Pick shaft or bore and enter the nominal size or a designation. Without the size, enter a measured groove diameter (matched within 0.15 mm), or the ring thickness with a rough diameter in the first field. Below, an offered ring can be checked against it: the standard, the size and the thickness.
On the designation alone: the material and finish are checked separately.
Circlips hold bearings, gears and sleeves in pumps, compressors and gearboxes. A circlip for a shaft is DIN 471, one for a bore DIN 472. Pick where the ring sits and enter the nominal size (25, DIN 471 25x1.2, J 40), a measured groove diameter, or the ring thickness with a rough diameter: the finder gives the row of the standard, with the ring thickness, the groove diameter and width and the free diameter, draws the ring in its groove to scale, checks an offered ring and writes an RFQ line.
The material, finish and tolerances are not read here: give them in the request or take them from the maker’s catalogue.
DIN 471 is the external ring for a shaft: the groove is cut into the shaft and the ring is spread to fit. DIN 472 is the internal ring for a bore: the groove is cut into the bore wall and the ring is squeezed to fit. At the same nominal size they are different rings.
The groove diameter d2 is measured at the bottom of the groove, the width m between its walls. On a shaft the groove is smaller than the nominal size, in a bore larger; half the difference is the groove depth. The groove is a little wider than the ring is thick.
The thickness s is the dimension to check with a caliper. The free diameter d3 is the diameter of the ring before fitting: smaller than the groove on a shaft ring, larger on a bore ring, which is what holds the ring in its groove.
| Standard · size d1 | Thickness s | Groove d2 | Groove width m | Free d3 |
|---|---|---|---|---|
| DIN 471 · 4 | 0.4 | 3.8 | 0.5 | 3.7 |
| DIN 471 · 5 | 0.6 | 4.8 | 0.7 | 4.7 |
| DIN 471 · 6 | 0.7 | 5.7 | 0.8 | 5.6 |
| DIN 471 · 7 | 0.8 | 6.7 | 0.9 | 6.5 |
| DIN 471 · 8 | 0.8 | 7.6 | 0.9 | 7.4 |
| DIN 471 · 9 | 1 | 8.6 | 1.1 | 8.4 |
| DIN 471 · 10 | 1 | 9.6 | 1.1 | 9.3 |
| DIN 471 · 12 | 1 | 11.5 | 1.1 | 11 |
| DIN 471 · 14 | 1 | 13.4 | 1.1 | 12.9 |
| DIN 471 · 15 | 1 | 14.3 | 1.1 | 13.8 |
| DIN 471 · 16 | 1 | 15.2 | 1.1 | 14.7 |
| DIN 471 · 17 | 1 | 16.2 | 1.1 | 15.7 |
| DIN 471 · 18 | 1.2 | 17 | 1.3 | 16.5 |
| DIN 471 · 19 | 1.2 | 18 | 1.3 | 17.5 |
| DIN 471 · 20 | 1.2 | 19 | 1.3 | 18.5 |
| DIN 471 · 22 | 1.2 | 21 | 1.3 | 20.5 |
| DIN 471 · 24 | 1.2 | 22.9 | 1.3 | 22.2 |
| DIN 471 · 25 | 1.2 | 23.9 | 1.3 | 23.2 |
| DIN 471 · 26 | 1.2 | 24.9 | 1.3 | 24.2 |
| DIN 471 · 28 | 1.5 | 26.6 | 1.6 | 25.9 |
| DIN 471 · 30 | 1.5 | 28.6 | 1.6 | 27.9 |
| DIN 471 · 32 | 1.5 | 30.3 | 1.6 | 29.6 |
| DIN 471 · 35 | 1.5 | 33 | 1.6 | 32.2 |
| DIN 471 · 38 | 1.75 | 36 | 1.85 | 35.2 |
| DIN 471 · 40 | 1.75 | 37.5 | 1.85 | 36.5 |
| DIN 471 · 45 | 1.75 | 42.5 | 1.85 | 41.5 |
| DIN 471 · 50 | 2 | 47 | 2.15 | 45.8 |
| DIN 471 · 55 | 2 | 52 | 2.15 | 50.8 |
| DIN 471 · 60 | 2 | 57 | 2.15 | 55.8 |
