Self-Locking Rings On Ungrooved Shafts


Self-locking retaining rings are used on shafts without grooves. The simple circular ring at the left of Figure 8 has a flat rim and will support moderate static loads. It is used widely because of its relatively small outside diameter.
The reinforced circular self-locking ring next to it has a curved rim and will handle greater loads even if some vibration is present. However, it has a larger outside diameter. These two rings work on the same principle: the prongs resist counter-pressure by digging lightly into the shaft. The fasteners can be moved, therefore, in one direction only. They should be used on non-hardened/soft shafts and, in most cases, must be destroyed to be removed.

Self-Locking Ring Comparison

In this respect, the grip ring shown at the right has an outstanding advantage. It can be moved in either direction and its position can be adjusted after installation by using retaining ring pliers that fit into the lug holes. Therefore, the ring can be used over and over again. These characteristics make it more suitable for applications where components may have to be disassembled for repair or maintenance.

Thanks for reading our Technical Considerations for the Selection of Retaining series. Whatever the fastener requirement, you can find a retaining ring that can meet it. The challenge is to find the right one that will perform according to your specifications and deliver the expected economies. Considering the rings described in this series is a solid first step to achieving that objective.

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