This standard applies to compression springs of class III, category 1 with forces at maximum spring deformation (F3) from 12.5 to 1000 N
GOST 13774-1986 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