| DIN 471 · 75 | 2.5 | 72 | 2.65 | 70.5 |
| DIN 472 · 8 | 0.8 | 8.4 | 0.9 | 8.7 |
| DIN 472 · 9 | 0.8 | 9.4 | 0.9 | 9.8 |
| DIN 472 · 10 | 1 | 10.4 | 1.1 | 10.8 |
| DIN 472 · 12 | 1 | 12.5 | 1.1 | 13 |
| DIN 472 · 14 | 1 | 14.6 | 1.1 | 15.1 |
| DIN 472 · 15 | 1 | 15.7 | 1.1 | 16.2 |
| DIN 472 · 16 | 1 | 16.8 | 1.1 | 17.3 |
| DIN 472 · 17 | 1 | 17.8 | 1.1 | 18.3 |
| DIN 472 · 18 | 1 | 19 | 1.1 | 19.5 |
| DIN 472 · 19 | 1 | 20 | 1.1 | 20.5 |
| DIN 472 · 20 | 1 | 21 | 1.1 | 21.5 |
| DIN 472 · 22 | 1 | 23 | 1.1 | 23.5 |
| DIN 472 · 24 | 1.2 | 25.2 | 1.3 | 25.9 |
| DIN 472 · 25 | 1.2 | 26.2 | 1.3 | 26.9 |
| DIN 472 · 26 | 1.2 | 27.2 | 1.3 | 27.9 |
| DIN 472 · 28 | 1.2 | 29.4 | 1.3 | 30.1 |
| DIN 472 · 30 | 1.2 | 31.4 | 1.3 | 32.1 |
| DIN 472 · 32 | 1.2 | 33.7 | 1.3 | 34.4 |
| DIN 472 · 35 | 1.5 | 37 | 1.6 | 37.8 |
| DIN 472 · 38 | 1.5 | 40 | 1.6 | 40.8 |
| DIN 472 · 40 | 1.75 | 42.5 | 1.85 | 43.5 |
| DIN 472 · 45 | 1.75 | 47.5 | 1.85 | 48.5 |
| DIN 472 · 47 | 1.75 | 49.5 | 1.85 | 50.5 |
| DIN 472 · 50 | 2 | 53 | 2.15 | 54.2 |
| DIN 472 · 55 | 2 | 58 | 2.15 | 59.2 |
| DIN 472 · 60 | 2 | 63 | 2.15 | 64.2 |
| DIN 472 · 75 | 2.5 | 78 | 2.65 | 79.5 |
All dimensions in millimetres. Sizes not in the table are not given here; other sizes: the maker’s catalogue. Sizes above 75 mm are left out: the sources do not agree there or do not list them. Tolerances, the radial width of the ring and the lug dimensions are left out too.
DIN 471: the norelem catalogue sheet 07330 and the DIN 471 table published by fasten.it; DIN 472: the norelem catalogue sheet 07331 and the DIN 472 table published by fasten.it. Every row in the table is the same in both sources. The letters A and J are read only as a shaft ring and a bore ring.
A DIN 471 circlip goes on a shaft: it sits in a groove cut into the shaft, and before fitting its inside diameter d3 is smaller than the groove, so it grips it. A DIN 472 circlip goes in a bore: the groove is cut into the bore wall, and before fitting its outside diameter d3 is larger than the groove. The two do not replace each other, even at the same nominal size.
Measure the shaft or the bore: that is the nominal size d1. With the ring out, measure the groove diameter d2 at the bottom of the groove and the ring thickness s with a caliper. The finder matches a groove within 0.15 mm, and a thickness with a rough diameter. The groove is the safer measure, as a ring that has been removed may be bent.
A size written as A 25 or J 40 is a common catalogue style: A for a ring on a shaft (external), J for a ring in a bore (internal). The finder reads A as DIN 471 and J as DIN 472 and nothing more; the maker’s catalogue decides the exact ring.
The standard (DIN 471 for a shaft or DIN 472 for a bore), the nominal size, the ring thickness, the groove diameter if you measured it, the material if it is known, the quantity, and a photograph of the ring in its groove.
A row of the standard is a cross-check of sizes, not a ring selection. Attach the photograph and your measurements, and Vessel Core checks them before an offer goes back.
