Symbol – Description
a – Radial width of the eye
b – Radial width of the retaining ring opposite the opening
c – Distance of the measuring plates during the conicity test
d₁ – Bore diameter
d₂ – Groove diameter
d₃ – Outer diameter of the retaining ring in the unstressed state
d₄ – Smallest coaxial diameter of the installation space during assembly calculated as: d₄ = d₁ − 2.1 a
d₅ – Diameter of mounting holes

E – Modulus of elasticity
F – Load on the retaining ring for shielding test
Fₙ – Load capacity of the groove at a yield strength of the grooved material of 200 MPa
Fᵣ – Load capacity of the retaining ring with sharp-edged contact of the pressing part
Fᵣg – Load capacity of the retaining ring with edge distance g
g – Edge distance of the part in contact with the retaining ring
h – Distance of the plates during shielding test
m – Groove width

n – Shoulder width
RₑL – Yield strength
r – Rounding in the groove bottom or at the test jaw
s – Thickness of the retaining ring
t – Groove depth at nominal size of d₁ and d₂