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Retaining Rings · Trade series (wave and crescent retaining rings) · Application guide

What Are Wave Circlips (Crescent Rings) Used For?

Typical applications, the industries that specify wave circlips (crescent rings), and how to choose the right size, material and finish for the joint.

Wave Circlips (Crescent Rings) are used for axial retention of components on shafts and in bores. They are manufactured to Trade series (wave and crescent retaining rings), and selection is driven by the shaft / bore diameter, the fit and tolerance the assembly requires, and the service environment.

Primary duty
Axial retention of components on shafts and in bores
Governing standard
Trade series (wave and crescent retaining rings)
Category
Retaining Rings

Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation.

What Are Wave Circlips (Crescent Rings) Used For? application image

The primary duty of Wave Circlips (Crescent Rings) is axial retention of components on shafts and in bores. Below: the sectors that specify them in volume, the checklist used to select the right size and material for the application, installation notes, and the known limits of the type.

Typical Applications for Wave Circlips (Crescent Rings)

The most common settings where these are specified:

  • 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.
  • Automotive driveline: axial location on rotating shafts.
  • General machine building: fastening covers, brackets, motors and sub-assemblies on production equipment.

How to Specify Wave Circlips (Crescent Rings) for Your Application

  • Size: Match the size to the mating part — see the dimension table below for each option.
  • 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 Trade series (wave and crescent retaining rings). 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 Wave Circlips (Crescent Rings)

  • 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 Wave Circlips (Crescent Rings) Are Not the Right Choice

Not for heavy axial thrust beyond the groove rating, and not where the groove cannot be machined to spec.

Technical Drawing

Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.

Sends the selected values to the quote form below.

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The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.

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Specification
Business Information

Dimensions & Specifications (Trade series (wave and crescent retaining rings))

FormFitsWhat it adds over a flat ringTypical use
wave ring, externalshaft grooveaxial spring preload, removes end floatbearing and gear trains
wave ring, internalbore grooveaxial spring preload, removes end floathousings and bearing bores
crescent ring, externalshaft groovelow profile, small radial clearance neededtight radial envelopes
Inside the plant

Manufactured in our own plant

This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.

  1. Wire rod feeding into a cold heading machine
    01

    Cold heading

    Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.

    Head dimensions and under-head radius checked at set-up and per shift.

  2. Thread rolling machine producing bolt threads
    02

    Thread rolling

    Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.

    Go / no-go ring gauges to ISO 965 tolerance class 6g.

  3. Baskets of bolts staged for heat treatment
    03

    Heat treatment

    Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.

    Core hardness and tensile tested per lot to ISO 898-1.

  4. Zinc plated bolts in a treatment basket
    04

    Surface treatment

    Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.

    Coating thickness and neutral salt spray hours to ISO 9227.

Frequently Asked Questions

How do I choose the right size of Wave Circlips (Crescent Rings)?

Match the size to the mating part using the dimension table on this page.

How much axial load can Wave Circlips (Crescent Rings) hold?

Retention depends on the groove dimensions and ring thickness. Stay within the rated thrust load and make sure the groove is machined to the specified diameter and width.

What material should Wave Circlips (Crescent Rings) be for outdoor use?

For damp, coastal or chemical environments specify A4 (316) stainless or a suitably coated steel. For indoor or dry use, A2 (304) stainless or zinc-plated steel is normally adequate.

Are Wave Circlips (Crescent Rings) made to a recognized standard?

Yes — they are manufactured to Trade series (wave and crescent retaining rings), so dimensions are interchangeable between suppliers when you quote the standard on your order.

Can I get a quote for Wave Circlips (Crescent Rings) in the size and material I need?

Yes. Use the technical drawing and quote form on this page to set the size and options, then send the exact configuration to our team for pricing and lead time.