For retaining rings (circlips), DIN 471 defines the dimensions, tolerances and product grades. The sections below describe the scope of the document, the properties it deliberately leaves to companion standards, and the equivalent designations across standards bodies.
DIN 471 — Scope
DIN 471 specifies the dimensions and tolerances of retaining rings (circlips). Material, property class, surface finish and packaging are governed by separate documents in the same standards family (for example ISO 898-1 for the mechanical property classes of bolts and screws).
Tolerance & Product Grades
DIN 471, alongside the related DIN 471 / DIN 472 entries on this site, specifies product grades (typically A or B for fine work and C for general engineering) and tolerance classes for the controlling dimensions. Choose the grade against the precision your application requires.
Dimensions Specified by DIN 471
| Nominal diameter (mm) | Ring diameter d1 (mm) | Groove diameter d2 (mm) | Thickness s (mm) | Groove depth ref (mm) | Type / standard |
|---|---|---|---|---|---|
| 3 | 2.7 | 2.5 | 0.4 | 3.5 | DIN 471 external |
| 4 | 3.7 | 3.4 | 0.4 | 4.5 | DIN 471 external |
| 5 | 4.7 | 4.4 | 0.6 | 5.5 | DIN 471 external |
| 6 | 5.6 | 5.3 | 0.7 | 6.5 | DIN 471 external |
| 7 | 6.5 | 6.2 | 0.8 | 7.5 | DIN 471 external |
| 8 | 7.4 | 7.1 | 0.8 | 8.5 | DIN 471 external |
| 9 | 8.4 | 8.1 | 1.0 | 9.5 | DIN 471 external |
| 10 | 9.3 | 9.0 | 1.0 | 10.5 | DIN 471 external |
| 11 | 10.2 | 9.9 | 1.0 | 11.5 | DIN 471 external |
| 12 | 11.1 | 10.8 | 1.0 | 12.5 | DIN 471 external |
| 14 | 13.0 | 12.7 | 1.0 | 14.5 | DIN 471 external |
| 15 | 14.0 | 13.7 | 1.0 | 15.5 | DIN 471 external |
| 16 | 15.0 | 14.7 | 1.0 | 16.5 | DIN 471 external |
| 17 | 16.0 | 15.7 | 1.0 | 17.5 | DIN 471 external |
| 18 | 17.0 | 16.7 | 1.2 | 18.5 | DIN 471 external |
| 19 | 18.0 | 17.7 | 1.2 | 19.5 | DIN 471 external |
| 20 | 19.0 | 18.7 | 1.2 | 20.5 | DIN 471 external |
| 22 | 21.0 | 20.7 | 1.2 | 22.5 | DIN 471 external |
| 24 | 22.9 | 22.6 | 1.2 | 24.5 | DIN 471 external |
| 25 | 23.9 | 23.6 | 1.2 | 25.5 | DIN 471 external |
| 28 | 26.9 | 26.6 | 1.5 | 29.0 | DIN 471 external |
| 30 | 28.9 | 28.6 | 1.5 | 31.0 | DIN 471 external |
| 32 | 30.9 | 30.6 | 1.5 | 33.0 | DIN 471 external |
| 35 | 33.8 | 33.5 | 1.5 | 36.0 | DIN 471 external |
| 40 | 38.5 | 38.2 | 1.75 | 41.0 | DIN 471 external |
| 45 | 43.5 | 43.2 | 1.75 | 46.0 | DIN 471 external |
| 50 | 48.5 | 48.2 | 2.0 | 51.0 | DIN 471 external |
| 55 | 53.3 | 53.0 | 2.0 | 56.5 | DIN 471 external |
