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)


Circlip Type
Shaft Diameter (d1)


External Circlips - Metric DIN 471
Parameter Symbol Value Unit
Nominal Shaft Diameter d1 --- mm
Clip Thickness of the Circlip s ---
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)Note 1
b ≈ ---
Diameter of Lug Holes d5_min ---
Weight of 1000 pieces w ≈ --- kg
Groove 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 ---
Data Note 2
Maximum Symmetrical Diameter of
Bore during Fitting
d4 ---
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