This is the complete dimension chart for DIN 471 external circlips (retaining rings for shafts), covering every standard size from Ø4 mm to Ø300 mm. It lists the dimensions a designer or machinist actually needs: ring thickness, free inner diameter, groove diameter, groove width, and groove depth - the same data as the DIN standard's dimension tables, in one searchable page.
If you're not sure whether you need an external (DIN 471) or internal (DIN 472) ring, start with our DIN 471 vs DIN 472 guide. For bore circlips, see the companion DIN 472 internal circlip size chart.
How to Read the Chart
- Nominal size d₁ - the shaft diameter. A 25 mm shaft takes a DIN 471-25. This is the size you order.
- Thickness s - the axial thickness of the ring itself.
- Free I.D. d₃ - the inner diameter of the loose, unstressed ring. It is smaller than the groove diameter so the installed ring grips the shaft. Use it to identify an unmarked ring with callipers - it is not a machining dimension.
- Groove Ø d₂ - the diameter the groove is machined to on the shaft, with tolerance h11.
- Groove width m (min) - the minimum axial width of the groove. It is slightly wider than the ring thickness so the ring seats freely.
- Groove depth t - the radial depth of the groove per side, equal to (d₁ − d₂) / 2.
Quick rule: order by shaft diameter, machine the groove to d₂ (h11). The nominal circlip size is never the groove diameter - specifying the groove diameter as the size is the most common ordering mistake.
DIN 471 Size Chart (Ø4 - Ø300 mm)
All dimensions in mm. Sizes up to Ø200 are stocked ex-Mumbai in spring steel (most also in SS 304 / SS 316); Ø205-Ø300 are supplied on order.
| Shaft Ø d₁ | Thickness s | Free I.D. d₃ | Groove Ø d₂ (h11) | Groove width m (min) | Groove depth t |
|---|---|---|---|---|---|
| 4 | 0.4 | 3.7 | 3.8 | 0.5 | 0.1 |
| 5 | 0.6 | 4.7 | 4.8 | 0.7 | 0.1 |
| 6 | 0.7 | 5.6 | 5.7 | 0.8 | 0.15 |
| 7 | 0.8 | 6.5 | 6.7 | 0.9 | 0.15 |
| 8 | 0.8 | 7.4 | 7.6 | 0.9 | 0.2 |
| 9 | 1 | 8.4 | 8.6 | 1.1 | 0.2 |
| 10 | 1 | 9.3 | 9.6 | 1.1 | 0.2 |
| 11 | 1 | 10.2 | 10.5 | 1.1 | 0.25 |
| 12 | 1 | 11.0 | 11.5 | 1.1 | 0.25 |
| 13 | 1 | 11.9 | 12.4 | 1.1 | 0.3 |
| 14 | 1 | 12.9 | 13.4 | 1.1 | 0.3 |
| 15 | 1 | 13.8 | 14.3 | 1.1 | 0.35 |
| 16 | 1 | 14.7 | 15.2 | 1.1 | 0.4 |
| 17 | 1 | 15.7 | 16.2 | 1.1 | 0.4 |
| 18 | 1.2 | 16.5 | 17.0 | 1.3 | 0.5 |
| 19 | 1.2 | 17.5 | 18.0 | 1.3 | 0.5 |
| 20 | 1.2 | 18.5 | 19.0 | 1.3 | 0.5 |
| 21 | 1.2 | 19.5 | 20.0 | 1.3 | 0.5 |
| 22 | 1.2 | 20.5 | 21.0 | 1.3 | 0.5 |
