Internal circlips — DIN 472
Internal circlips to DIN 472 fit into a groove machined inside a housing or bore, retaining bearings and bushes from within. The nominal size quoted is the bore diameter, so a 20 mm internal circlip fits a 20 mm bore. They are fitted with circlip pliers that close rather than open, which is the usual reason an external ring will not do the job.
Also sold as bore circlips, housing circlips, internal retaining rings, internal snap rings, Seeger rings.
- DIN 472
- 8 mm to 31 mm
- £5.05 per pack of 25
All internal circlips
Prices are per pack. No VAT charged.
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Counts update as filters are applied. Sizes with no matching parts are hidden.
Showing 21 of 21 parts
All 21 lines are Available to order
| Pack | Add to basket | ||
|---|---|---|---|
| 8mm8 | 25 | £5.05 | |
| 9mm9 | 25 | £5.60 | |
| 10mm10 | 25 | £6.20 | |
| 11mm11 | 25 | £6.80 | |
| 12mm12 | 25 | £7.15 | |
| 13mm13 | 25 | £7.55 | |
| 14mm14 | 25 | £8.15 | |
| 15mm15 | 25 | £8.70 | |
| 16mm16 | 25 | £8.70 | |
| 17mm17 | 25 | £9.50 | |
| 18mm18 | 25 | £10.10 | |
| 19mm19 | 25 | £10.65 | |
| 20mm20 | 25 | £11.25 | |
| 21mm21 | 25 | £11.65 | |
| 22mm22 | 25 | £12.20 | |
| 24mm24 | 10 | £5.20 | |
| 25mm25 | 10 | £5.45 | |
| 26mm26 | 10 | £5.65 | |
| 28mm28 | 10 | £6.05 | |
| 30mm30 | 10 | £6.50 | |
| 31mm31 | 10 | £6.75 |
All dimensions in millimetres, from the tables at /reference, each of which names its source. The pack and price shown are the ones we hold; every size is also available in packs of 10, 25 and 50 — choose on the part's own page. No VAT charged. Retaining rings are dimension-critical — check the groove against your drawing before ordering.
We publish no product photography. A photograph of a 12 mm circlip is indistinguishable from one of a 14 mm circlip, so the dimensions above are the thing that tells you whether a line is the one you want — and every figure in the table names its source at /reference.
Common questions
What size internal circlip do I need?
Internal circlips to DIN 472 are listed by the bore diameter they fit, so a 20 mm circlip is the ring for a 20 mm bore. Measure the bore beside the groove rather than the old ring, whose free diameter is smaller than the nominal size.
Can I use an external circlip in a bore?
No. External rings are sized and sprung to be expanded over a shaft; internal rings are sized and sprung to be compressed into a bore. They work in opposite directions and are not interchangeable in either place.
Which pliers fit internal circlips?
Internal circlip pliers, which draw the ring's lug holes together so it can pass into the bore. This is the usual reason a set of external pliers will not do the job.
Do you supply sizes that are not listed?
Yes. Imperial sizes, obsolete references and production quantities are handled through the trade desk. Send the bore diameter, groove width and quantity and we will identify the part.
Guides
Reference notes on specifying and fitting internal circlips.
DIN 471, DIN 472 and DIN 6799 explained
Three standards cover almost every metric retaining ring you will meet. Picking the wrong one is usually a matter of measuring the wrong surface, not of choosing the wrong part.
How to measure for a circlip
The ring you pulled out is the least reliable thing to measure. Measure the feature it sits in, and the size falls out of the standard.
Fitting and removing circlips safely
Most circlip failures are fitting failures. A ring that was over-expanded on the way in will not hold, however right the part number was.
Circlip materials and finishes
Carbon spring steel does almost every job. The cases where it does not are predictable, and they are worth knowing before the assembly is closed up.
How much load can a circlip take?
The ring is rarely the weak part. In almost every failure the groove yields first, and the ring only dishes and rolls out afterwards as a consequence.
Other families
Cannot find the size?
Send the shaft, bore or groove dimensions and the quantity you need. Imperial sizes, older references and parts identified from a drawing or sample are all handled through the trade desk.
Send a trade enquiry