Of the Spring pin , also known as Spring splint pin, is used as a universal securing element to keep connected components in place. Spring pins hold nuts or crowns reliably in their position and prevent the elements from twisting.
The spring blog
What does the Relaxation with metal springs? This has little to do with a recovery phase of the spring, but describes the unintentional increasing loss of force of the spring with increasing ambient temperature and duration of load. Or what