DISC SPRING : SYMBOLS & UNITS

Symbols and Units : Standard sizes available as per DIN 2093

Group Classification of Disc springs

Disc spring

In accordance with DIN 2093 Standard, Disc Springs are classified into 3 groups as given in the table:

Symbols and Units
Group

 Thickness of
 single disc
 in mm

Single disc with Ground ends & reduced material
thickness (t')
1 less than 1.25 No
2 From 1.25 to 6 No
3 Over 6 upto 14 Yes









Symbol

 Unit

 Term
De mm Outside diameter
Di mm Inside diameter
Do mm Mean diameter
E N/mm2 Modulus of elasticity
F N Spring load of a single disc
(with or without front ends)
ho mm Formed height
lo mm Free overall height of spring in its initial position
s mm Deflection of single disc
t mm Thickness of single disc
t1 mm Reduced thickness of single disc in the case of springs with ground ends (group 3)
µ   Poisson's ratio

δOM,ol,oil,
δIII, &δIV,

 N/mm2 Design stresses at the points designated OM, I, II, III, and IV
(see figure)
▲F N Relaxation

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