| 24 | 1.2 | 22.2 | 22.9 | 1.3 | 0.55 |
| 25 | 1.2 | 23.2 | 23.9 | 1.3 | 0.55 |
| 26 | 1.2 | 24.2 | 24.9 | 1.3 | 0.55 |
| 28 | 1.5 | 25.9 | 26.6 | 1.6 | 0.7 |
| 30 | 1.5 | 27.9 | 28.6 | 1.6 | 0.7 |
| 32 | 1.5 | 29.6 | 30.3 | 1.6 | 0.85 |
| 34 | 1.5 | 31.4 | 32.3 | 1.6 | 0.85 |
| 35 | 1.5 | 32.2 | 33.0 | 1.6 | 1 |
| 36 | 1.75 | 33.2 | 34.0 | 1.85 | 1 |
| 38 | 1.75 | 35.2 | 36.0 | 1.85 | 1 |
| 40 | 1.75 | 36.5 | 37.5 | 1.85 | 1.25 |
| 42 | 1.75 | 38.5 | 39.5 | 1.85 | 1.25 |
| 45 | 1.75 | 41.5 | 42.5 | 1.85 | 1.25 |
| 47 | 1.75 | 43.5 | 44.5 | 1.85 | 1.25 |
| 48 | 1.75 | 44.5 | 45.5 | 1.85 | 1.25 |
| 50 | 2 | 45.8 | 47.0 | 2.15 | 1.5 |
| 52 | 2 | 47.8 | 49.0 | 2.15 | 1.5 |
| 55 | 2 | 50.8 | 52.0 | 2.15 | 1.5 |
| 58 | 2 | 53.8 | 55.0 | 2.15 | 1.5 |
| 60 | 2 | 55.8 | 57.0 | 2.15 | 1.5 |
| 62 | 2 | 57.8 | 59.0 | 2.15 | 1.5 |
| 65 | 2.5 | 60.8 | 62.0 | 2.65 | 1.5 |
| 68 | 2.5 | 63.5 | 65.0 | 2.65 | 1.5 |
| 70 | 2.5 | 65.5 | 67.0 | 2.65 | 1.5 |
| 72 | 2.5 | 67.5 | 69.0 | 2.65 | 1.5 |
| 75 | 2.5 | 70.5 | 72.0 | 2.65 | 1.5 |
| 78 | 2.5 | 73.5 | 75.0 | 2.65 | 1.5 |
| 80 | 2.5 | 74.5 | 76.5 | 2.65 | 1.75 |
| 82 | 2.5 | 76.5 | 78.5 | 2.65 | 1.75 |
| 85 | 3 | 79.5 | 81.5 | 3.15 | 1.75 |
| 90 | 3 | 84.5 | 86.5 | 3.15 | 1.75 |
| 95 | 3 | 89.5 | 91.5 | 3.15 | 1.75 |
| 100 | 3 | 94.5 | 96.5 | 3.15 | 1.75 |
| 105 | 4 | 98.0 | 101.0 | 4.15 | 2 |
| 110 | 4 | 103.0 | 106.0 | 4.15 | 2 |
| 115 | 4 | 108.0 | 111.0 | 4.15 | 2 |
| 120 | 4 | 113.0 | 116.0 | 4.15 | 2 |
| 125 | 4 | 118.0 | 121.0 | 4.15 | 2 |
| 130 | 4 | 123.0 | 126.0 | 4.15 | 2 |
| 135 | 4 | 128.0 | 131.0 | 4.15 | 2 |
| 140 | 4 | 134.0 | 136.0 | 4.15 | 2 |
| 145 | 4 | 138.0 | 141.0 | 4.15 | 2 |
| 150 | 4 | 142.0 | 145.0 | 4.15 | 2.5 |
| 160 | 4 | 151.0 | 155.0 | 4.15 | 2.5 |
| 170 | 4 | 160.0 | 165.0 | 4.15 | 2.5 |
| 180 | 4 | 170.0 | 175.0 | 4.15 | 2.5 |
| 190 | 4 | 180.5 | 185.0 | 4.15 | 2.5 |
| 200 | 4 | 190.5 | 195.0 | 4.15 | 2.5 |
| 205 | 5 | 193.0 | 199.0 | 5.15 | 3 |
| 210 | 5 | 198.0 | 204.0 | 5.15 | 3 |
| 220 | 5 | 208.0 | 214.0 | 5.15 | 3 |
| 230 | 5 | 218.0 | 224.0 | 5.15 | 3 |
| 240 | 5 | 228.0 | 234.0 | 5.15 | 3 |
| 250 | 5 | 238.0 | 244.0 | 5.15 | 3 |
| 260 | 5 | 245.0 | 252.0 | 5.15 | 4 |
| 270 | 5 | 255.0 | 262.0 | 5.15 | 4 |
| 280 | 5 | 265.0 | 272.0 | 5.15 | 4 |
| 290 | 5 | 275.0 | 282.0 | 5.15 | 4 |
| 300 | 5 | 285.0 | 292.0 | 5.15 | 4 |
Ring thickness and free diameter per DIN 471, cross-checked against our stocked range. Groove dimensions per the DIN 471 dimension tables; groove depth t = (d₁ − d₂) / 2. For sizes between these, contact us.
