This standard applies to compression and extension springs of class II, category 2 with forces at maximum spring deformation (F3) from 1,
GOST 13771-1986 Referenced Document
GOST 1071-1981 Heat-treated steel spring wire. Specifications
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