The crossword solutions for the term CIRCULAR PARTS are ADS, which stands for Annular Disc Springs. Annular Disc Springs are mechanical components that are used to absorb shock and vibration in a variety of applications. They are made up of a series of concentric discs that are held together by a central bolt. The discs are designed to compress and expand in order to absorb the shock and vibration. Annular Disc Springs are commonly used in automotive, aerospace, and industrial applications.