A 螺旋挡圈 that retains things is a precision-engineered fastening component that is formed from a flat wire that is wound into a continuous 360° shape of spiral. Currently popular products include 波环 和 卡环. Contrasting with traditional snap-rings that have ears or lugs, spiral-ring retaining devices have a smooth, uniform cross-section that lacks gaps or extra features. They’re installed into a pre-made cut on a shaft or into a pre-made hole on a bearing’s axis in order to maintain the stability of the bearing, gear, sleeve, and other parts that are assembled. Their separate design don’t have an overlap, which ensures a stable, concentrated load, and a good balance.