September 11, 2026
Daniel Gómez

Retaining ring applicators, dispensers and pliers: how to choose the right tool

Retaining rings are essential components for the axial retention of parts on shafts and in bores. Although their operating principle is simple, incorrect installation may cause deformation, assembly difficulties or even premature failure of the assembly. For this reason, using the correct tool is just as important as selecting the appropriate retaining ring.

Depending on the type of ring, installation frequency and working conditions, there are three main tool families: retaining-ring dispensers, applicators and pliers. Each performs a specific function and is designed to improve speed, accuracy and safety during installation and removal operations.

Dispensers: the best solution for repetitive assembly operations

Dispensers are designed to store and present retaining rings in an orderly manner, allowing the operator to remove them one at a time and install them using a compatible applicator. Their main advantage is reduced handling time and improved repeatability in continuous assembly processes.

When hundreds or thousands of rings are installed each day on a production line, handling them individually can slow down the process and increase the risk of errors. Dispensers keep the rings correctly oriented and ready for installation, significantly streamlining the work.

When should a dispenser be used?

Main types of dispensers

Several dispenser types are available depending on the intended use and workstation conditions: SD models with a spring rail, RD models with a compact ergonomic design, and D models intended for heavy-duty service and intensive industrial applications.

Applicators: fast and accurate installation of radial retaining rings

Applicators are designed for the fast, controlled and repeatable installation of radial retaining rings on shafts. They are used together with dispensers, enabling the ring to be loaded and advanced into its groove without rotating the tool during the operation.

The applicator’s main advantage is that it guides the ring into the correct position, reducing the risk of faulty installation and improving assembly consistency.

Important: to use a dispenser and applicator combination, the rings must be purchased in a stacked or collated format specifically prepared to feed the system; loose rings do not permit fast, orderly loading. Two common supply formats are available: rings aligned and held together by removable adhesive tape, which is fed into the dispenser rail and removed before use, and rings stacked on support rods or wires, mainly used for certain models and sizes. The supply format must match the ring type and the compatible dispenser; the ring reference, stacking system, dispenser and applicator should therefore be checked together before purchase.

When should an applicator be used?

Types of applicators

Several applicator types are available depending on the working method and access to the installation area. Standard models enable fast, repetitive ring installation, while lightweight versions provide a simpler solution for less intensive use. Straight, 45° and 90° configurations are also available for installation in confined spaces, together with offset or special versions for applications involving more demanding access, diameter or geometry requirements.

Pliers: the essential tool for installation and removal

Retaining-ring pliers are the most versatile tool when the ring geometry does not permit the use of a dispenser or applicator. In many cases, particularly with rings featuring lugs or installation holes, installation and removal can only be performed using pliers, as these tools allow the ring to be expanded or compressed in a controlled manner for correct seating in its groove.

Different types of pliers are available to suit the ring and application: for internal or external retaining rings, in metric or inch sizes, with straight or angled tips, as well as reinforced, convertible or ratcheting versions for large diameters or more demanding work.

Recommendations for safe and effective installation

For best results, always select the correct tool for the ring type, diameter and working conditions. Using an unsuitable tool may cause deformation, reduced productivity or installation difficulties.

Safety glasses should also be worn when installing and removing retaining rings, as these components store elastic energy and may be accidentally ejected.

Conclusion

Dispensers, applicators and pliers do not compete with one another; they are complementary tools. Dispensers optimise ring preparation and feeding, applicators enable fast and repeatable installation of radial retaining rings, and pliers provide maximum versatility for installation and removal tasks. Selecting the correct tool makes it possible to work faster, reduce errors, extend the service life of the rings and improve operator safety.