By Christie L. Jones, market development manager at SPIROL International Corporation.
One of the primary benefits of using a coiled spring pin to affix a hub or gear to a shaft is the coiled pin’s ability to prevent hole damage. Another benefit is that the coiled pin absorbs wider hole tolerances than any other press-fit pin. This translates to lower total manufacturing costs of the assembly.(…)
via How to properly pin a shaft and hub assembly | Fastener + Fixing Magazine.