External circlips are retaining rings for holding structural parts (e.g. rolling bearings) on shafts. Circlips are fitted with spring retention in grooves and are suitable for the transmission of axial forces.

Metric external circlip dimensions are shown in the following chart according to the DIN 471 standard.

Some important notes from the DIN 471 standard:

- Material: C 67 , C 75 or Ck 75 spring steel in accordance with DIN 17222.

- Finish: Circlips must be without burr. Circlips are normally supplied corrosion-proof. Details are given in DIN 471.

- Designation: Shaft diameter (nominal dimension) and circlip thickness s (Ex: Circlip DIN 471 - 40 x 1,75)

External Circlip Dimensions for Shafts (Metric):

Circlip Type
Shaft Diameter (d1)


External Circlips - Metric DIN 471
Parameter Value
Nominal Shaft Diameter [d1] --- mm
Thickness of the Circlip [s] --- mm
Thickness Upper Deviation [sup_dev] ---
Thickness Lower Deviation [Slow_dev] ---
Internal Diameter of Circlip (Not under tension) [d3] ---
Internal Diameter Upper Deviation [d3_up_dev] ---
Internal Diameter Lower Deviation [d3_low_dev] ---
Maximum Radial Width of the Lug [amax] ---
Beam (Radial Width of Circlip Opposite the Aperture) [b ≈] Note 1 ---
Diameter of Lug Holes [d5_min] ---
Weight of 1000 pieces [w ≈] --- kg
Groove Diameter [d2] --- mm
Groove Diameter Upper Deviation [d2_up_dev ] ---
Groove Diameter Lower Deviation [d2_low_dev] ---
Groove Width [m] ---
Groove Depth with Nominal Sizes of d1 and d2 [t] ---
Minimum Edge Margin [nmin] ---
Supplementary Data Note 2
Maximum Symmetrical Diameter of Bore during Fitting [d4] --- mm
Load-bearing Capacity of Groove at a Yield Point of the Grooved Material of 200 MPa [FN] --- kN
Load-bearing Capacity of Circlip with Sharp-edged Abutment of the Pressing Part [FR] ---
Edge Chamfering Distance of the Abutment Surface to the Circlip [g] --- mm
Load-bearing Capacity of Circlip for Abutment with Edge Chamfering Distance g [FRg] --- kN
Detachment Speed of the Circlip [nabl] --- min-1
Nominal Size of Pliers according to DIN 5254 --- ---

Note 1 : Dimension b shall not exceed dimension a max.

Note 2 : Supplementary data is applicable only to circlips in spring steel in accordance with DIN 17222.

Note 3 : The load-bearing capacities (FN, FR, FRg) contain no safety against yielding under static stress nor against fatigue fracture under fluctuating stress.

Note 4 : Details of load-bearing capacities calculation for different parameters are given in DIN 471.


  • DIN 471 , Circlips (retaining rings) for shafts - Normal type and heavy type