Worked Example: Ø25 mm Shaft
Say your drawing shows a gear retained on a 25 mm shaft:
- Order: DIN 471-25 (or IS 3075, 25 mm external).
- Machine the groove: diameter 23.9 mm to h11, minimum width 1.3 mm.
- Check depth: t = (25 − 23.9) / 2 = 0.55 mm per side.
- Install: external circlip pliers expand the 1.2 mm-thick ring over the shaft end into the groove.
Groove Machining Notes
- Groove diameter tolerance is h11 - the groove may be at or slightly under nominal d₂, never over. An oversize groove reduces ring grip and load capacity.
- Groove width is a minimum: the ring must seat with slight axial clearance. A groove narrower than m will not accept the ring; an excessively wide groove allows axial play in the retained component.
- Sharp groove corners - the ring seats against the groove wall. Excessive corner radii reduce the effective bearing area and the ring's load rating.
- Edge distance - leave sufficient shaft material between the groove and the shaft end, per the standard, or the shoulder can shear under load.
Material Options
Standard DIN 471 circlips are stamped from spring steel (65Mn or equivalent, phosphated). For corrosive environments we stock SS 304 external circlips ex-Mumbai, with SS 316 available on request for marine and chemical plant use. Stainless rings have slightly lower spring force than spring steel - verify the axial load before substituting. See our SS 304 vs SS 316 guide for grade selection.
Ordering - What to Specify
- Standard: DIN 471 (or IS 3075)
- Nominal size: shaft diameter in mm, e.g. DIN 471-25
- Material: spring steel (standard), SS 304, or SS 316
- Quantity
Need DIN 471 Circlips?
Chart sizes up to Ø200 stocked ex-Mumbai in spring steel, with SS 304/316 options; Ø205-Ø300 on order. Same-week dispatch, pan-India delivery.
View Circlip RangeFrequently Asked Questions
What size DIN 471 circlip do I need for a 25 mm shaft?
For a 25 mm shaft you need a DIN 471-25 circlip: ring thickness 1.2 mm, groove diameter 23.9 mm (tolerance h11), minimum groove width 1.3 mm, groove depth 0.55 mm per side. The nominal circlip size always equals the shaft diameter, not the groove diameter.
What tolerance is a DIN 471 groove machined to?
The groove diameter d₂ on the shaft is machined to tolerance h11. The groove width must not be smaller than the minimum width m listed in the chart - the groove must accept the ring thickness s with running clearance. Incorrect groove dimensions are the leading cause of circlip failure in service.
Is IS 3075 the same as DIN 471?
IS 3075 is the Indian Standard for circlips for shafts and is equivalent to DIN 471. Standard sizes are dimensionally compatible, so a DIN 471-25 and an IS 3075 25 mm external circlip are interchangeable in most applications.
Do you stock DIN 471 circlips in stainless steel?
Yes. Standard DIN 471 circlips are spring steel (phosphated). SS 304 external circlips are stocked ex-Mumbai in common sizes, and SS 316 is available on request for marine and chemical environments. Note that stainless circlips have slightly lower spring force than spring steel - verify the axial load when substituting.