Circlips

Circlips are circular-shaped clips made from spring steel or stainless steel with elastic deformation properties. They are generally used to keep components fitted to shafts or housings and to support bearings in mechanisms that twist, spin, turn, or pivot. They are also sometimes referred to as retaining rings or snap rings, depending on regional terminology and design standard.

RS stocks an extensive range of fasteners, including circlips in various sizes and compatible shaft or bore diameters, suited to both light precision work and heavier industrial assemblies. Our selection covers fastening requirements for assembly, maintenance, and repair tasks across many sectors.

Types of Circlips or Retaining Rings

Circlips come in several distinct designs, each engineered for specific mounting configurations and load requirements. The type of circlip selected depends on whether it is installed on a shaft (external) or inside a bore (internal), the available installation access, and the axial forces it must withstand in operation.

Internal Circlips

Internal circlips are designed to fit inside bores or housings, seating within a machined groove to retain components such as bearings, seals, or bushings.

They are installed using circlip pliers that compress the ring, allowing it to be inserted into the bore before expanding into the groove. Once seated, they provide secure axial retention while allowing the retained component to be rotated or moved if required.

External Circlips

External circlips are fitted to the outside of a shaft, holding components such as gears, pulleys, and wheels in their correct positions.

They expand slightly during installation and then snap back into a machined groove on the shaft, providing axial retention under load. External circlips are widely used where components must be prevented from sliding along a shaft during operation.

E-Type Circlips

E-type circlips, also known as E-clips, have a distinctive 'E' shape and are pushed radially onto a shaft rather than being expanded over the shaft end. This makes them ideal for tight assemblies where the shaft is already fitted with other components or where end access is restricted. These circlips are typically used in lighter-duty applications compared to full circular circlips.

Lugless Circlips

Lugless circlips are designed without protruding installation lugs for a smoother outer profile. They are used when radial clearance is limited or where interference with adjacent moving components must be reduced. Installation typically requires dedicated tools suited to that specific circlip.

Bevelled-Edge Circlips

Bevelled-edge circlips feature a chamfered edge that improves seating within the groove and can help distribute axial loads more evenly. They are used in higher-load applications where improved groove engagement and reduced axial movement are required. Their geometry supports more stable retention in demanding mechanical assemblies.

Applications of Circlips

Metal circlips are used across a wide range of industries thanks to their simplicity, reliability, and ability to secure components without additional fasteners such as bolts or adhesives.

Automotive

In the automotive industry, circlips are used throughout engines, gearboxes, and drivetrain assemblies to retain pistons, gears, and bearings. They help maintain the structural integrity of rotating components subjected to constant vibration, thermal cycling, or mechanical stress. Common uses include piston pin retainers and CV joint assemblies.

Industrial Machinery

Industrial machinery relies on circlips to secure shafts, pulleys, and bearings within heavy-duty equipment such as conveyors, pumps, and hydraulic cylinders. Their quick installation and removal make them particularly valuable for reducing downtime during routine servicing and scheduled component replacement.

Consumer Electronics

Circlips are used in small consumer electronics such as cameras, printers, and household appliances to hold miniature components in place. Their compact form factor and low profile make them suitable for devices where internal space is at a premium and reliability over thousands of operating cycles is expected.

Robotics & Automation

Robotic arms, linear actuators, and automated assembly systems depend on circlips to retain rotating shafts and precision bearings. Consistent retention is critical in these applications to maintain positional accuracy and prevent costly unplanned downtime on the factory floor.

Manufacturing

In manufacturing environments, circlips are found in tooling, jigs, and production-line machinery, securing moving parts subjected to continuous operation. Their ability to withstand repeated assembly and disassembly cycles makes them a practical choice for workshop and factory use.

Key Factors to Consider When Choosing Circlips

• Shalf or Bore Diameter Tolerance: Improper fit can lead to loss of retention or excessive installation stress. Industry practice typically follows DIN 471 (external) and DIN 472 (internal) standards for dimensional consistency.
• Material Selection: Critical in environments exposed to moisture, chemicals, or temperature variations, with stainless steel preferred for corrosion resistance and spring steel commonly used for high-elasticity applications.
• Installation and Removal: Installation and removal must be carried out using the correct circlip pliers or dedicated installation tools, as improper handling can permanently deform the clip or reduce its retention capability.
• Load Ratings and Groove Designs: These must be matched to operating conditions, since circlips are designed for axial retention only, and do not transmit torque or radial load.

The Leading Supplier and Distributor of Circlips in Singapore

RS is a trusted supplier and distributor of circlips in Singapore, offering dependable fasteners from leading manufacturers such as RS PRO. Our circlip range covers various shaft diameters, bore sizes, and material specifications, from small precision retaining rings for compact assemblies through to heavier-duty snap rings built for demanding industrial equipment. Stainless steel, carbon steel, and spring steel options are available to suit different environmental and mechanical conditions.

If you require other types of fasteners and fixings, such as washer fasteners, hose fittings, or self-drilling screws, you can find them in our online catalogue as well. RS Singapore offers free next-day delivery on qualifying orders, making it easy to source the right metal circlips for your needs. For more information about our delivery services and shipping options, please visit our delivery page.