What is nippling in helical spring?

Nippling in a helical spring refers to the process of forming the ends of the spring so that they can fit into a specific application or assembly. This can involve creating a slight curvature or a specific angle at the ends of the wire to enhance the spring's performance and ensure proper seating in its housing. Nippling helps to prevent fraying or loosening of the coils during operation, contributing to the overall durability and efficiency of the spring.