Retaining Ring (Circlip) are selected when an assembly calls for axial retention of components on shafts and in bores. This application guide to the ISO / DIN type covers concrete end-uses, the specification checklist, correct installation, and where an alternative fastener performs better. Stocked across roughly M8 to M100, they cover general to heavy-duty work.
Typical Applications for Retaining Ring (Circlip) — ISO / DIN (Series 147)
The most common settings where these are specified:
- General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.
- Maintenance & repair (MRO): a stocked size for servicing existing plant where the original fastener spec must be matched.
- Fabrication & metalwork: bench and on-site assembly of steel frames, enclosures and weldments.
- Shafts & gearboxes: retaining bearings, gears and pulleys against axial movement.
- Hydraulic & pneumatic: holding pistons and seals in bores.
How to Specify Retaining Ring (Circlip) — ISO / DIN (Series 147) for Your Application
- Size: Match the nominal size to the mating thread or hole. This product spans M8–M100; check the full table below for the exact dimensions of each size.
- Groove fit: Specify to the shaft or bore groove diameter; the ring must seat fully in the groove to carry the thrust load.
- Environment: For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient.
- Standard: This product is supplied to ISO / DIN. Quoting the standard on your order guarantees interchangeable dimensions between suppliers.
Installation & Assembly Practice
- Use the correct circlip pliers for the ring size; over-spreading a ring permanently reduces its retention.
- Check the ring is fully seated in the groove around its whole circumference before loading the assembly.
Common Selection Mistakes with Retaining Ring (Circlip) — ISO / DIN (Series 147)
- Machining the groove to the shaft tolerance instead of the groove dimensions in the ring standard.
- Loading a standard ring axially beyond the groove rating instead of moving to a heavy-duty section ring.
Where Retaining Ring (Circlip) — ISO / DIN (Series 147) Are Not the Right Choice
Not for heavy axial thrust beyond the groove rating, and not where the groove cannot be machined to spec.