Internal circlip 9 mm
DIN 472 Internal circlip 9 mm - Carbon Spring Steel
9 mm
bore
Technical specification
| Standard | DIN 472 |
|---|---|
| Type | Internal circlips |
| Nominal size | 9 mm bore |
| Measured on | bore |
| Material | Carbon spring steel |
| Pack quantity | 25 pieces |
| Axial SKU | AX-472-9-CS-25 |
| Availability | Available to order |
£5.60
Pack of 25 · No VAT charged
Available to order
25 pieces · £5.60
Sold by the pack of 25. No VAT charged on any order.
Need a size that is not listed? Ask the trade desk.
About this part
A 9 mm internal circlip is the ring for a 9 mm bore. It is compressed to pass into the housing and springs outwards into a groove machined in the bore wall, where the part standing proud forms a shoulder that holds a bearing or bush in from within. The 9 mm refers to the bore, not to any dimension of the ring — its free diameter is larger.
DIN 472 fixes the groove for this size: 9.4 mm groove diameter, 0.9 mm wide, taking a ring 0.8 mm thick, with at least 0.6 mm between the groove and the end of the bore. Those are the numbers to machine to and to check an existing groove against — if what you measure disagrees, either the surface is wrong or the part is not to DIN 472.
The neighbouring sizes are 8 mm and 10 mm. Reach for one of those only because you measured the bore and got that number — not because this ring feels tight or slack in the hand. A ring that seems slightly loose is usually a worn groove rather than a wrong size, and going up a size to take up the slack puts a ring in a groove it was never dimensioned for. If your measurement falls between 8 mm and 9 mm, clean the bore and measure again before choosing: dirt and old paint read as diameter.
Groove dimensions to DIN 472
Fixed by the standard, not by us. Machine the groove to these and the ring seats correctly; check them against your drawing before cutting.
Source: Aspen Fasteners, fasteners.eu and Springmasters Ltd, which agree on this size.
| Groove diameter d2 | 9.4 mm |
|---|---|
| Groove width m | 0.9 mm |
| Ring thickness s | 0.8 mm |
| Min. edge margin n | 0.6 mm |
Edge margin is the minimum distance from the groove to the end of the shaft or bore. Cutting closer removes the material that resists shearing at full load. Full DIN 472 table.
Check the specification before ordering
Retaining rings are dimension-critical. Confirm the groove diameter, groove width and ring thickness against the applicable standard for your application. Safety-critical assemblies need independent engineering verification.
Before you order
- How to measure for a circlip — measure the bore, not the old ring
- DIN 472 explained — what the nominal size refers to
- Fitting and removing circlips — pliers, seating and safety
bore circlips, housing circlips, internal retaining rings, internal snap rings, Seeger rings — all the same part, listed here by the bore it fits.
Photographs show a representative part from the DIN 472 range. Dimensions are governed by the standard, not by the photograph.
Nearby sizes
Same family and standard, adjacent nominal sizes.