Disc Spring Symbols & Units

Symbols and Units : Standard sizes available as per DIN 2093

Group Classification of Disc springs

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

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

Symbols and Units

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