This standard applies to compression springs of class II, category 4 with forces at maximum spring deformation (F3) from 4500 to 280000 N
GOST 13773-1986 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