This standard applies to compression springs of class III, category 3 with forces at maximum spring deformation from 6000 to 20000 N
GOST 13776-1986 Referenced Document
GOST 13764-1986 Cylindrical helical compression (tension) springs made of round steel. Classification
GOST 13765-1986 Cylindrical helical compression (tension) springs made of round steel. Designation of parameters, methods for determination of dimensions