E-Clip

E-rings, also known as E-clips, E-type retaining rings, or E-style snap rings, are three-pronged, stamped spring steel fasteners with a distinctive “E” shaped profile. They are designed for radial installation into a machined groove on the outside diameter of a shaft or tube. Unlike external circlips that require installation from the shaft end, E-rings are snapped directly into the groove from the side, allowing for assembly in confined spaces where axial access is limited. Their unique design provides a wide shoulder, offering a larger retaining area and higher thrust load capacity compared to other external retaining ring types.

How They Work

E-rings have three prongs (or fingers) that engage the shaft groove. During installation, the ring is positioned with its open side facing the groove and pressed radially onto the shaft until the three prongs snap securely into the groove. The center prong provides the primary retaining force, while the two outer prongs stabilize the ring and distribute the load. The spring tension of the steel creates constant radial pressure against the groove walls, preventing axial movement of components such as bearings, gears, or pulleys. Installation requires no special tools, though E-ring pliers or small screwdrivers can be used for removal.

Applicable Standards

Materials & Surface Finishes

Common Applications