Flat Type wave springs except the character of Chest to Chest Wave Spring, provide entirely contact surface when compared to the wave point contact of plain ends. The flat end under load more evenly distributes the spring force upon adjacent components. The feature is similar to the concept of double disc grinding for a flat surface  

Flat Type wave springs except the character of Chest to Chest Wave Spring, provide entirely contact surface when compared to the wave point contact of plain ends. The flat end under load more evenly distributes the spring force upon adjacent components. The feature is similar to the concept of double disc grinding for a flat surface