Round Shims

Round Shims

Round shims, also referenced as shim rings or tolerance rings, are used in stamped, molded, or worn housings to form a tight hold on bearings. Frequently used with retaining rings or lock washers, shim rings prevent axial movement by taking up play between machine components. To ensure they retain their shape under excessive forces, the contact faces of the shim and component must be smooth and of similar hardness to avoid excessive wear.