DIN 471 dimensions
Groove and ring dimensions for retaining rings for shafts. The nominal size is the shaft diameter — never a dimension of the ring itself.
| Nominal | Groove Ø | Groove width | Thickness | Edge margin | Stocked |
|---|---|---|---|---|---|
| 3 | 2.8 | 0.5 | 0.4 | 0.3 | yes |
| 4 | 3.8 | 0.5 | 0.4 | 0.3 | yes |
| 5 | 4.8 | 0.7 | 0.6 | 0.3 | yes |
| 6 | 5.7 | 0.8 | 0.7 | 0.5 | yes |
| 7 | 6.7 | 0.9 | 0.8 | 0.5 | yes |
| 8 * | 7.6 | 0.9 | 0.8 | 0.6 | yes |
| 9 | 8.6 | 1.1 | 1 | 0.6 | yes |
| 10 | 9.6 | 1.1 | 1 | 0.6 | yes |
| 11 | 10.5 | 1.1 | 1 | 0.8 | yes |
| 12 | 11.5 | 1.1 | 1 | 0.8 | yes |
| 13 | 12.4 | 1.1 | 1 | 0.9 | yes |
| 14 | 13.4 | 1.1 | 1 | 0.9 | yes |
| 15 | 14.3 | 1.1 | 1 | 1.1 | yes |
| 16 | 15.2 | 1.1 | 1 | 1.2 | yes |
| 17 | 16.2 | 1.1 | 1 | 1.2 | yes |
| 18 | 17 | 1.3 | 1.2 | 1.5 | yes |
| 19 | 18 | 1.3 | 1.2 | 1.5 | yes |
| 20 | 19 | 1.3 | 1.2 | 1.5 | yes |
| 21 | 20 | 1.3 | 1.2 | 1.5 | yes |
| 22 | 21 | 1.3 | 1.2 | 1.5 | yes |
| 24 | 22.9 | 1.3 | 1.2 | 1.7 | yes |
| 25 | 23.9 | 1.3 | 1.2 | 1.7 | yes |
| 26 | 24.9 | 1.3 | 1.2 | 1.7 | yes |
| 28 | 26.6 | 1.6 | 1.5 | 2.1 | — |
| 29 | 27.6 | 1.6 | 1.5 | 2.1 | — |
| 30 | 28.6 | 1.6 | 1.5 | 2.1 | — |
All values in millimetres. Tolerances are given in the standard and are not reproduced here. * marks a size our sources do not agree on — see below.
Where the sources disagree
8 mm — Springmasters publish a different groove width
Springmasters' product page for the 8 mm ring gives a groove width of 1.1 mm where both of our references give 0.9 mm. Every other figure for the size agrees, including the 0.8 mm ring thickness — and a 1.1 mm groove is the value the standard gives for 9 mm, which is what a row read one line low would produce. We publish 0.9 mm because two independent sources give it and one does not, but the figure is not settled: measure the groove, or take it from the standard, before machining to either number.
Sizes DIN 471 does not define
The standard does not step in whole millimetres throughout. There is no 23 mm and no 27 mm ring in DIN 471, so nothing sold under those sizes has published groove dimensions. If a drawing calls for one, it is either a different standard or a special.
Common questions
What is the groove diameter for a 16 mm DIN 471 ring?
15.2 mm, with a groove width of 1.1 mm and a ring thickness of 1 mm. The full table for every DIN 471 size is on this page.
Is there a 23 mm DIN 471 ring?
No. DIN 471 does not define 23 mm, 27 mm. The standard steps 22 mm straight to 24 mm. Anything sold as that size is not made to DIN 471 and has no published groove dimensions.
Do sources agree on every DIN 471 figure?
Not at 8 mm. Aspen Fasteners and the DIN 471:2011 designation list give a groove width of 0.9 mm; Springmasters publish 1.1 mm. We publish 0.9 mm because two independent sources give it, and flag the size rather than averaging the two.
What does edge margin mean?
The minimum distance from the groove to the end of the shaft or bore. It is calculated to leave enough material to resist shearing at the ring's full rated load. Cutting a groove closer to the end than the standard allows changes the failure mode to the shaft end shearing away.
Does the nominal size mean the ring diameter?
No. For DIN 471 the nominal size is the shaft diameter the ring fits, not a dimension of the ring itself. Measuring an old ring across its widest point gives a number that appears nowhere in this table.
Sources
Taken from a published manufacturer specification and checked against a second, independent one. Since confirmed a third time against Springmasters' own published product data, which agrees on every size except 8 mm — see the note on that size.
Checked again on 2026-08-17 against Springmasters' published product data: 22 of 23 sizes agree on all four figures. The exception is set out above.
Nothing is interpolated. Check against the standard itself, or your drawing, before machining.