| 60 | 58.3 | 58.0 | 2.0 | 61.5 | DIN 471 external |
| 65 | 63.3 | 63.0 | 2.5 | 67.0 | DIN 471 external |
| 70 | 68.3 | 68.0 | 2.5 | 72.0 | DIN 471 external |
| 75 | 73.3 | 73.0 | 2.5 | 77.0 | DIN 471 external |
| 80 | 78.0 | 77.7 | 2.5 | 82.0 | DIN 471 external |
| 85 | 83.0 | 82.7 | 3.0 | 87.0 | DIN 471 external |
| 90 | 88.0 | 87.7 | 3.0 | 92.0 | DIN 471 external |
| 95 | 93.0 | 92.7 | 3.0 | 97.0 | DIN 471 external |
| 100 | 98.0 | 97.7 | 3.0 | 102.0 | DIN 471 external |
| 8 | 8.4 | 8.7 | 0.8 | 7.5 | DIN 472 internal |
| 9 | 9.4 | 9.7 | 1.0 | 8.5 | DIN 472 internal |
| 10 | 10.4 | 10.7 | 1.0 | 9.5 | DIN 472 internal |
| 11 | 11.4 | 11.7 | 1.0 | 10.4 | DIN 472 internal |
| 12 | 12.5 | 12.8 | 1.0 | 11.4 | DIN 472 internal |
| 13 | 13.5 | 13.8 | 1.0 | 12.4 | DIN 472 internal |
| 14 | 14.5 | 14.8 | 1.0 | 13.4 | DIN 472 internal |
| 15 | 15.5 | 15.8 | 1.0 | 14.3 | DIN 472 internal |
| 16 | 16.5 | 16.8 | 1.0 | 15.3 | DIN 472 internal |
| 17 | 17.5 | 17.8 | 1.0 | 16.3 | DIN 472 internal |
| 18 | 18.5 | 18.8 | 1.2 | 17.2 | DIN 472 internal |
| 19 | 19.5 | 19.8 | 1.2 | 18.2 | DIN 472 internal |
| 20 | 20.5 | 20.8 | 1.2 | 19.2 | DIN 472 internal |
| 22 | 22.5 | 22.9 | 1.2 | 21.2 | DIN 472 internal |
| 24 | 24.5 | 24.9 | 1.2 | 23.2 | DIN 472 internal |
| 25 | 25.5 | 25.9 | 1.2 | 24.2 | DIN 472 internal |
| 28 | 28.6 | 29.0 | 1.5 | 27.0 | DIN 472 internal |
| 30 | 30.6 | 31.0 | 1.5 | 29.0 | DIN 472 internal |
| 32 | 32.6 | 33.0 | 1.5 | 31.0 | DIN 472 internal |
| 35 | 35.7 | 36.1 | 1.5 | 34.0 | DIN 472 internal |
| 40 | 40.8 | 41.3 | 1.75 | 39.0 | DIN 472 internal |
| 45 | 45.8 | 46.3 | 1.75 | 44.0 | DIN 472 internal |
| 50 | 51.0 | 51.5 | 2.0 | 49.0 | DIN 472 internal |
| 55 | 56.0 | 56.5 | 2.0 | 54.0 | DIN 472 internal |
| 60 | 61.0 | 61.5 | 2.0 | 59.0 | DIN 472 internal |
| 65 | 66.2 | 66.8 | 2.5 | 64.0 | DIN 472 internal |
| 70 | 71.2 | 71.8 | 2.5 | 69.0 | DIN 472 internal |
| 75 | 76.2 | 76.8 | 2.5 | 74.0 | DIN 472 internal |
| 80 | 81.2 | 81.8 | 2.5 | 79.0 | DIN 472 internal |
| 85 | 86.5 | 87.1 | 3.0 | 84.0 | DIN 472 internal |
| 90 | 91.5 | 92.1 | 3.0 | 89.0 | DIN 472 internal |
| 95 | 96.5 | 97.1 | 3.0 | 94.0 | DIN 472 internal |
| 100 | 101.5 | 102.1 | 3.0 | 99.0 | DIN 472 internal |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Retaining Rings (Circlips) page. Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify DIN 471
DIN 471 is still widely used in European mechanical engineering and as a cross-reference on legacy drawings; its ISO equivalent is preferred for new designs.