high-speed rotating assemblies in aerospace and automotive drivetrains.
